PRECAUTIONS SECTION.

PRECAUTIONS. General The safe and effective use of local anesthetics depends on proper dosage, correct technique, adequate precautions and readiness for emergencies. Resuscitative equipment, oxygen and other resuscitative drugs should be available for immediate use (see WARNINGS and ADVERSE REACTIONS ). The lowest dosage that results in effective anesthesia should be used to avoid high plasma levels and serious adverse events. Injections should be made slowly and incrementally, with frequent aspirations before and during the injection to avoid intravascular injection. When continuous catheter technique is used, syringe aspirations should also be performed before and during each supplemental injection. During the administration of epidural anesthesia, it is recommended that test dose of local anesthetic with fast onset be administered initially and that the patient be monitored for central nervous system and cardiovascular toxicity, as well as for signs of unintended intrathecal administration before proceeding. When clinical conditions permit, consideration should be given to employing local anesthetic solutions, which contain epinephrine for the test dose because circulatory changes compatible with epinephrine may also serve as warning sign of unintended intravascular injection. An intravascular injection is still possible even if aspirations for blood are negative. Administration of higher than recommended doses of ropivacaine to achieve greater motor blockade or increased duration of sensory blockade may result in cardiovascular depression, particularly in the event of inadvertent intravascular injection. Tolerance to elevated blood levels varies with the physical condition of the patient. Debilitated, elderly patients and acutely ill patients should be given reduced doses commensurate with their age and physical condition. Local anesthetics should also be used with caution in patients with hypotension, hypovolemia or heart block. Careful and constant monitoring of cardiovascular and respiratory vital signs (adequacy of ventilation) and the patients state of consciousness should be performed after each local anesthetic injection. It should be kept in mind at such times that restlessness, anxiety, incoherent speech, light-headedness, numbness and tingling of the mouth and lips, metallic taste, tinnitus, dizziness, blurred vision, tremors, twitching, depression, or drowsiness may be early warning signs of central nervous system toxicity. Because amide-type local anesthetics such as ropivacaine are metabolized by the liver, these drugs, especially repeat doses, should be used cautiously in patients with hepatic disease. Patients with severe hepatic disease, because of their inability to metabolize local anesthetics normally, are at greater risk of developing toxic plasma concentrations. Local anesthetics should also be used with caution in patients with impaired cardiovascular function because they may be less able to compensate for functional changes associated with the prolongation of A-V conduction produced by these drugs. Many drugs used during the conduct of anesthesia are considered potential triggering agents for malignant hyperthermia (MH). Amide-type local anesthetics are not known to trigger this reaction. However, since the need for supplemental general anesthesia cannot be predicted in advance, it is suggested that standard protocol for MH management should be available. Epidural Anesthesia During epidural administration, ropivacaine HCl should be administered in incremental doses of to mL with sufficient time between doses to detect toxic manifestations of unintentional intravascular or intrathecal injection. Syringe aspirations should also be performed before and during each supplemental injection in continuous (intermittent) catheter techniques. An intravascular injection is still possible even if aspirations for blood are negative. During the administration of epidural anesthesia, it is recommended that test dose be administered initially and the effects monitored before the full dose is given. When clinical conditions permit, the test dose should contain an appropriate dose of epinephrine to serve as warning of unintentional intravascular injection. If injected into blood vessel, this amount of epinephrine is likely to produce transient epinephrine response within 45 seconds, consisting of an increase in heart rate and systolic blood pressure, circumoral pallor, palpitations and nervousness in the unsedated patient. The sedated patient may exhibit only pulse rate increase of 20 or more beats per minute for 15 or more seconds. Therefore, following the test dose, the heart should be continuously monitored for heart rate increase. Patients on beta-blockers may not manifest changes in heart rate, but blood pressure monitoring can detect rise in systolic blood pressure. test dose of short-acting amide anesthetic such as lidocaine is recommended to detect an unintentional intrathecal administration. This will be manifested within few minutes by signs of spinal block (e.g., decreased sensation of the buttocks, paresis of the legs, or, in the sedated patient, absent knee jerk). An intravascular or subarachnoid injection is still possible even if results of the test dose are negative. The test dose itself may produce systemic toxic reaction, high spinal or epinephrine-induced cardiovascular effects. Use in Brachial Plexus Block Ropivacaine plasma concentrations may approach the threshold for central nervous system toxicity after the administration of 300 mg of ropivacaine for brachial plexus block. Caution should be exercised when using the 300 mg dose (see OVERDOSAGE). The dose for major nerve block must be adjusted according to the site of administration and patient status. Supraclavicular brachial plexus blocks may be associated with higher frequency of serious adverse reactions, regardless of the local anesthetic used. Use in Peripheral Nerve Block Major peripheral nerve blocks may result in the administration of large volume of local anesthetic in highly vascularized areas, often close to large vessels where there is an increased risk of intravascular injection and/or rapid systemic absorption, which can lead to high plasma concentrations. Use in Head and Neck Area Small doses of local anesthetics injected into the head and neck area may produce adverse reactions similar to systemic toxicity seen with unintentional intravascular injections of larger doses. The injection procedures require the utmost care. Confusion, convulsions, respiratory depression, and/or respiratory arrest, and cardiovascular stimulation or depression have been reported. These reactions may be due to intra-arterial injection of the local anesthetic with retrograde flow to the cerebral circulation. Patients receiving these blocks should have their circulation and respiration monitored and be constantly observed. Resuscitative equipment and personnel for treating adverse reactions should be immediately available. Dosage recommendations should not be exceeded (see DOSAGE AND ADMINISTRATION). Use in Ophthalmic Surgery The use of ropivacaine in retrobulbar blocks for ophthalmic surgery has not been studied. Until appropriate experience is gained, the use of ropivacaine for such surgery is not recommended. Information for Patients When appropriate, patients should be informed in advance that they may experience temporary loss of sensation and motor activity in the anesthetized part of the body following proper administration of lumbar epidural anesthesia. Also, when appropriate, the physician should discuss other information including adverse reactions in the ropivacaine package insert. Inform patients that use of local anesthetics may cause methemoglobinemia, serious condition that must be treated promptly. Advise patients or caregivers to seek immediate medical attention if they or someone in their care experience the following signs or symptoms: pale, gray, or blue colored skin (cyanosis); headache; rapid heart rate; shortness of breath; light-headedness; or fatigue.. Drug Interactions Specific trials studying the interaction between ropivacaine and class III antiarrhythmic drugs (e.g., amiodarone) have not been performed, but caution is advised (see WARNINGS). Ropivacaine should be used with caution in patients receiving other local anesthetics or agents structurally related to amide-type local anesthetics, since the toxic effects of these drugs are additive. Cytochrome P4501A2 is involved in the formation of 3-hydroxy ropivacaine, the major metabolite. In vivo, the plasma clearance of ropivacaine was reduced by 70% during coadministration of fluvoxamine (25 mg bid for days), selective and potent CYP1A2 inhibitor. Thus strong inhibitors of cytochrome P4501A2, such as fluvoxamine, given concomitantly during administration of ropivacaine, can interact with ropivacaine leading to increased ropivacaine plasma levels. Caution should be exercised when CYP1A2 inhibitors are coadministered. Possible interactions with drugs known to be metabolized by CYP1A2 via competitive inhibition such as theophylline and imipramine may also occur. Coadministration of selective and potent inhibitor of CYP3A4, ketoconazole (100 mg bid for days with ropivacaine infusion administered hour after ketoconazole) caused 15% reduction in in vivo plasma clearance of ropivacaine. Patients who are administered local anesthetics are at increased risk of developing methemoglobinemia when concurrently exposed to the following drugs, which could include other local anesthetics:Examples of Drugs Associated with Methemoglobinemia:ClassExamplesNitrates/Nitritesnitric oxide, nitroglycerin, nitroprusside, nitrous oxideLocal anestheticsarticaine, benzocaine, bupivacaine, lidocaine, mepivacaine, prilocaine, procaine, ropivacaine, tetracaineAntineoplastic agentscyclophosphamide, flutamide, hydroxyurea, ifosfamide, rasburicaseAntibioticsdapsone, nitrofurantoin, para-aminosalicylic acid, sulfonamidesAntimalarialschloroquine, primaquineAnticonvulsantsphenobarbital, phenytoin, sodium valproateOther drugsacetaminophen, metoclopramide, quinine, sulfasalazine. Carcinogenesis, Mutagenesis, Impairment of Fertility Long-term studies in animals of most local anesthetics, including ropivacaine, to evaluate the carcinogenic potential have not been conducted. Weak mutagenic activity was seen in the mouse lymphoma test. Mutagenicity was not noted in the other assays, demonstrating that the weak signs of in vitro activity in the mouse lymphoma test were not manifest under diverse in vivo conditions. Studies performed with ropivacaine in rats did not demonstrate an effect on fertility or general reproductive performance over generations. Reproduction toxicity studies have been performed in pregnant New Zealand white rabbits and Sprague-Dawley rats. During gestation days to 18, rabbits received 1.3, 4.2, or 13 mg/kg/day subcutaneously. In rats, subcutaneous doses of 5.3, 11 and 26 mg/kg/day were administered during gestation days to 15. No teratogenic effects were observed in rats and rabbits at the highest doses tested. The highest doses of 13 mg/kg/day (rabbits) and 26 mg/kg/day (rats) are approximately 1/3 of the maximum recommended human dose (epidural, 770 mg/24 hours) based on mg/m2 basis. In prenatal and postnatal studies, the female rats were dosed daily from day 15 of gestation to day 20 postpartum. The doses were 5.3, 11 and 26 mg/kg/day subcutaneously. There were no treatment-related effects on late fetal development, parturition, lactation, neonatal viability, or growth of the offspring. In another study with rats, the males were dosed daily for weeks before mating and during mating. The females were dosed daily for weeks before mating and then during the mating, pregnancy, and lactation, up to day 42 post coitus. At 23 mg/kg/day, an increased loss of pups was observed during the first days postpartum. The effect was considered secondary to impaired maternal care due to maternal toxicity. There are no adequate or well-controlled studies in pregnant women of the effects of ropivacaine on the developing fetus. Ropivacaine should only be used during pregnancy if the benefits outweigh the risk.Teratogenicity studies in rats and rabbits did not show evidence of any adverse effects on organogenesis or early fetal development in rats (26 mg/kg sc) or rabbits (13 mg/kg). The doses used were approximately equal to total daily dose based on body surface area. There were no treatment-related effects on late fetal development, parturition, lactation, neonatal viability, or growth of the offspring in perinatal and postnatal studies in rats, at dose levels equivalent to the maximum recommended human dose based on body surface area. In another study at 23 mg/kg, an increased pup loss was seen during the first days postpartum, which was considered secondary to impaired maternal care due to maternal toxicity. Labor and Delivery Local anesthetics, including ropivacaine, rapidly cross the placenta, and when used for epidural block can cause varying degrees of maternal, fetal and neonatal toxicity (see CLINICAL PHARMACOLOGY and PHARMACOKINETICS). The incidence and degree of toxicity depend upon the procedure performed, the type and amount of drug used, and the technique of drug administration. Adverse reactions in the parturient, fetus and neonate involve alterations of the central nervous system, peripheral vascular tone and cardiac function. Maternal hypotension has resulted from regional anesthesia with ropivacaine for obstetrical pain relief. Local anesthetics produce vasodilation by blocking sympathetic nerves. Elevating the patients legs and positioning her on her left side will help prevent decreases in blood pressure. The fetal heart rate also should be monitored continuously, and electronic fetal monitoring is highly advisable. Epidural anesthesia has been reported to prolong the second stage of labor by removing the patients reflex urge to bear down or by interfering with motor function. Spontaneous vertex delivery occurred more frequently in patients receiving ropivacaine than in those receiving bupivacaine. Nursing Mothers Some local anesthetic drugs are excreted in human milk and caution should be exercised when they are administered to nursing woman. The excretion of ropivacaine or its metabolites in human milk has not been studied. Based on the milk/plasma concentration ratio in rats, the estimated daily dose to pup will be about 4% of the dose given to the mother. Assuming that the milk/plasma concentration in humans is of the same order, the total ropivacaine dose to which the baby is exposed by breast-feeding is far lower than by exposure in utero in pregnant women at term (see PRECAUTIONS). Pediatric Use The safety and efficacy of ropivacaine in pediatric patients have not been established. Geriatric Use Of the 2,978 subjects that were administered ropivacaine injection in 71 controlled and uncontrolled clinical studies, 803 patients (27%) were 65 years of age or older which includes 127 patients (4%) 75 years of age and over. Ropivacaine injection was found to be safe and effective in the patients in these studies. Clinical data in one published article indicate that differences in various pharmacodynamic measures were observed with increasing age. In one study, the upper level of analgesia increased with age, the maximum decrease of MAP declined with age during the first hour after epidural administration, and the intensity of motor blockade increased with age.This drug and its metabolites are known to be excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function. Elderly patients are more likely to have decreased hepatic, renal, or cardiac function, as well as concomitant disease. Therefore, care should be taken in dose selection, starting at the low end of the dosage range, and it may be useful to monitor renal function (see PHARMACOKINETICS, Elimination).

