ADVERSE REACTIONS SECTION.

ADVERSE REACTIONS. Observed in Controlled Clinical Studies Atracurium was well tolerated and produced few adverse reactions during extensive clinical trials. Most adverse reactions were suggestive of histamine release. In studies including 875 patients, atracurium was discontinued in only one patient (who required treatment for bronchial secretions) and six other patients required treatment for adverse reactions attributable to atracurium (wheezing in one, hypotension in five). Of the five patients who required treatment for hypotension, three had history of significant cardiovascular disease. The overall incidence rate for clinically important adverse reactions, therefore, was 7/875 or 0.8%. Table includes all adverse reactions reported attributable to atracurium during clinical trials with 875 patients.Table 1: Percent of Patients Reporting Adverse Reactions Includes the recommended initial dosage range for most patients. Adverse ReactionInitial Atracurium Dose (mg/kg) 0.00 to 0.30(n 485) 0.31 to 0.50 (n 366) >0.60(n 24)Total(n 875) Skin Flush 1% 8.7% 29.2% 5% Erythema 0.6% 0.5% 0% 0.6% Itching 0.4% 0% 0% 0.2% Wheezing/Bronchial Secretions 0.2% 0.3% 0% 0.2% Hives 0.2% 0% 0% 0.1% Most adverse reactions were of little clinical significance unless they were associated with significant hemodynamic changes. Table summarizes the incidences of substantial vital sign changes noted during atracurium clinical trials with 530 patients, without cardiovascular disease, in whom these parameters were assessed.Table 2: Percent of Patients Showing >30% Vital Sign Changes Following Administration of Atracurium Includes the recommended initial dosage range for most patients. Vital Sign ChangeInitial Atracurium Dose (mg/kg) 0.00 to 0.30(n 365) 0.31 to 0.50 (n 144) >0.60(n 21)Total(n 530) Mean Arterial Pressure Increase 1.9% 2.8% 0% 2.1% Decrease 1.1% 2.1% 14.3% 1.9% Heart Rate Increase 1.6% 2.8% 4.8% 2.1% Decrease 0.8% 0% 0% 0.6% Observed in Clinical Practice Based on initial clinical practice experience in approximately million patients who received atracurium in the U.S. and in the United Kingdom, spontaneously reported adverse reactions were uncommon (approximately 0.01% to 0.02%). The following adverse reactions are among the most frequently reported, but there are insufficient data to support an estimate of their incidence:General: Allergic reactions (anaphylactic or anaphylactoid responses) which, in rare instances, were severe (e.g., cardiac arrest) Musculoskeletal: Inadequate block, prolonged block Cardiovascular: Hypotension, vasodilatation (flushing), tachycardia, bradycardia Respiratory: Dyspnea, bronchospasm, laryngospasm Integumentary: Rash, urticaria, reaction at injection site There have been rare spontaneous reports of seizures in ICU patients following long-term infusion of atracurium to support mechanical ventilation. There are insufficient data to define the contribution, if any, of atracurium and/or its metabolite laudanosine. (See PRECAUTIONS: Long-Term Use in Intensive Care Unit (ICU)). There have been post-marketing reports of severe allergic reactions (anaphylactic and anaphylactoid reactions) associated with use of neuromuscular blocking agents, including atracurium besylate. These reactions, in some cases, have been life-threatening and fatal. Because these reactions were reported voluntarily from population of uncertain size, it is not possible to reliably estimate their frequency (see WARNINGS and PRECAUTIONS).

CLINICAL PHARMACOLOGY SECTION.