WARNINGS SECTION.

WARNINGS. In performing ropivacaine blocks, unintended intravenous injection is possible and may result in cardiac arrhythmia or cardiac arrest. The potential for successful resuscitation has not been studied in humans. There have been rare reports of cardiac arrest during the use of ropivacaine for epidural anesthesia or peripheral nerve blockade, the majority of which occurred after unintentional accidental intravascular administration in elderly patients and in patients with concomitant heart disease. In some instances, resuscitation has been difficult. Should cardiac arrest occur, prolonged resuscitative efforts may be required to improve the probability of successful outcome. Ropivacaine should be administered in incremental doses. It is not recommended for emergency situations, where fast onset of surgical anesthesia is necessary. Historically, pregnant patients were reported to have high risk for cardiac arrhythmias, cardiac/circulatory arrest and death when 0.75% bupivacaine (another member of the amino amide class of local anesthetics) was inadvertently rapidly injected intravenously. Prior to receiving major blocks the general condition of the patient should be optimized and the patient should have an IV line inserted. All necessary precautions should be taken to avoid intravascular injection. Local anesthetics should only be administered by clinicians who are well versed in the diagnosis and management of dose-related toxicity and other acute emergencies which might arise from the block to be employed, and then only after ensuring the immediate (without delay) availability of oxygen, other resuscitative drugs, cardiopulmonary resuscitative equipment, and the personnel resources needed for proper management of toxic reactions and related emergencies (see also ADVERSE REACTIONS, PRECAUTIONS and MANAGEMENT OF LOCAL ANESTHETIC EMERGENCIES). Delay in proper management of dose-related toxicity, underventilation from any cause, and/or altered sensitivity may lead to the development of acidosis, cardiac arrest and, possibly, death. Solutions of ropivacaine should not be used for the production of obstetrical paracervical block anesthesia, retrobulbar block, or spinal anesthesia (subarachnoid block) due to insufficient data to support such use. Intravenous regional anesthesia (bier block) should not be performed due to lack of clinical experience and the risk of attaining toxic blood levels of ropivacaine.Intra-articular infusions of local anesthetics following arthroscopic and other surgical procedures is an unapproved use, and there have been post-marketing reports of chondrolysis in patients receiving such infusions. The majority of reported cases of chondrolysis have involved the shoulder joint; cases of gleno-humeral chondrolysis have been described in pediatric and adult patients following intra-articular infusions of local anesthetics with and without epinephrine for periods of 48 to 72 hours. There is insufficient information to determine whether shorter infusion periods are not associated with these findings. The time of onset of symptoms, such as joint pain, stiffness and loss of motion can be variable, but may begin as early as the 2nd month after surgery. Currently, there is no effective treatment for chondrolysis; patients who experienced chondrolysis have required additional diagnostic and therapeutic procedures and some required arthroplasty or shoulder replacement.It is essential that aspiration for blood, or cerebrospinal fluid (where applicable), be done prior to injecting any local anesthetic, both the original dose and all subsequent doses, to avoid intravascular or subarachnoid injection. However, negative aspiration does not ensure against an intravascular or subarachnoid injection. well-known risk of epidural anesthesia may be an unintentional subarachnoid injection of local anesthetic. Two clinical studies have been performed to verify the safety of ropivacaine HCl at volume of mL injected into the subarachnoid space since this dose represents an incremental epidural volume that could be unintentionally injected. The 15 and 22.5 mg doses injected resulted in sensory levels as high as T5 and T4, respectively. Anesthesia to pinprick started in the sacral dermatomes in to minutes, extended to the T10 level in 10 to 13 minutes and lasted for approximately hours. The results of these two clinical studies showed that 3 mL dose did not produce any serious adverse events when spinal anesthesia blockade was achieved. Ropivacaine should be used with caution in patients receiving other local anesthetics or agents structurally related to amide-type local anesthetics, since the toxic effects of these drugs are additive. Patients treated with class III antiarrhythmic drugs (e.g., amiodarone) should be under close surveillance and ECG monitoring considered, since cardiac effects may be additive. Methemoglobinemia. Cases of methemoglobinemia have been reported in association with local anesthetic use. Although all patients are at risk for methemoglobinemia, patients with glucose-6- phosphate dehydrogenase deficiency, congenital or idiopathic methemoglobinemia, cardiac or pulmonary compromise, infants under months of age, and concurrent exposure to oxidizing agents or their metabolites are more susceptible to developing clinical manifestations of the condition. If local anesthetics must be used in these patients, close monitoring for symptoms and signs of methemoglobinemia is recommended.Signs of methemoglobinemia may occur immediately or may be delayed some hours after exposure, and are characterized by cyanotic skin discoloration and/or abnormal coloration of the blood. Methemoglobin levels may continue to rise; therefore, immediate treatment is required to avert more serious central nervous system and cardiovascular adverse effects, including seizures, coma, arrhythmias, and death.Discontinue ropivacaine and any other oxidizing agents. Depending on the severity of the signs and symptoms, patients may respond to supportive care, i.e., oxygen therapy, hydration. more severe clinical presentation may require treatment with methylene blue, exchange transfusion, or hyperbaric oxygen.

ADVERSE REACTIONS SECTION.

ADVERSE REACTIONS. Reactions to ropivacaine are characteristic of those associated with other amide-type local anesthetics. major cause of adverse reactions to this group of drugs may be associated with excessive plasma levels, which may be due to overdosage, unintentional intravascular injection or slow metabolic degradation. The reported adverse events are derived from clinical studies conducted in the U.S. and other countries. The reference drug was usually bupivacaine. The studies used variety of premedications, sedatives, and surgical procedures of varying length. total of 3,988 patients have been exposed to ropivacaine at concentrations up to 1% in clinical trials. Each patient was counted once for each type of adverse event. Incidence >=5% For the indications of epidural administration in surgery, cesarean section, postoperative pain management, peripheral nerve block, and local infiltration, the following treatment-emergent adverse events were reported with an incidence of >= 5% in all clinical studies (N=3988): hypotension (37%), nausea (24.8%), vomiting (11.6%), bradycardia (9.3%), fever (9.2%), pain (8%), postoperative complications (7.1%), anemia (6.1%), paresthesia (5.6%), headache (5.1%), pruritus (5.1%), and back pain (5%). Incidence to 5% Urinary retention, dizziness, rigors, hypertension, tachycardia, anxiety, oliguria, hypoesthesia, chest pain, hypokalemia, dyspnea, cramps, and urinary tract infection. Incidence in Controlled Clinical Trials The reported adverse events are derived from controlled clinical studies with ropivacaine (concentrations ranged from 0.125% to 1% for ropivacaine HCl and 0.25% to 0.75% for bupivacaine) in the U.S. and other countries involving 3,094 patients. Table 3A and 3B list adverse events (number and percentage) that occurred in at least 1% of ropivacaine-treated patients in these studies. The majority of patients receiving concentrations higher than mg/mL (0.5%) were treated with ropivacaine HCl. Table 3A Adverse Events Reported in >=1% of Adult Patients Receiving Regional or Local Anesthesia (Surgery, Labor, Cesarean Section, Postoperative Pain Management, Peripheral Nerve Block and Local Infiltration)Adverse ReactionRopivacainetotal N=1661Bupivacainetotal N=1433N(%)N(%)Hypotension536(32.3)408(28.5)Nausea283(17)207(14.4)VomitingBradycardia11796(7)(5.8)8873(6.1)(5.1)Headache84(5.1)68(4.7)Paresthesia82(4.9)57(4)Back pain73(4.4)75(5.2)Pain71(4.3)71(5)Pruritus63(3.8)40(2.8)Fever61(3.7)37(2.6)Dizziness42(2.5)23(1.6)Rigors (Chills)42(2.5)24(1.7)Postoperative complications41(2.5)44(3.1)Hypoesthesia27(1.6)24(1.7)Urinary retention23(1.4)20(1.4)Progression of labor poor/failed23(1.4)22(1.5)Anxiety21(1.3)11(0.8)Breast disorder, breast-feeding21(1.3)12(0.8)Rhinitis18(1.1)13(0.9) Table 3B Adverse Events Reported in >=1% of Fetuses or Neonates of Mothers Who Received Regional Anesthesia (Cesarean Section and Labor Studies)Adverse ReactionRopivacainetotal N=639Bupivacainetotal N=573N(%)N(%)Fetal bradycardia77(12.1)68(11.9)Neonatal jaundice49(7.7)47(8.2)Neonatal complication-NOS42(6.6)38(6.6)Apgar score low18(2.8)14(2.4)Neonatal respiratory disorder17(2.7)18(3.1)Neonatal tachypnea14(2.2)15(2.6)Neonatal fever13(2)14(2.4)Fetal tachycardia13(2)12(2.1)Fetal distress11(1.7)10(1.7)Neonatal infection10(1.6)8(1.4)Neonatal hypoglycemia8(1.3)16(2.8)Incidence <1% The following adverse events were reported during the ropivacaine clinical program in more than one patient (N 3988), occurred at an overall incidence of <1%, and were considered relevant: Application Site Reactions injection site pain Cardiovascular System vasovagal reaction, syncope, postural hypotension, non-specific ECG abnormalities Female Reproductive poor progression of labor, uterine atony Gastrointestinal System fecal incontinence, tenesmus, neonatal vomiting General and Other Disorders hypothermia, malaise, asthenia, accident and/or injury Hearing and Vestibular tinnitus, hearing abnormalities Heart Rate and Rhythm extrasystoles, non-specific arrhythmias, atrial fibrillation Liver and Biliary System jaundice Metabolic Disorders hypomagnesemia Musculoskeletal System myalgia Myo/Endo/Pericardium ST segment changes, myocardial infarction Nervous System tremor, Horners syndrome, paresis, dyskinesia, neuropathy, vertigo, coma, convulsion, hypokinesia, hypotonia, ptosis, stupor Psychiatric Disorders agitation, confusion, somnolence, nervousness, amnesia, hallucination, emotional lability, insomnia, nightmares Respiratory System bronchospasm, coughing Skin Disorders rash, urticaria Urinary System Disorders urinary incontinence, micturition disorder Vascular deep vein thrombosis, phlebitis, pulmonary embolism Vision vision abnormalities For the indication epidural anesthesia for surgery, the 15 most common adverse events were compared between different concentrations of ropivacaine and bupivacaine. Table is based on data from trials in the U.S. and other countries where ropivacaine was administered as an epidural anesthetic for surgery.Table Common Events (Epidural Administration)Adverse ReactionRopivacaineBupivacaine5 mg/mLtotal = 2567.5 mg/mLtotal = 29710 mg/mLtotal = 2075 mg/mLtotal = 2367.5 mg/mLtotal = 174N(%)N(%)N(%)N(%)N(%)Hypotension 99(38.7)146(49.2)113(54.6)91(38.6)89(51.1)Nausea 34(13.3)68(22.9) 41(17.4)36(20.7)Bradycardia 29(11.3)58(19.5)40(19.3)32(13.6)25(14.4)Back pain 18(7)23(7.7)34(16.4)21(8.9)23(13.2)Vomiting 18(7)33(11.1)23(11.1)19(8.1)14(8)Headache 12(4.7)20(6.7)16(7.7)13(5.5)9(5.2)Fever 8(3.1)5(1.7)18(8.7)11(4.7) Chills6(2.3)7(2.4)6(2.9)4(1.7)3(1.7)Urinary retention5(2)8(2.7)10(4.8)10(4.2) Paresthesia5(2)10(3.4)5(2.4)7(3) Pruritus 14(4.7)3(1.4) 7(4)Using data from the same studies, the number (%) of patients experiencing hypotension is displayed by patient age, drug and concentration in Table 5. In Table 6, the adverse events for ropivacaine are broken down by gender. Table Effects of Age on Hypotension (Epidural Administration) Total N: Ropivacaine 760, Bupivacaine 410Ropivacaine BupivacaineAge5 mg/mL7.5 mg/mL10 mg/mL5 mg/mL7.5 mg/mL<65>=65N6831(%)(32.2)(68.9)N9947(%)(43.2)(69.1)N8726(%)(51.5)(68.4)N6427(%)(33.5)(60)N7316(%)(48.3)(69.6) Table Most Common Adverse Events by Gender (Epidural Administration) Total N: Females 405, Males 355Adverse ReactionFEMALEMALEN(%)N(%)HypotensionNauseaBradycardiaVomitingBack painHeadacheChillsFeverPruritusPainUrinary retentionDizziness HypoesthesiaParesthesia220119655941331816161211988(54.3)(29.4)(16)(14.6)(10.1)(8.1)(4.4)(4)(4)(3)(2.7)(2.2)(2)(2)138235682317531474210(38.9)(6.5)(15.8)(2.3)(6.5)(4.8)(1.4)(0.8)(0.3)(1.1)(2)(1.1)(0.6)(2.8)Systemic Reactions The most commonly encountered acute adverse experiences that demand immediate countermeasures are related to the central nervous system and the cardiovascular system. These adverse experiences are generally dose-related and due to high plasma levels that may result from overdosage, rapid absorption from the injection site, diminished tolerance or from unintentional intravascular injection of the local anesthetic solution. In addition to systemic dose-related toxicity, unintentional subarachnoid injection of drug during the intended performance of lumbar epidural block or nerve blocks near the vertebral column (especially in the head and neck region) may result in underventilation or apnea (Total or High Spinal). Also, hypotension due to loss of sympathetic tone and respiratory paralysis or underventilation due to cephalad extension of the motor level of anesthesia may occur. This may lead to secondary cardiac arrest if untreated. Factors influencing plasma protein binding, such as acidosis, systemic diseases that alter protein production or competition with other drugs for protein binding sites, may diminish individual tolerance. Epidural administration of ropivacaine has, in some cases, as with other local anesthetics, been associated with transient increases in temperature to 38.5C. This occurred more frequently at doses of ropivacaine HCl 16 mg/h.Neurologic Reactions These are characterized by excitation and/or depression. Restlessness, anxiety, dizziness, tinnitus, blurred vision or tremors may occur, possibly proceeding to convulsions. However, exctextent may be transient or absent, with depression being the first manifestation of an adverse reaction. This may quickly be followed by drowsiness merging into unconsciousness and respiratory arrest. Other central nervous system effects may be nausea, vomiting, chills, and constriction of the pupils. The incidence of convulsions associated with the use of local anesthetics varies with the route of administration and the total dose administered. In survey of studies of epidural anesthesia, overt toxicity progressing to convulsions occurred in approximately 0.1% of local anesthetic administrations. The incidence of adverse neurological reactions associated with the use of local anesthetics may be related to the total dose and concentration of local anesthetic administered and are also dependent upon the particular drug used, the route of administration, and the physical status of the patient. Many of these observations may be related to local anesthetic techniques, with or without contribution from the drug. During lumbar epidural block, occasional unintentional penetration of the subarachnoid space by the catheter or needle may occur. Subsequent adverse effects may depend partially on the amount of drug administered intrathecally as well as the physiological and physical effects of dural puncture. These observations may include spinal block of varying magnitude (including high or total spinal block), hypotension secondary to spinal block, urinary retention, loss of bladder and bowel control (fecal and urinary incontinence), and loss of perineal sensation and sexual function. Signs and symptoms of subarachnoid block typically start within to minutes of injection. Doses of 15 and 22.5 mg of ropivacaine HCl resulted in sensory levels as high as T5 and T4, respectively. Analgesia started in the sacral dermatomes in to minutes and extended to the T10 level in 10 to 13 minutes and lasted for approximately hours. Other neurological effects following unintentional subarachnoid administration during epidural anesthesia may include persistent anesthesia, paresthesia, weakness, paralysis of the lower extremities, and loss of sphincter control; all of which may have slow, incomplete or no recovery. Headache, septic meningitis, meningismus, slowing of labor, increased incidence of forceps delivery, or cranial nerve palsies due to traction on nerves from loss of cerebrospinal fluid have been reported (see DOSAGE AND ADMINISTRATION discussion of Lumbar Epidural Block). high spinal is characterized by paralysis of the arms, loss of consciousness, respiratory paralysis and bradycardia. Cardiovascular System Reactions High doses or unintentional intravascular injection may lead to high plasma levels and related depression of the myocardium, decreased cardiac output, heart block, hypotension, bradycardia, ventricular arrhythmias, including ventricular tachycardia and ventricular fibrillation, and possibly cardiac arrest (see WARNINGS, PRECAUTIONS, and OVERDOSAGE). Allergic Reactions Allergic type reactions are rare and may occur as result of sensitivity to the local anesthetic (see WARNINGS). These reactions are characterized by signs such as urticaria, pruritus, erythema, angioneurotic edema (including laryngeal edema), tachycardia, sneezing, nausea, vomiting, dizziness, syncope, excessive sweating, elevated temperature, and possibly, anaphylactoid symptomatology (including severe hypotension). Cross-sensitivity among members of the amide-type local anesthetic group has been reported. The usefulness of screening for sensitivity has not been definitively established.

CLINICAL PHARMACOLOGY SECTION.