CLINICAL PHARMACOLOGY. Atracurium besylate is nondepolarizing skeletal muscle relaxant. Nondepolarizing agents antagonize the neurotransmitter action of acetylcholine by binding competitively with cholinergic receptor sites on the motor end-plate. This antagonism is inhibited, and neuromuscular block reversed, by acetylcholinesterase inhibitors such as neostigmine, edrophonium, and pyridostigmine. Atracurium can be used most advantageously if muscle twitch response to peripheral nerve stimulation is monitored to assess degree of muscle relaxation. The duration of neuromuscular block produced by atracurium is approximately one-third to one-half the duration of block by d--tubocurarine, metocurine, and pancuronium at initially equipotent doses. As with other nondepolarizing neuromuscular blockers, the time to onset of paralysis decreases and the duration of maximum effect increases with increasing atracurium doses. The ED95 (dose required to produce 95% suppression of the muscle twitch response with balanced anesthesia) has averaged 0.23 mg/kg (0.11 to 0.26 mg/kg in various studies). An initial atracurium dose of 0.4 to 0.5 mg/kg generally produces maximum neuromuscular block within to minutes of injection, with good or excellent intubation conditions within to 2.5 minutes in most patients. Recovery from neuromuscular block (under balanced anesthesia) can be expected to begin approximately 20 to 35 minutes after injection. Under balanced anesthesia, recovery to 25% of control is achieved approximately 35 to 45 minutes after injection, and recovery is usually 95% complete approximately 60 to 70 minutes after injection. The neuromuscular blocking action of atracurium is enhanced in the presence of potent inhalation anesthetics. Isoflurane and enflurane increase the potency of atracurium and prolong neuromuscular block by approximately 35%; however, halothanes potentiating effect (approximately 20%) is marginal (see DOSAGE AND ADMINISTRATION). Repeated administration of maintenance doses of atracurium has no cumulative effect on the duration of neuromuscular block if recovery is allowed to begin prior to repeat dosing. Moreover, the time needed to recover from repeat doses does not change with additional doses. Repeat doses can therefore be administered at relatively regular intervals with predictable results. After an initial dose of 0.4 to 0.5 mg/kg under balanced anesthesia, the first maintenance dose (suggested maintenance dose is 0.08 to 0.10 mg/kg) is generally required within 20 to 45 minutes, and subsequent maintenance doses are usually required at approximately 15 to 25 minute intervals. Once recovery from atracuriums neuromuscular blocking effects begins, it proceeds more rapidly than recovery from d-tubocurarine, metocurine, and pancuronium. Regardless of the atracurium dose, the time from start of recovery (from complete block) to complete (95%) recovery is approximately 30 minutes under balanced anesthesia, and approximately 40 minutes under halothane, enflurane or isoflurane. Repeated doses have no cumulative effect on recovery rate. Reversal of neuromuscular block produced by atracurium can be achieved with an anticholinesterase agent such as neostigmine, edrophonium, or pyridostigmine, in conjunction with an anticholinergic agent such as atropine or glycopyrrolate. Under balanced anesthesia, reversal can usually be attempted approximately 20 to 35 minutes after an initial atracurium besylate dose of 0.4 to 0.5 mg/kg, or approximately 10 to 30 minutes after 0.08 to 0.10 mg/kg maintenance dose, when recovery of muscle twitch has started. Complete reversal is usually attained within to 10 minutes of the administration of reversing agents. Rare instances of breathing difficulties, possibly related to incomplete reversal, have been reported following attempted pharmacologic antagonism of atracurium--induced neuromuscular block. As with other agents in this class, the tendency for residual neuromuscular block is increased if reversal is attempted at deep levels of block or if inadequate doses of reversal agents are employed. The pharmacokinetics of atracurium in humans are essentially linear within the 0.3 to 0.6 mg/kg dose range. The elimination half-life is approximately 20 minutes. THE DURATION OF NEUROMUSCULAR BLOCK PRODUCED BY ATRACURIUM BESYLATE DOES NOT CORRELATE WITH PLASMA PSEUDOCHOLINESTERASE LEVELS AND IS NOT ALTERED BY THE ABSENCE OF RENAL FUNCTION. This is consistent with the results of in vitro studies which have shown that atracurium is inactivated in plasma via two nonoxidative pathways: ester hydrolysis, catalyzed by nonspecific esterases; and Hofmann elimination, nonenzymatic chemical process which occurs at physiological pH. Some placental transfer occurs in humans. Radiolabel studies demonstrated that atracurium undergoes extensive degradation in cats, and that neither kidney nor liver plays major role in this elimination. Biliary and urinary excretion were the major routes of excretion of radioactivity (totaling >90% of the labeled dose within hours of dosing), of which atracurium represented only minor fraction. The metabolites in bile and urine were similar, including products of Hofmann elimination and ester hydrolysis. Elderly patients may have slightly altered pharmacokinetic parameters compared to younger patients, with slightly decreased total plasma clearance which is offset by corresponding increase in volume of distribution. The net effect is that there has been no significant difference in clinical duration and recovery from neuromuscular block observed between elderly and younger patients receiving atracurium besylate. Atracurium is less potent histamine releaser than d-tubocurarine or metocurine. Histamine release is minimal with initial atracurium besylate doses up to 0.5 mg/kg, and hemodynamic changes are minimal within the recommended dose range. moderate histamine release and significant falls in blood pressure have been seen following 0.6 mg/kg of atracurium besylate. The histamine and hemodynamic responses were poorly correlated. The effects were generally short-lived and manageable, but the possibility of substantial histamine release in sensitive individuals or in patients in whom substantial histamine release would be especially hazardous (e.g., patients with significant cardiovascular disease) must be considered. It is not known whether the prior use of other nondepolarizing neuromuscular blocking agents has any effect on the activity of atracurium. The prior use of succinylcholine decreases by approximately to minutes the time to maximum block induced by atracurium besylate, and may increase the depth of block. Atracurium should be administered only after patient recovers from succinylcholine-induced neuromuscular block.