CLINICAL PHARMACOLOGY. Mechanism of Action Ropivacaine is member of the amino amide class of local anesthetics and is supplied as the pure S-(-)-enantiomer. Local anesthetics block the generation and the conduction of nerve impulses, presumably by increasing the threshold for electrical excitation in the nerve, by slowing the propagation of the nerve impulse, and by reducing the rate of rise of the action potential. In general, the progression of anesthesia is related to the diameter, myelination and conduction velocity of affected nerve fibers. Clinically, the order of loss of nerve function is as follows: (1) pain, (2) temperature, (3) touch, (4) proprioception, and (5) skeletal muscle tone. Pharmacokinetics Absorption The systemic concentration of ropivacaine is dependent on the total dose and concentration of drug administered, the route of administration, the patients hemodynamic/circulatory condition, and the vascularity of the administration site. From the epidural space, ropivacaine shows complete and biphasic absorption. The half-lives of the phases, (mean +- SD) are 14 +- minutes and 4.2 +- 0.9 h, respectively. The slow absorption is the rate limiting factor in the elimination of ropivacaine that explains why the terminal half-life is longer after epidural than after intravenous administration. Ropivacaine shows dose-proportionality up to the highest intravenous dose studied, 80 mg, corresponding to mean +- SD peak plasma concentration of 1.9 +- 0.3 mcg/mL. Table Pharmacokinetic (plasma concentration-time) data from clinical trials Continuous 72 hour epidural infusion after an epidural block with or 10 mg/mL. Epidural anesthesia with 7.5 mg/mL (0.75%) for cesarean delivery. Brachial plexus block with 7.5 mg/mL (0.75%) ropivacaine. 20 minute IV infusion to volunteers (40 mg). Cmax measured at the end of infusion (i.e., at 72 hr). Cmax measured at the end of infusion (i.e., at 20 minutes). n/a=not applicable t1/2 is the true terminal elimination half-life. On the other hand, t1/2 follows absorption-dependent elimination (flip-flop) after non-intravenous administration.RouteEpidural InfusionEpidural InfusionEpidural Block+ Epidural Block+ PlexusBlock IVInfusion Dose (mg)1493+-102075+-2061217+-277150187.530040N121211881012Cmax (mg/L)2.4+-1 2.8+-0.5 2.3+-1.1 1.1+-0.21.6+-0.62.3+-0.81.2+-0.2 Tmax (min)n/a n/an/a43+-1434+-954+-22n/a AUC0- (mg.h/L)135.5+-50145+-34161+-907.2+-211.3+-413+-3.31.8+-0.6CL (L/h)11.0313.7n/a5.5+-25+-2.6n/a21.2+-7t1/2 (hr) 5+-2.55.7+-36+-35.7+-27.1+-36.8+-3.21.9+-0.5In some patients after 300 mg dose for brachial plexus block, free plasma concentrations of ropivacaine may approach the threshold for central nervous system (CNS) toxicity (see PRECAUTIONS). At dose of >300 mg, for local infiltration, the terminal half-life may be longer (> 30 hours).. Distribution After intravascular infusion, ropivacaine has steady-state volume of distribution of 41 +- liters. Ropivacaine is 94% protein bound, mainly to 1-acid glycoprotein. An increase in total plasma concentrations during continuous epidural infusion has been observed, related to postoperative increase of 1-acid glycoprotein. Variations in unbound, i.e., pharmacologically active, concentrations have been less than in total plasma concentration. Ropivacaine readily crosses the placenta and equilibrium in regard to unbound concentration will be rapidly reached (see PRECAUTIONS, Labor and Delivery).. Metabolism Ropivacaine is extensively metabolized in the liver, predominantly by aromatic hydroxylation mediated by cytochrome P4501A to 3-hydroxy ropivacaine. After single intravenous (IV) dose approximately 37% of the total dose is excreted in the urine as both free and conjugated 3-hydroxy ropivacaine. Low concentrations of 3-hydroxy ropivacaine have been found in the plasma. Urinary excretion of the 4-hydroxy ropivacaine, and both the 3-hydroxy N-de-alkylated (3-OH-PPX) and 4-hydroxy N-de-alkylated (4-OH-PPX) metabolites account for less than 3% of the dose. An additional metabolite, 2-hydroxy-methyl-ropivacaine, has been identified but not quantified in the urine. The N-de-alkylated metabolite of ropivacaine (PPX) and 3-OH-ropivacaine are the major metabolites excreted in the urine during epidural infusion. Total PPX concentration in the plasma was about half as that of total ropivacaine; however, mean unbound concentrations of PPX were about to times higher than that of unbound ropivacaine following continuous epidural infusion up to 72 hours. Unbound PPX, 3-hydroxy and 4-hydroxy ropivacaine, have pharmacological activity in animal models less than that of ropivacaine. There is no evidence of in vivo racemization in urine of ropivacaine.. Elimination The kidney is the main excretory organ for most local anesthetic metabolites. In total, 86% of the ropivacaine dose is excreted in the urine after intravenous administration of which only 1% relates to unchanged drug. After intravenous administration ropivacaine has mean +- SD total plasma clearance of 387 +- 107 mL/min, an unbound plasma clearance of 7.2 +- 1.6 L/min, and renal clearance of mL/min. The mean +- SD terminal half-life is 1.8 +- 0.7 after intravascular administration and 4.2 +- h after epidural administration (see Absorption).. Pharmacodynamics Studies in humans have demonstrated that, unlike most other local anesthetics, the presence of epinephrine has no major effect on either the time of onset or the duration of action of ropivacaine. Likewise, addition of epinephrine to ropivacaine has no effect on limiting systemic absorption of ropivacaine. Systemic absorption of local anesthetics can produce effects on the central nervous and cardiovascular systems. At blood concentrations achieved with therapeutic doses, changes in cardiac conduction, excitability, refractoriness, contractility, and peripheral vascular resistance have been reported. Toxic blood concentrations depress cardiac conduction and excitability, which may lead to atrioventricular block, ventricular arrhythmias and to cardiac arrest, sometimes resulting in fatalities. In addition, myocardial contractility is depressed and peripheral vasodilation occurs, leading to decreased cardiac output and arterial blood pressure. Following systemic absorption, local anesthetics can produce central nervous system stimulation, depression or both. Apparent central stimulation is usually manifested as restlessness, tremors and shivering, progressing to convulsions, followed by depression and coma, progressing ultimately to respiratory arrest. However, the local anesthetics have primary depressant effect on the medulla and on higher centers. The depressed stage may occur without prior excited stage. In clinical pharmacology studies (total n=24) ropivacaine and bupivacaine were infused (10 mg/min) in human volunteers until the appearance of CNS symptoms, e.g., visual or hearing disturbances, perioral numbness, tingling and others. Similar symptoms were seen with both drugs. In study, the mean +- SD maximum tolerated intravenous dose of ropivacaine infused (124 +- 38 mg) was significantly higher than that of bupivacaine (99 +- 30 mg) while in the other study the doses were not different (115 +- 29 mg of ropivacaine and 103 +- 30 mg of bupivacaine). In the latter study, the number of subjects reporting each symptom was similar for both drugs with the exception of muscle twitching which was reported by more subjects with bupivacaine than ropivacaine at comparable intravenous doses. At the end of the infusion, ropivacaine in both studies caused significantly less depression of cardiac conductivity (less QRS widening) than bupivacaine. Ropivacaine and bupivacaine caused evidence of depression of cardiac contractility, but there were no changes in cardiac output. Clinical data in one published article indicate that differences in various pharmacodynamic measures were observed with increasing age. In one study, the upper level of analgesia increased with age, the maximum decrease of mean arterial pressure (MAP) declined with age during the first hour after epidural administration, and the intensity of motor blockade increased with age. However, no pharmacokinetic differences were observed between elderly and younger patients. In non-clinical pharmacology studies comparing ropivacaine and bupivacaine in several animal species, the cardiac toxicity of ropivacaine was less than that of bupivacaine, although both were considerably more toxic than lidocaine. Arrhythmogenic and cardio-depressant effects were seen in animals at significantly higher doses of ropivacaine than bupivacaine. The incidence of successful resuscitation was not significantly different between the ropivacaine and bupivacaine groups. Clinical Trials. Ropivacaine was studied as local anesthetic both for surgical anesthesia and for acute pain management (see DOSAGE AND ADMINISTRATION). The onset, depth and duration of sensory block are, in general, similar to bupivacaine. However, the depth and duration of motor block, in general, are less than that with bupivacaine.Epidural Administration In Surgery There were 25 clinical studies performed in 900 patients to evaluate ropivacaine epidural injection for general surgery. Ropivacaine HCl was used in doses ranging from 75 to 250 mg. In doses of 100 to 200 mg, the median (1st to 3rd quartile) onset time to achieve T10 sensory block was 10 (5 to 13) minutes and the median (1st to 3rd quartile) duration at the T10 level was (3 to 5) hours (see DOSAGE AND ADMINISTRATION). Higher doses produced more profound block with greater duration of effect.Epidural Administration In Cesarean Section total of 12 studies were performed with epidural administration of ropivacaine for cesarean section. Eight of these studies involved 218 patients using the concentration of mg/mL (0.5%) in doses up to 150 mg. Median onset measured at T6 ranged from 11 to 26 minutes. Median duration of sensory block at T6 ranged from 1.7 to 3.2 h, and duration of motor block ranged from 1.4 to 2.9 h. Ropivacaine provided adequate muscle relaxation for surgery in all cases. In addition, active controlled studies for cesarean section were performed in 264 patients at concentration of 7.5 mg/mL (0.75%) in doses up to 187.5 mg. Median onset measured at T6 ranged from to 15 minutes. Seventy-seven to 96% of ropivacaine-exposed patients reported no pain at delivery. Some patients received other anesthetic, analgesic, or sedative modalities during the course of the operative procedure. Epidural Administration In Labor And Delivery total of double-blind clinical studies, involving 240 patients were performed to evaluate ropivacaine for epidural block for management of labor pain. When administered in doses up to 278 mg as intermittent injections or as continuous infusion, ropivacaine HCl produced adequate pain relief. prospective meta-analysis on of these studies provided detailed evaluation of the delivered newborns and showed no difference in clinical outcomes compared to bupivacaine. There were significantly fewer instrumental deliveries in mothers receiving ropivacaine as compared to bupivacaine. Table Labor And Delivery Meta-Analysis: Mode of DeliveryDelivery ModeRopivacaine n=199Bupivacaine n=188 Spontaneous Vertex Vacuum Extractor Forceps Cesarean Section n11626 2829%58 27p=0.004 versus bupivacaine 15n9233 4221%49 40 11Epidural Administration In Postoperative Pain Management There were clinical studies performed in 382 patients to evaluate ropivacaine HCl mg/mL (0.2%) for postoperative pain management after upper and lower abdominal surgery and after orthopedic surgery. The studies utilized intravascular morphine via PCA as rescue medication and quantified as an efficacy variable. Epidural anesthesia with ropivacaine HCl mg/mL, (0.5%) was used intraoperatively for each of these procedures prior to initiation of postoperative ropivacaine. The incidence and intensity of the motor block were dependent on the dose rate of ropivacaine and the site of injection. Cumulative doses of up to 770 mg of ropivacaine were administered over 24 hours (intraoperative block plus postoperative continuous infusion). The overall quality of pain relief, as judged by the patients, in the ropivacaine groups was rated as good or excellent (73% to 100%). The frequency of motor block was greatest at hours and decreased during the infusion period in all groups. At least 80% of patients in the upper and lower abdominal studies and 42% in the orthopedic studies had no motor block at the end of the 21-hour infusion period. Sensory block was also dose rate-dependent and decrease in spread was observed during the infusion period. double-blind, randomized, clinical trial compared lumbar epidural infusion of ropivacaine HCl (n=26) and bupivacaine (n=26) at mg/mL (8 mL/h), for 24 hours after knee replacement. In this study, the pain scores were higher in the ropivacaine group, but the incidence and the intensity of motor block were lower. Continuous epidural infusion of ropivacaine HCl mg/mL (0.2%) during up to 72 hours for postoperative pain management after major abdominal surgery was studied in multicenter, double-blind studies. total of 391 patients received low thoracic epidural catheter, and ropivacaine HCl 7.5 mg/L (0.75%) was given for surgery, in combination with GA. Postoperatively, ropivacaine HCl mg/mL (0.2%), to 14 mL/h, alone or with fentanyl 1, 2, or mcg/mL was infused through the epidural catheter and adjusted according to the patients needs. These studies support the use of ropivacaine HCl mg/mL (0.2%) for epidural infusion at to 14 mL/h (12 to 28 mg) for up to 72 hours and demonstrated adequate analgesia with only slight and nonprogressive motor block in cases of moderate to severe postoperative pain. Clinical studies with mg/mL (0.2%) ropivacaine HCl have demonstrated that infusion rates of to 14 mL (12 to 28 mg) per hour provide adequate analgesia with nonprogressive motor block in cases of moderate to severe postoperative pain. In these studies, this technique resulted in significant reduction in patients morphine rescue dose requirement. Clinical experience supports the use of ropivacaine epidural infusions for up to 72 hours. Peripheral Nerve Block Ropivacaine HCl, mg/mL (0.5%), was evaluated for its ability to provide anesthesia for surgery using the techniques of Peripheral Nerve Block. There were 13 studies performed including series of pharmacodynamic and pharmacokinetic studies performed on minor nerve blocks. From these, 235 ropivacaine-treated patients were evaluable for efficacy. Ropivacaine HCl was used in doses up to 275 mg. When used for brachial plexus block, onset depended on technique used. Supraclavicular blocks were consistently more successful than axillary blocks. The median onset of sensory block (anesthesia) produced by ropivacaine 0.5% via axillary block ranged from 10 minutes (medial brachial cutaneous nerve) to 45 minutes (musculocutaneous nerve). Median duration ranged from 3.7 hours (medial brachial cutaneous nerve) to 8.7 hours (ulnar nerve). The mg/mL (0.5%) ropivacaine HCl solution gave success rates from 56% to 86% for axillary blocks, compared with 92% for supraclavicular blocks. In addition, ropivacaine HCl, 7.5 mg/mL (0.75%), was evaluated in 99 ropivacaine-treated patients, in double-blind studies, performed to provide anesthesia for surgery using the techniques of Brachial Plexus Block. Ropivacaine HCl 7.5 mg/mL was compared to bupivacaine mg/mL. In study, patients underwent axillary brachial plexus block using injections of 40 mL (300 mg) of ropivacaine HCl, 7.5 mg/mL (0.75%) or 40 mL injections of bupivacaine, mg/mL (200 mg). In second study, patients underwent subclavian perivascular brachial plexus block using 30 mL (225 mg) of ropivacaine HCl, 7.5 mg/mL (0.75%) or 30 mL of bupivacaine mg/mL (150 mg). There was no significant difference between the ropivacaine and bupivacaine groups in either study with regard to onset of anesthesia, duration of sensory blockade, or duration of anesthesia. The median duration of anesthesia varied between 11.4 and 14.4 hours with both techniques. In one study, using the axillary technique, the quality of analgesia and muscle relaxation in the ropivacaine group was judged to be significantly superior to bupivacaine by both investigator and surgeon. However, using the subclavian perivascular technique, no statistically significant difference was found in the quality of analgesia and muscle relaxation as judged by both the investigator and surgeon. The use of ropivacaine HCl 7.5 mg/mL for block of the brachial plexus via either the subclavian perivascular approach using 30 mL (225 mg) or via the axillary approach using 40 mL (300 mg) both provided effective and reliable anesthesia. Local Infiltration total of clinical studies were performed to evaluate the local infiltration of ropivacaine to produce anesthesia for surgery and analgesia in postoperative pain management. In these studies 297 patients who received ropivacaine HCl in doses up to 200 mg (concentrations up to mg/mL, 0.5%) were evaluable for efficacy. With infiltration of 100 to 200 mg ropivacaine HCl, the time to first request for analgesic was to hours. When compared to placebo, ropivacaine produced lower pain scores and reduction of analgesic consumption.

DOSAGE & ADMINISTRATION SECTION.

DOSAGE AND ADMINISTRATION. The rapid injection of large volume of local anesthetic solution should be avoided and fractional (incremental) doses should always be used. The smallest dose and concentration required to produce the desired result should be administered. There have been adverse event reports of chondrolysis in patients receiving intra-articular infusions of local anesthetics following arthroscopic and other surgical procedures. Ropivacaine is not approved for this use (see WARNINGS and DOSAGE AND ADMINISTRATION).The dose of any local anesthetic administered varies with the anesthetic procedure, the area to be anesthetized, the vascularity of the tissues, the number of neuronal segments to be blocked, the depth of anesthesia and degree of muscle relaxation required, the duration of anesthesia desired, individual tolerance, and the physical condition of the patient. Patients in poor general condition due to aging or other compromising factors such as partial or complete heart conduction block, advanced liver disease or severe renal dysfunction require special attention although regional anesthesia is frequently indicated in these patients. To reduce the risk of potentially serious adverse reactions, attempts should be made to optimize the patients condition before major blocks are performed, and the dosage should be adjusted accordingly. Use an adequate test dose (3 to mL of short-acting local anesthetic solution containing epinephrine) prior to induction of complete block. This test dose should be repeated if the patient is moved in such fashion as to have displaced the epidural catheter. Allow adequate time for onset of anesthesia following administration of each test dose. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. Solutions which are discolored or that contain particulate matter should not be administered. Table DOSAGE RECOMMENDATIONS Not Applicable+ The dose for major nerve block must be adjusted according to site of administration and patient status. Supraclavicular brachial plexus blocks may be associated with higher frequency of serious adverse reactions, regardless of the local anesthetic used (see PRECAUTIONS). Median dose of 21 mg per hour was administered by continuous infusion or by incremental injections (top-ups) over median delivery time of 5.5 hours. Cumulative doses up to 770 mg of ropivacaine HCl; over 24 hours (intraoperative block plus postoperative infusion); Continuous epidural infusion at rates up to 28 mg per hour for 72 hours have been well tolerated in adults, i.e., 2016 mg plus surgical dose of approximately 100 mg to 150 mg as top-up. Conc.Volume mLDose mgOnset minDurationhoursmg/mL(%)SURGICAL ANESTHESIA Lumbar EpiduralAdministrationSurgery57.510(0.5%)(0.75%)(1%)15 to 3015 to 2515 to 2075 to 150113 to 188150 to 20015 to 3010 to 2010 to 202 to 43 to 54 to 6Lumbar EpiduralAdministrationCesarean Section57.5(0.5%)(0.75%)20 to 3015 to 20100 to 150113 to 15015 to 2510 to 202 to 43 to 5Thoracic EpiduralAdministrationSurgery57.5(0.5%)(0.75%)5 to 155 to 1525 to 7538 to 11310 to 2010 to 20n/an/aMajor Nerve Block+(e.g., brachial plexus block)57.5(0.5%)(0.75%)35 to 5010 to 40175 to 25075 to 30015 to 3010 to 255 to 86 to 10Field Block(e.g., minor nerve blocks and infiltration) 5(0.5%)1 to 405 to 2001 to 152 to 6LABOR PAIN MANAGEMENT Lumbar Epidural Administration Initial Dose2(0.2%)10 to 2020 to 4010 to 150.5 to 1.5Continuous infusion 2(0.2%)6 to 14 mL/h12 to 28 mg/hn/an/aIncremental injections (top-up) 2(0.2%)10 to 15 mL/h20 to 30 mg/hn/an/aPOSTOPERATIVE PAIN MANAGEMENTLumbar Epidural AdministrationContinuous infusion 2(0.2%)6 to 14 mL/h12 to 28 mg/hn/an/aThoracic Epidural AdministrationContinuous infusion 2(0.2%)6 to 14 mL/h12 to 28 mg/hn/an/aInfiltration2(0.2%)1 to 1002 to 2001 to 52 to 6(e.g., minor nerve block)5(0.5%)1 to 405 to 2001 to 52 to 6The doses in the table are those considered to be necessary to produce successful block and should be regarded as guidelines for use in adults. Individual variations in onset and duration occur. The figures reflect the expected average dose range needed. For other local anesthetic techniques standard current textbooks should be consulted.When prolonged blocks are used, either through continuous infusion or through repeated bolus administration, the risks of reaching toxic plasma concentration or inducing local neural injury must be considered. Experience to date indicates that cumulative dose of up to 770 mg ropivacaine HCl administered over 24 hours is well tolerated in adults when used for postoperative pain management: i.e., 2016 mg. Caution should be exercised when administering ropivacaine for prolonged periods of time, e.g., 70 hours in debilitated patients. For treatment of postoperative pain, the following technique can be recommended: If regional anesthesia was not used intraoperatively, then an initial epidural block with mL to mL ropivacaine is induced via an epidural catheter. Analgesia is maintained with an infusion of ropivacaine HCl mg/mL (0.2%). Clinical studies have demonstrated that infusion rates of mL to 14 mL (12 mg to 28 mg) per hour provide adequate analgesia with nonprogressive motor block. With this technique significant reduction in the need for opioids was demonstrated. Clinical experience supports the use of ropivacaine epidural infusions for up to 72 hours.

PHARMACODYNAMICS SECTION.

12.2Pharmacodynamics Studies in humans have demonstrated that, unlike most other local anesthetics, the presence of epinephrine has no major effect on either the time of onset or the duration of action of ropivacaine. Likewise, addition of epinephrine to ropivacaine has no effect on limiting systemic absorption of ropivacaine. Systemic absorption of local anesthetics can produce effects on the central nervous and cardiovascular systems. At blood concentrations achieved with therapeutic doses, changes in cardiac conduction, excitability, refractoriness, contractility, and peripheral vascular resistance have been reported. Toxic blood concentrations depress cardiac conduction and excitability, which may lead to atrioventricular block, ventricular arrhythmias and to cardiac arrest, sometimes resulting in fatalities. In addition, myocardial contractility is depressed and peripheral vasodilation occurs, leading to decreased cardiac output and arterial blood pressure. Following systemic absorption, local anesthetics can produce central nervous system stimulation, depression or both. Apparent central stimulation is usually manifested as restlessness, tremors and shivering, progressing to convulsions, followed by depression and coma, progressing ultimately to respiratory arrest. However, the local anesthetics have primary depressant effect on the medulla and on higher centers. The depressed stage may occur without prior excited stage. In clinical pharmacology studies (total n=24) ropivacaine and bupivacaine were infused (10 mg/min) in human volunteers until the appearance of CNS symptoms, e.g., visual or hearing disturbances, perioral numbness, tingling and others. Similar symptoms were seen with both drugs. In study, the mean +- SD maximum tolerated intravenous dose of ropivacaine infused (124 +- 38 mg) was significantly higher than that of bupivacaine (99 +- 30 mg) while in the other study the doses were not different (115 +- 29 mg of ropivacaine and 103 +- 30 mg of bupivacaine). In the latter study, the number of subjects reporting each symptom was similar for both drugs with the exception of muscle twitching which was reported by more subjects with bupivacaine than ropivacaine at comparable intravenous doses. At the end of the infusion, ropivacaine in both studies caused significantly less depression of cardiac conductivity (less QRS widening) than bupivacaine. Ropivacaine and bupivacaine caused evidence of depression of cardiac contractility, but there were no changes in cardiac output. Clinical data in one published article indicate that differences in various pharmacodynamic measures were observed with increasing age. In one study, the upper level of analgesia increased with age, the maximum decrease of mean arterial pressure (MAP) declined with age during the first hour after epidural administration, and the intensity of motor blockade increased with age. However, no pharmacokinetic differences were observed between elderly and younger patients. In non-clinical pharmacology studies comparing ropivacaine and bupivacaine in several animal species, the cardiac toxicity of ropivacaine was less than that of bupivacaine, although both were considerably more toxic than lidocaine. Arrhythmogenic and cardio-depressant effects were seen in animals at significantly higher doses of ropivacaine than bupivacaine. The incidence of successful resuscitation was not significantly different between the ropivacaine and bupivacaine groups.

PHARMACOKINETICS SECTION.