DOSAGE & ADMINISTRATION SECTION.

DOSAGE AND ADMINISTRATION. To avoid distress to the patient, atracurium should not be administered before unconsciousness has been induced. Atracurium should not be mixed in the same syringe, or administered simultaneously through the same needle, with alkaline solutions (e.g., barbiturate solutions). Atracurium besylate should be administered intravenously. DO NOT GIVE ATRACURIUM BESYLATE BY INTRAMUSCULAR ADMINISTRATION. Intramuscular administration of atracurium besylate may result in tissue irritation and there are no clinical data to support this route of administration. As with other neuromuscular blocking agents, the use of peripheral nerve stimulator will permit the most advantageous use of atracurium besylate, minimizing the possibility of overdosage or underdosage, and assist in the evaluation of recovery. Bolus Doses for Intubation and Maintenance of Neuromuscular Block Adults An atracurium besylate dose of 0.4 to 0.5 mg/kg (1.7 to 2.2 times the ED95), given as an intravenous bolus injection, is the recommended initial dose for most patients. With this dose, good or excellent conditions for nonemergency intubation can be expected in to 2.5 minutes in most patients, with maximum neuromuscular block achieved approximately to minutes after injection. Clinically required neuromuscular block generally lasts 20 to 35 minutes under balanced anesthesia. Under balanced anesthesia, recovery to 25% of control is achieved approximately 35 to 45 minutes after injection, and recovery is usually 95% complete approximately 60 minutes after injection. Atracurium is potentiated by isoflurane or enflurane anesthesia. The same initial atracurium besylate dose of 0.4 to 0.5 mg/kg may be used for intubation prior to administration of these inhalation agents; however, if atracurium is first administered under steady-state of isoflurane or enflurane, the initial atracurium besylate dose should be reduced by approximately one-third, i.e., to 0.25 to 0.35 mg/kg, to adjust for the potentiating effects of these anesthetic agents. With halothane, which has only marginal (approximately 20%) potentiating effect on atracurium, smaller dosage reductions may be considered. Atracurium besylate doses of 0.08 to 0.1 mg/kg are recommended for maintenance of neuromuscular block during prolonged surgical procedures. The first maintenance dose will generally be required 20 to 45 minutes after the initial atracurium besylate injection, but the need for maintenance doses should be determined by clinical criteria. Because atracurium lacks cumulative effects, maintenance doses may be administered at relatively regular intervals for each patient, ranging approximately from 15 to 25 minutes under balanced anesthesia, slightly longer under isoflurane or enflurane. Higher atracurium doses (up to 0.2 mg/kg) permit maintenance dosing at longer intervals. Pediatric Patients No atracurium dosage adjustments are required for pediatric patients two years of age or older. An atracurium besylate dose of 0.3 to 0.4 mg/kg is recommended as the initial dose for infants (1 month to years of age) under halothane anesthesia. Maintenance doses may be required with slightly greater frequency in infants and children than in adults. Special Considerations An initial atracurium besylate dose of 0.3 to 0.4 mg/kg, given slowly or in divided doses over one minute, is recommended for adults, children, or infants with significant cardiovascular disease and for adults, children, or infants with any history (e.g., severe anaphylactoid reactions or asthma) suggesting greater risk of histamine release. Dosage reductions must be considered also in patients with neuromuscular disease, severe electrolyte disorders, or carcinomatosis in which potentiation of neuromuscular block or difficulties with reversal have been demonstrated. There has been no clinical experience with atracurium in these patients, and no specific dosage adjustments can be recommended. No atracurium dosage adjustments are required for patients with renal disease. An initial atracurium besylate dose of 0.3 to 0.4 mg/kg is recommended for adults following the use of succinylcholine for intubation under balanced anesthesia. Further reductions may be desirable with the use of potent inhalation anesthetics. The patient should be permitted to recover from the effects of succinylcholine prior to atracurium administration. Insufficient