12.3Pharmacokinetics Absorption The systemic concentration of ropivacaine is dependent on the total dose and concentration of drug administered, the route of administration, the patients hemodynamic/circulatory condition, and the vascularity of the administration site. From the epidural space, ropivacaine shows complete and biphasic absorption. The half-lives of the phases, (mean +- SD) are 14 +- minutes and 4.2 +- 0.9 h, respectively. The slow absorption is the rate limiting factor in the elimination of ropivacaine that explains why the terminal half-life is longer after epidural than after intravenous administration. Ropivacaine shows dose-proportionality up to the highest intravenous dose studied, 80 mg, corresponding to mean +- SD peak plasma concentration of 1.9 +- 0.3 mcg/mL.Table Pharmacokinetic (Plasma Concentration-Time) Data From Clinical TrialsRouteEpidural InfusionContinuous 72 hour epidural infusion after an epidural block with or 10 mg/mL.Epidural InfusionEpidural BlockEpidural anesthesia with 7.5 mg/mL (0.75%) for cesarean delivery.Epidural BlockPlexus BlockBrachial plexus block with 7.5 mg/mL (0.75%) ropivacaine.IV Infusion20 minute IV infusion to volunteers (40 mg).Dose (mg)1493+-102075+-2061217+-277150187.530040N121211881012Cmax (mg/L)2.4+-1Cmax measured at the end of infusion (i.e., at 72 hr). 2.8+-0.5 2.3+-1.1 1.1+-0.21.6+-0.62.3+-0.81.2+-0.2Cmax measured at the end of infusion (i.e., at 20 minutes). Tmax (min)n/an/a=not applicable n/an/a43+-1434+-954+-22n/aAUC0- (mg.h/L)135.5+-50145+-34161+-907.2+-211.3+-413+-3.31.8+-0.6CL (L/h)11.0313.7n/a5.5+-25+-2.6n/a21.2+-7t1/2 (hr)t1/2 is the true terminal elimination half-life. On the other hand, t1/2 follows absorption-dependent elimination (flip-flop) after non-intravenous administration. 5+-2.55.7+-36+-35.7+-27.1+-36.8+-3.21.9+-0.5In some patients after 300 mg dose for brachial plexus block, free plasma concentrations of ropivacaine may approach the threshold for CNS toxicity [see Warnings and Precautions (5.7)]. At dose of greater than 300 mg, for local infiltration, the terminal half-life may be longer (> 30 hours).DistributionAfter intravascular infusion, ropivacaine has steady-state volume of distribution of 41 +- liters. Ropivacaine is 94% protein bound, mainly to 1-acid glycoprotein. An increase in total plasma concentrations during continuous epidural infusion has been observed, related to postoperative increase of 1-acid glycoprotein. Variations in unbound, i.e., pharmacologically active, concentrations have been less than in total plasma concentration. Ropivacaine readily crosses the placenta and equilibrium in regard to unbound concentration will be rapidly reached [see Warnings and Precautions (5) and Use in Specific Population (8.1)]. MetabolismRopivacaine is extensively metabolized in the liver, predominantly by aromatic hydroxylation mediated by cytochrome P4501A to 3-hydroxy ropivacaine. After single IV dose approximately 37% of the total dose is excreted in the urine as both free and conjugated 3-hydroxy ropivacaine. Low concentrations of 3-hydroxy ropivacaine have been found in the plasma. Urinary excretion of the 4-hydroxy ropivacaine, and both the 3-hydroxy N-de-alkylated (3-OH-PPX) and 4-hydroxy N-de-alkylated (4-OH-PPX) metabolites account for less than 3% of the dose. An additional metabolite, 2-hydroxy-methyl-ropivacaine, has been identified but not quantified in the urine. The N-de-alkylated metabolite of ropivacaine (PPX) and 3-OH-ropivacaine are the major metabolites excreted in the urine during epidural infusion. Total PPX concentration in the plasma was about half as that of total ropivacaine; however, mean unbound concentrations of PPX were about to times higher than that of unbound ropivacaine following continuous epidural infusion up to 72 hours. Unbound PPX, 3-hydroxy and 4-hydroxy ropivacaine, have pharmacological activity in animal models less than that of ropivacaine. There is no evidence of in vivo racemization in urine of ropivacaine.EliminationThe kidney is the main excretory organ for most local anesthetic metabolites. In total, 86% of the ropivacaine dose is excreted in the urine after intravenous administration of which only 1% relates to unchanged drug. After intravenous administration ropivacaine has mean +- SD total plasma clearance of 387 +- 107 mL/min, an unbound plasma clearance of 7.2 +- 1.6 L/min, and renal clearance of mL/min. The mean +- SD terminal half-life is 1.8 +- 0.7 after intravascular administration and 4.2 +- h after epidural administration.

PREGNANCY SECTION.

8.1Pregnancy Risk SummaryThere are no available human data on use of ropivacaine Injection in pregnant women to evaluate drug-associated risk of major birth defects, miscarriage, or other adverse maternal or fetal outcomes. Local anesthetics may cause varying degrees of toxicity to the mother and fetus and adverse reactions include alterations of the central nervous system, peripheral vascular tone, and cardiac function (see Clinical Considerations). No teratogenicity was observed at doses up to 0.3 times the maximum recommended human dose of 770 mg/24 hours for epidural use, and equal to the MRHD of 250 mg for nerve block use, based on body surface area (BSA) comparisons and 60 kg human weight (see Animal Data).The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have background risk of birth defect, loss, or other adverse outcomes. In the U. S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.Clinical ConsiderationsLabor or Delivery Local anesthetics, including ropivacaine, rapidly cross the placenta, and when used for epidural block can cause varying degrees of maternal, fetal and neonatal toxicity [see Clinical Pharmacology (12)]. The incidence and degree of toxicity depend upon the procedure performed, the type and amount of drug used, and the technique of drug administration. Adverse reactions in the parturient, fetus and neonate involve alterations of the central nervous system, peripheral vascular tone and cardiac function. Maternal Adverse Reactions Maternal hypotension has resulted from regional anesthesia. Local anesthetics produce vasodilation by blocking sympathetic nerves. Therefore, during treatment of systemic toxicity, maternal hypotension or fetal bradycardia following regional block, the parturient should be maintained in the left lateral decubitus position if possible, or manual displacement of the uterus off the great vessels be accomplished. Elevating the patients legs will also help prevent decreases in blood pressure. The fetal heart rate also should be monitored continuously, and electronic fetal monitoring is highly advisable. DataAnimal DataNo malformations were reported in embryo-fetal development toxicity studies conducted in pregnant New Zealand white rabbits and Sprague-Dawley rats. During gestation days to 18, rabbits received daily subcutaneous doses of ropivacaine at 1.3, 4.2, or 13 mg/kg/day (equivalent to 0.03, 0.10, and 0.33 times the maximum recommended human dose (MRHD) of 770 mg/24 hours, respectively, and 0.10, 0.32, and 1.0 times the MRHD of 250 mg for nerve block use, respectively based on body surface area (BSA) comparisons and 60 kg human weight). Rats received daily subcutaneous doses of 5.3, 11, and 26 mg/kg/day (equivalent to 0.07, 0.14, and 0.33 times the MRHD for epidural use, respectively, and 0.21, 0.43, and 1.0 times the MRHD for nerve block use, respectively, based on BSA comparisons) during GD to 15.No treatment-related effects on late fetal development, parturition, litter size, lactation, neonatal viability, or growth of the offspring were reported in prenatal and postnatal reproductive and development toxicity study; however functional endpoints were not evaluated. Female rats were dosed daily subcutaneously from GD 15 to Lactation Day 20 at doses of 5.3, 11, and 26 mg/kg/day (equivalent to 0.07, 0.1, and 0.3 times the MRHD for epidural use, respectively, and 0.21, 0.43, and 1.0 times the MRHD for nerve block use, respectively), with maternal toxicity exhibited at the high dose.No adverse effects in physical developmental milestones or in behavioral tests were reported in 2-generational reproduction study, in which rats received daily subcutaneous doses of 6.3, 12, and 23 mg/kg/day (equivalent to 0.08, 0.15, and 0.29 times the MRHD for epidural use, respectively, and 0.24, 0.45, and 0.88 times the MRHD for nerve block use, respectively, based on BSA comparisons) for weeks before mating and during mating for males, and for weeks before mating and during mating, pregnancy, and lactation, up to day 42 post coitus for females. Significant pup loss was observed in the high dose group during the first days postpartum, from few hours up to days after delivery compared to the control group, which was considered secondary to impaired maternal care due to maternal toxicity. No differences were observed in litter parameters, or fertility, mean gestation time, or number of live births were observed between the control (saline) and treatment groups [see Carcinogenesis, Mutagenesis, Impairment of Fertility (13.1)].

USE IN SPECIFIC POPULATIONS SECTION.

8 USE IN SPECIFIC POPULATIONS 8.1Pregnancy Risk SummaryThere are no available human data on use of ropivacaine Injection in pregnant women to evaluate drug-associated risk of major birth defects, miscarriage, or other adverse maternal or fetal outcomes. Local anesthetics may cause varying degrees of toxicity to the mother and fetus and adverse reactions include alterations of the central nervous system, peripheral vascular tone, and cardiac function (see Clinical Considerations). No teratogenicity was observed at doses up to 0.3 times the maximum recommended human dose of 770 mg/24 hours for epidural use, and equal to the MRHD of 250 mg for nerve block use, based on body surface area (BSA) comparisons and 60 kg human weight (see Animal Data).The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have background risk of birth defect, loss, or other adverse outcomes. In the U. S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.Clinical ConsiderationsLabor or Delivery Local anesthetics, including ropivacaine, rapidly cross the placenta, and when used for epidural block can cause varying degrees of maternal, fetal and neonatal toxicity [see Clinical Pharmacology (12)]. The incidence and degree of toxicity depend upon the procedure performed, the type and amount of drug used, and the technique of drug administration. Adverse reactions in the parturient, fetus and neonate involve alterations of the central nervous system, peripheral vascular tone and cardiac function. Maternal Adverse Reactions Maternal hypotension has resulted from regional anesthesia. Local anesthetics produce vasodilation by blocking sympathetic nerves. Therefore, during treatment of systemic toxicity, maternal hypotension or fetal bradycardia following regional block, the parturient should be maintained in the left lateral decubitus position if possible, or manual displacement of the uterus off the great vessels be accomplished. Elevating the patients legs will also help prevent decreases in blood pressure. The fetal heart rate also should be monitored continuously, and electronic fetal monitoring is highly advisable. DataAnimal DataNo malformations were reported in embryo-fetal development toxicity studies conducted in pregnant New Zealand white rabbits and Sprague-Dawley rats. During gestation days to 18, rabbits received daily subcutaneous doses of ropivacaine at 1.3, 4.2, or 13 mg/kg/day (equivalent to 0.03, 0.10, and 0.33 times the maximum recommended human dose (MRHD) of 770 mg/24 hours, respectively, and 0.10, 0.32, and 1.0 times the MRHD of 250 mg for nerve block use, respectively based on body surface area (BSA) comparisons and 60 kg human weight). Rats received daily subcutaneous doses of 5.3, 11, and 26 mg/kg/day (equivalent to 0.07, 0.14, and 0.33 times the MRHD for epidural use, respectively, and 0.21, 0.43, and 1.0 times the MRHD for nerve block use, respectively, based on BSA comparisons) during GD to 15.No treatment-related effects on late fetal development, parturition, litter size, lactation, neonatal viability, or growth of the offspring were reported in prenatal and postnatal reproductive and development toxicity study; however functional endpoints were not evaluated. Female rats were dosed daily subcutaneously from GD 15 to Lactation Day 20 at doses of 5.3, 11, and 26 mg/kg/day (equivalent to 0.07, 0.1, and 0.3 times the MRHD for epidural use, respectively, and 0.21, 0.43, and 1.0 times the MRHD for nerve block use, respectively), with maternal toxicity exhibited at the high dose.No adverse effects in physical developmental milestones or in behavioral tests were reported in 2-generational reproduction study, in which rats received daily subcutaneous doses of 6.3, 12, and 23 mg/kg/day (equivalent to 0.08, 0.15, and 0.29 times the MRHD for epidural use, respectively, and 0.24, 0.45, and 0.88 times the MRHD for nerve block use, respectively, based on BSA comparisons) for weeks before mating and during mating for males, and for weeks before mating and during mating, pregnancy, and lactation, up to day 42 post coitus for females. Significant pup loss was observed in the high dose group during the first days postpartum, from few hours up to days after delivery compared to the control group, which was considered secondary to impaired maternal care due to maternal toxicity. No differences were observed in litter parameters, or fertility, mean gestation time, or number of live births were observed between the control (saline) and treatment groups [see Carcinogenesis, Mutagenesis, Impairment of Fertility (13.1)].. 8.2Lactation Risk SummaryOne publication reported that ropivacaine is present in human milk at low levels following administration of ropivacaine in women undergoing cesarean section. No adverse reactions were reported in the infants. There is no available information on the drugs effects on milk production. The developmental and health benefits of breastfeeding should be considered along with the mothers clinical need for ropivacaine and any potential adverse effects on the breastfed child from ropivacaine or from the underlying maternal condition.. 8.4Pediatric Use The safety and efficacy of ropivacaine in pediatric patients have not been established. 8.5Geriatric Use Of the 2,978 subjects that were administered ropivacaine injection in 71 controlled and uncontrolled clinical studies, 803 patients (27%) were 65 years of age or older which includes 127 patients (4%) 75 years of age and over. Ropivacaine injection was found to be safe and effective in the patients in these studies. Clinical data in one published article indicate that differences in various pharmacodynamic measures were observed with increasing age. In one study, the upper level of analgesia increased with age, the maximum decrease of mean arterial pressure (MAP) declined with age during the first hour after epidural administration, and the intensity of motor blockade increased with age.This drug and its metabolites are known to be excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function. Elderly patients are more likely to have decreased hepatic, renal, or cardiac function, as well as concomitant disease. Therefore, care should be taken in dose selection, starting at the low end of the dosage range, and it may be useful to monitor renal function [see Clinical Pharmacology (12.3)]. 8.6Hepatic Impairment Because amide-type local anesthetics such as ropivacaine are metabolized by the liver, these drugs, especially repeat doses, should be used cautiously in patients with hepatic disease. Patients with severe hepatic disease, because of their inability to metabolize local anesthetics normally, are at greater risk of developing toxic plasma concentrations [see Warnings and Precautions (5.11)].. 8.7Renal Impairment This drug and its metabolites are known to be excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function. Therefore, care should be taken in dose selection, starting at the low end of the dosage range, and it may be useful to monitor renal function [see Clinical Pharmacology (12.3)].

WARNINGS AND PRECAUTIONS SECTION.

5 WARNINGS AND PRECAUTIONS oDelay in proper management of dose-related toxicity, underventilation, and/or altered sensitivity may lead to the development of acidosis, cardiac arrest and, possibly, death. (5.1)oIn performing ropivacaine hydrochloride blocks, unintended intravenous injection is possible and may result in cardiac arrhythmia or cardia arrest. (5.2)oIntra-articular infusions of local anesthetics may cause chondrolysis. Ropivacaine hydrochloride is not approved for this use. (5.3)oSigns of methemoglobinemia may occur. (5.4). oDelay in proper management of dose-related toxicity, underventilation, and/or altered sensitivity may lead to the development of acidosis, cardiac arrest and, possibly, death. (5.1). oIn performing ropivacaine hydrochloride blocks, unintended intravenous injection is possible and may result in cardiac arrhythmia or cardia arrest. (5.2). oIntra-articular infusions of local anesthetics may cause chondrolysis. Ropivacaine hydrochloride is not approved for this use. (5.3). oSigns of methemoglobinemia may occur. (5.4). 5.1General Warnings and Precautions Prior to receiving major blocks the general condition of the patient should be optimized and the patient should have an IV line inserted. All necessary precautions should be taken to avoid intravascular injection. Local anesthetics should only be administered by clinicians who are well versed in the diagnosis and management of dose-related toxicity and other acute emergencies which might arise from the block to be employed, and then only after insuring the immediate (without delay) availability of oxygen, other resuscitative drugs, cardiopulmonary resuscitative equipment, and the personnel resources needed for proper management of toxic reactions and related emergencies [see Adverse Reactions (6) and Overdosage (10.1)]. Delay in proper management of dose-related toxicity, underventilation from any cause, and/or altered sensitivity may lead to the development of acidosis, cardiac arrest and, possibly, death.The safe and effective use of local anesthetics depends on proper dosage, correct technique, adequate precautions and readiness for emergencies.Resuscitative equipment, oxygen and other resuscitative drugs should be available for immediate use [see Adverse Reactions (6)]. The lowest dosage that results in effective anesthesia should be used to avoid high plasma levels and serious adverse events. Injections should be made slowly and incrementally, with frequent aspirations before and during the injection to avoid intravascular injection. When continuous catheter technique is used, syringe aspirations should also be performed before and during each supplemental injection. During the administration of epidural anesthesia, it is recommended that test dose of local anesthetic with fast onset be administered initially and that the patient be monitored for central nervous system and cardiovascular toxicity, as well as for signs of unintended intrathecal administration before proceeding. When clinical conditions permit, consideration should be given to employing local anesthetic solutions, which contain epinephrine for the test dose because circulatory changes compatible with epinephrine may also serve as warning sign of unintended intravascular injection. An intravascular injection is still possible even if aspirations for blood are negative. Administration of higher than recommended doses of ropivacaine hydrochloride to achieve greater motor blockade or increased duration of sensory blockade may result in cardiovascular depression, particularly in the event of inadvertent intravascular injection. Tolerance to elevated blood levels varies with the physical condition of the patient. Debilitated, elderly patients and acutely ill patients should be given reduced doses commensurate with their age and physical condition. Local anesthetics should also be used with caution in patients with hypotension, hypovolemia or heart block.Solutions of ropivacaine hydrochloride should not be used for the production of obstetrical paracervical block anesthesia, retrobulbar block, or spinal anesthesia (subarachnoid block) due to insufficient data to support such use. Intravenous regional anesthesia (bier block) should not be performed due to lack of clinical experience and the risk of attaining toxic blood levels of ropivacaine.It is essential that aspiration for blood, or cerebrospinal fluid (where applicable), be done prior to injecting any local anesthetic, both the original dose and all subsequent doses, to avoid intravascular or subarachnoid injection. However, negative aspiration does not ensure against an intravascular or subarachnoid injection.. 5.2Unintended Intravenous Injection In performing ropivacaine hydrochloride blocks, unintended intravenous injection is possible and may result in cardiac arrhythmia or cardiac arrest. The potential for successful resuscitation has not been studied in humans. There have been rare reports of cardiac arrest during the use of ropivacaine hydrochloride for epidural anesthesia or peripheral nerve blockade, the majority of which occurred after unintentional accidental intravascular administration in elderly patients and in patients with concomitant heart disease. In some instances, resuscitation has been difficult. Should cardiac arrest occur, prolonged resuscitative efforts may be required to improve the probability of successful outcome.Ropivacaine hydrochloride should be administered in incremental doses. It is not recommended for emergency situations, where fast onset of surgical anesthesia is necessary. Historically, pregnant patients were reported to have high risk for cardiac arrhythmias, cardiac/circulatory arrest and death when 0.75% bupivacaine (another member of the amino amide class of local anesthetics) was inadvertently rapidly injected intravenously.. 5.3Intra-Articular Infusions and Risk of Chondrolysis Intra-articular infusions of local anesthetics following arthroscopic and other surgical procedures is an unapproved use, and there have been post-marketing reports of chondrolysis in patients receiving such infusions. The majority of reported cases of chondrolysis have involved the shoulder joint; cases of gleno-humeral chondrolysis have been described in pediatric and adult patients following intra-articular infusions of local anesthetics with and without epinephrine for periods of 48 to 72 hours. There is insufficient information to determine whether shorter infusion periods are not associated with these findings. The time of onset of symptoms, such as joint pain, stiffness and loss of motion can be variable, but may begin as early as the 2nd month after surgery. Currently, there is no effective treatment for chondrolysis; patients who experienced chondrolysis have required additional diagnostic and therapeutic procedures and some required arthroplasty or shoulder replacement.. 5.4Risk of Methemoglobinemia Cases of methemoglobinemia have been reported in association with local anesthetic use. Although all patients are at risk for methemoglobinemia, patients with glucose-6-phosphate dehydrogenase deficiency, congenital or idiopathic methemoglobinemia, cardiac or pulmonary compromise, infants under months of age, and concurrent exposure to oxidizing agents or their metabolites are more susceptible to developing clinical manifestations of the condition. If local anesthetics must be used in these patients, close monitoring for symptoms and signs of methemoglobinemia is recommended.Signs of methemoglobinemia may occur immediately or may be delayed some hours after exposure, and are characterized by cyanotic skin discoloration and/or abnormal coloration of the blood. Methemoglobin levels may continue to rise; therefore, immediate treatment is required to avert more serious central nervous system and cardiovascular adverse effects, including seizures, coma, arrhythmias, and death. Discontinue ropivacaine hydrochloride and any other oxidizing agents. Depending on the severity of the signs and symptoms, patients may respond to supportive care, i.e., oxygen therapy, hydration. more severe clinical presentation may require treatment with methylene blue, exchange transfusion, or hyperbaric oxygen.. 5.5Central Nervous System Toxicity Careful and constant monitoring of cardiovascular and respiratory vital signs (adequacy of ventilation) and the patients state of consciousness should be performed after each local anesthetic injection. It should be kept in mind at such times that restlessness, anxiety, incoherent speech, light-headedness, numbness and tingling of the mouth and lips, metallic taste, tinnitus, dizziness, blurred vision, tremors, twitching, depression, or drowsiness may be early warning signs of central nervous system toxicity.. 5.6Epidural Anesthesia A well-known risk of epidural anesthesia may be an unintentional subarachnoid injection of local anesthetic. Two clinical studies have been performed to verify the safety of ropivacaine hydrochloride at volume of mL injected into the subarachnoid space since this dose represents an incremental epidural volume that could be unintentionally injected. The 15 and 22.5 mg doses injected resulted in sensory levels as high as T5 and T4, respectively. Anesthesia to pinprick started in the sacral dermatomes in to minutes, extended to the T10 level in 10 to 13 minutes and lasted for approximately hours. The results of these two clinical studies showed that 3 mL dose did not produce any serious adverse events when spinal anesthesia blockade was achieved.During epidural administration, ropivacaine hydrochloride should be administered in incremental doses of to mL with sufficient time between doses to detect toxic manifestations of unintentional intravascular or intrathecal injection. Syringe aspirations should also be performed before and during each supplemental injection in continuous (intermittent) catheter techniques. An intravascular injection is still possible even if aspirations for blood are negative. During the administration of epidural anesthesia, it is recommended that test dose be administered initially and the effects monitored before the full dose is given. When clinical conditions permit, the test dose should contain an appropriate dose of epinephrine to serve as warning of unintentional intravascular injection. If injected into blood vessel, this amount of epinephrine is likely to produce transient epinephrine response within 45 seconds, consisting of an increase in heart rate and systolic blood pressure, circumoral pallor, palpitations and nervousness in the unsedated patient. The sedated patient may exhibit only pulse rate increase of 20 or more beats per minute for 15 or more seconds. Therefore, following the test dose, the heart should be continuously monitored for heart rate increase. Patients on beta-blockers may not manifest changes in heart rate, but blood pressure monitoring can detect rise in systolic blood pressure. test dose of short-acting amide anesthetic such as lidocaine is recommended to detect an unintentional intrathecal administration. This will be manifested within few minutes by signs of spinal block (e.g., decreased sensation of the buttocks, paresis of the legs, or, in the sedated patient, absent knee jerk). An intravascular or subarachnoid injection is still possible even if results of the test dose are negative. The test dose itself may produce systemic toxic reaction, high spinal or epinephrine-induced cardiovascular effects.. 5.7Use in Brachial Plexus Block Ropivacaine plasma concentrations may approach the threshold for central nervous system toxicity after the administration of 300 mg of ropivacaine for brachial plexus block. Caution should be exercised when using the 300 mg dose [see Overdosage (10) ]. The dose for major nerve block must be adjusted according to the site of administration and patient status. Supraclavicular brachial plexus blocks may be associated with higher frequency of serious adverse reactions, regardless of the local anesthetic used.. 5.8Use in Peripheral Nerve Block Major peripheral nerve blocks may result in the administration of large volume of local anesthetic in highly vascularized areas, often close to large vessels where there is an increased risk of intravascular injection and/or rapid systemic absorption, which can lead to high plasma concentrations.. 5.9Use in Head and Neck Area Small doses of local anesthetics injected into the head and neck area may produce adverse reactions similar to systemic toxicity seen with unintentional intravascular injections of larger doses. The injection procedures require the utmost care. Confusion, convulsions, respiratory depression, and/or respiratory arrest, and cardiovascular stimulation or depression have been reported. These reactions may be due to intra-arterial injection of the local anesthetic with retrograde flow to the cerebral circulation. Patients receiving these blocks should have their circulation and respiration monitored and be constantly observed. Resuscitative equipment and personnel for treating adverse reactions should be immediately available. Dosage recommendations should not be exceeded [see Dosage and Administration (2.2)].. 5.10Use in Ophthalmic Surgery The use of ropivacaine hydrochloride in retrobulbar blocks for ophthalmic surgery has not been studied. Until appropriate experience is gained, the use of ropivacaine hydrochloride for such surgery is not recommended.. 5.11Hepatic Disease Because amide-type local anesthetics such as ropivacaine are metabolized by the liver, these drugs, especially repeat doses,should be used cautiously in patients with hepatic disease. Patients with severe hepatic disease, because of their inability to metabolize local anesthetics normally, are at greater risk of developing toxic plasma concentrations.. 5.12Cardiovascular Impairment Local anesthetics should also be used with caution in patients with impaired cardiovascular function because they may be less able to compensate for functional changes associated with the prolongation of A-V conduction produced by these drugs.. 5.13Risk of Additive Effects Ropivacaine hydrochloride should be used with caution in patients receiving other local anesthetics or agents structurally related to amide-type local anesthetics, since the toxic effects of these drugs are additive [see Drug Interactions (7)]. Patients treated with class III antiarrhythmic drugs (e.g., amiodarone) should be under close surveillance and ECG monitoring considered, since cardiac effects may be additive [see Drug Interactions (7)]. 5.14Malignant Hyperthermia Many drugs used during the conduct of anesthesia are considered potential triggering agents for malignant hyperthermia (MH). Amide-type local anesthetics are not known to trigger this reaction. However, since the need for supplemental general anesthesia cannot be predicted in advance, it is suggested that standard protocol for MH management should be available.

CLINICAL STUDIES SECTION.

14 CLINICAL STUDIES Ropivacaine was studied as local anesthetic both for surgical anesthesia and for acute pain management [see Dosage and Administration (2)]. The onset, depth and duration of sensory block are, in general, similar to bupivacaine. However, the depth and duration of motor block, in general, are less than that with bupivacaine.. 14.1Epidural Administration in Surgery There were 25 clinical studies performed in 900 patients to evaluate ropivacaine epidural injection for general surgery. Ropivacaine hydrochloride was used in doses ranging from 75 to 250 mg. In doses of 100 to 200 mg, the median (1st to 3rd quartile) onset time to achieve T10 sensory block was 10 (5 to 13) minutes and the median (1st to 3rd quartile) duration at the T10 level was (3 to 5) hours [see Dosage and Administration (2.2)]. Higher doses produced more profound block with greater duration of effect.. 14.2Epidural Administration in Cesarean Section A total of 12 studies were performed with epidural administration of ropivacaine for cesarean section. Eight of these studies involved 218 patients using the concentration of mg/mL (0.5%) in doses up to 150 mg. Median onset measured at T6 ranged from 11 to 26 minutes. Median duration of sensory block at T6 ranged from 1.7 to 3.2 h, and duration of motor block ranged from 1.4 to 2.9 h. Ropivacaine provided adequate muscle relaxation for surgery in all cases. In addition, active controlled studies for cesarean section were performed in 264 patients at concentration of 7.5 mg/mL (0.75%) in doses up to 187.5 mg. Median onset measured at T6 ranged from to 15 minutes. Seventy-seven to 96% of ropivacaine-exposed patients reported no pain at delivery. Some patients received other anesthetic, analgesic, or sedative modalities during the course of the operative procedure. 14.3Epidural Administration in Labor and Delivery A total of double-blind clinical studies, involving 240 patients were performed to evaluate ropivacaine for epidural block for management of labor pain. When administered in doses up to 278 mg as intermittent injections or as continuous infusion, ropivacaine hydrochloride produced adequate pain relief. prospective meta-analysis on of these studies provided detailed evaluation of the delivered newborns and showed no difference in clinical outcomes compared to bupivacaine. There were significantly fewer instrumental deliveries in mothers receiving ropivacaine as compared to bupivacaine.Table Labor and Delivery Meta-Analysis: Mode of DeliveryDelivery ModeRopivacaine = 199Bupivacaine = 188N%N%Spontaneous Vertex 116589249Vacuum Extractor263327p=0.004 versus bupivacaine 40Forceps2842Cesarean Section29152111. 14.4Epidural Administration in Postoperative Pain Management There were clinical studies performed in 382 patients to evaluate ropivacaine hydrochloride mg/mL (0.2%) for postoperative pain management after upper and lower abdominal surgery and after orthopedic surgery. The studies utilized intravascular morphine via PCA as rescue medication and quantified as an efficacy variable. Epidural anesthesia with ropivacaine hydrochloride mg/mL, (0.5%) was used intraoperatively for each of these procedures prior to initiation of postoperative ropivacaine hydrochloride. The incidence and intensity of the motor block were dependent on the dose rate of ropivacaine hydrochloride and the site of injection. Cumulative doses of up to 770 mg of ropivacaine were administered over 24 hours (intraoperative block plus postoperative continuous infusion). The overall quality of pain relief, as judged by the patients, in the ropivacaine groups was rated as good or excellent (73% to 100%). The frequency of motor block was greatest at hours and decreased during the infusion period in all groups. At least 80% of patients in the upper and lower abdominal studies and 42% in the orthopedic studies had no motor block at the end of the 21-hour infusion period. Sensory block was also dose rate-dependent and decrease in spread was observed during the infusion period. double-blind, randomized, clinical trial compared lumbar epidural infusion of ropivacaine hydrochloride (n=26) and bupivacaine (n=26) at mg/mL (8 mL/h), for 24 hours after knee replacement. In this study, the pain scores were higher in the ropivacaine hydrochloride injection group, but the incidence and the intensity of motor block were lower. Continuous epidural infusion of ropivacaine hydrochloride mg/mL (0.2%) during up to 72 hours for postoperative pain management after major abdominal surgery was studied in multicenter, double-blind studies. total of 391 patients received low thoracic epidural catheter, and ropivacaine hydrochloride 7.5 mg/L (0.75%) was given for surgery, in combination with GA. Postoperatively, ropivacaine hydrochloride mg/mL (0.2%), to 14 mL/h, alone or with fentanyl 1, 2, or mcg/mL was infused through the epidural catheter and adjusted according to the patients needs. These studies support the use of ropivacaine hydrochloride mg/mL (0.2%) for epidural infusion at to 14 mL/h (12 to 28 mg) for up to 72 hours and demonstrated adequate analgesia with only slight and nonprogressive motor block in cases of moderate to severe postoperative pain. Clinical studies with mg/mL (0.2%) ropivacaine hydrochloride have demonstrated that infusion rates of to 14 mL (12 to 28 mg) per hour provide adequate analgesia with nonprogressive motor block in cases of moderate to severe postoperative pain. In these studies, this technique resulted in significant reduction in patients morphine rescue dose requirement. Clinical experience supports the use of ropivacaine epidural infusions for up to 72 hours. 14.5Peripheral Nerve Block Ropivacaine hydrochloride, mg/mL (0.5%), was evaluated for its ability to provide anesthesia for surgery using the techniques of Peripheral Nerve Block. There were 13 studies performed including series of pharmacodynamic and pharmacokinetic studies performed on minor nerve blocks. From these, 235 ropivacaine-treated patients were evaluable for efficacy. Ropivacaine hydrochloride was used in doses up to 275 mg. When used for brachial plexus block, onset depended on technique used. Supraclavicular blocks were consistently more successful than axillary blocks. The median onset of sensory block (anesthesia) produced by ropivacaine 0.5% via axillary block ranged from 10 minutes (medial brachial cutaneous nerve) to 45 minutes (musculocutaneous nerve). Median duration ranged from 3.7 hours (medial brachial cutaneous nerve) to 8.7 hours (ulnar nerve). The mg/mL (0.5%) ropivacaine hydrochloride solution gave success rates from 56% to 86% for axillary blocks, compared with 92% for supraclavicular blocks. In addition, ropivacaine hydrochloride, 7.5 mg/mL (0.75%), was evaluated in 99 ropivacaine-treated patients, in double-blind studies, performed to provide anesthesia for surgery using the techniques of Brachial Plexus Block. Ropivacaine hydrochloride 7.5 mg/mL was compared to bupivacaine mg/mL. In study, patients underwent axillary brachial plexus block using injections of 40 mL (300 mg) of ropivacaine hydrochloride, 7.5 mg/mL (0.75%) or 40 mL injections of bupivacaine, mg/mL (200 mg). In second study, patients underwent subclavian perivascular brachial plexus block using 30 mL (225 mg) of ropivacaine hydrochloride, 7.5 mg/mL (0.75%) or 30 mL of bupivacaine mg/mL (150 mg). There was no significant difference between the ropivacaine and bupivacaine groups in either study with regard to onset of anesthesia, duration of sensory blockade, or duration of anesthesia. The median duration of anesthesia varied between 11.4 and 14.4 hours with both techniques. In one study, using the axillary technique, the quality of analgesia and muscle relaxation in the ropivacaine group was judged to be significantly superior to bupivacaine by both investigator and surgeon. However, using the subclavian perivascular technique, no statistically significant difference was found in the quality of analgesia and muscle relaxation as judged by both the investigator and surgeon. The use of ropivacaine hydrochloride 7.5 mg/mL for block of the brachial plexus via either the subclavian perivascular approach using 30 mL (225 mg) or via the axillary approach using 40 mL (300 mg) both provided effective and reliable anesthesia. 14.6Local Infiltration A total of clinical studies were performed to evaluate the local infiltration of ropivacaine to produce anesthesia for surgery and analgesia in postoperative pain management. In these studies 297 patients who received ropivacaine hydrochloride in doses up to 200 mg (concentrations up to mg/mL, 0.5%) were evaluable for efficacy. With infiltration of 100 to 200 mg ropivacaine hydrochloride, the time to first request for analgesic was to hours. When compared to placebo, ropivacaine produced lower pain scores and reduction of analgesic consumption.