data are available for recommendation of specific initial atracurium dose for administration following the use of succinylcholine in children and infants. Use by Continuous Infusion Infusion in the Operating Room (OR) After administration of recommended initial bolus dose of atracurium besylate injection (0.3 to 0.5 mg/kg), diluted solution of atracurium besylate can be administered by continuous infusion to adults and pediatric patients aged or more years for maintenance of neuromuscular block during extended surgical procedures. Infusion of atracurium should be individualized for each patient. The rate of administration should be adjusted according to the patients response as determined by peripheral nerve stimulation. Accurate dosing is best achieved using precision infusion device. Infusion of atracurium should be initiated only after early evidence of spontaneous recovery from the bolus dose. An initial infusion rate of to 10 mcg/kg/min may be required to rapidly counteract the spontaneous recovery of neuromuscular function. Thereafter, rate of to mcg/kg/min should be adequate to maintain continuous neuromuscular block in the range of 89% to 99% in most pediatric and adult patients under balanced anesthesia. Occasional patients may require infusion rates as low as mcg/kg/min or as high as 15 mcg/kg/min. The neuromuscular blocking effect of atracurium administered by infusion is potentiated by enflurane or isoflurane and, to lesser extent, by halothane. Reduction in the infusion rate of atracurium should, therefore, be considered for patients receiving inhalation anesthesia. The rate of atracurium infusion should be reduced by approximately one-third in the presence of steady-state enflurane or isoflurane anesthesia; smaller reductions should be considered in the presence of halothane. In patients undergoing cardiopulmonary bypass with induced hypothermia, the rate of infusion of atracurium required to maintain adequate surgical relaxation during hypothermia (25 to 28C) has been shown to be approximately half the rate required during normothermia. Spontaneous recovery from neuromuscular block following discontinuation of atracurium infusion may be expected to proceed at rate comparable to that following administration of single bolus dose. Infusion in the Intensive Care Unit (ICU) The principles for infusion of atracurium in the OR are also applicable to use in the ICU. An infusion rate of 11 to 13 mcg/kg/min (range: 4.5 to 29.5) should provide adequate neuromuscular block in adult patients in an ICU. Limited information suggests that infusion rates required for pediatric patients in the ICU may be higher than in adult patients. There may be wide interpatient variability in dosage requirements and these requirements may increase or decrease with time (see PRECAUTIONS: Long-Term Use in Intensive Care Unit (ICU)). Following recovery from neuromuscular block, readministration of bolus dose may be necessary to quickly re-establish neuromuscular block prior to reinstitution of the infusion. Infusion Rate Tables The amount of infusion solution required per minute will depend upon the concentration of atracurium in the infusion solution, the desired dose of atracurium, and the patients weight. The following tables provide guidelines for delivery, in mL/hr (equivalent to microdrops/min when 60 microdrops 1 mL), of atracurium solutions in concentrations of 0.2 mg/mL (20 mg in 100 mL) or 0.5 mg/mL (50 mg in 100 mL) with an infusion pump or gravity flow device. Table 3: Atracurium Besylate Infusion Rates for Concentration of 0.2 mg/mL PatientWeight(kg)Drug Delivery Rate (mcg/kg/min)5 7 9 10 11 12 13 Infusion Delivery Rate (mL/hr)30 45 54 63 72 81 90 99 108 117 35 53 63 74 84 95 105 116 126 137 40 60 72 84 96 108 120 132 144 156 45 68 81 95 108 122 135 149 162 176 50 75 90 105 120 135 150 165 180 195 55 83 99 116 132 149 165 182 198 215 60 90 108 126 144 162 180 198 216 234 65 98 117 137 156 176 195 215 234 254 70 105 126 147 168 189 210 231 252 273 75 113 135 158 180 203 225 248 270 293 80 120 144 168 192 216 240 264 288 312 90 135 162 189 216 243 270 297 324 351 100 150 180 210 240 270 300 330 360 390 Table 4: Atracurium Besylate Infusion Rates for Concentration of 0.5 mg/mL PatientWeight(kg)Drug Delivery Rate (mcg/kg/min)5 7 9 10 11 12 13 Infusion Delivery Rate (mL/hr)30 18 22 25 29 32 36 40 43 47 35 21 25 29 34 38 42 46 50 55 40 24 29 34 38 43 48 53 58 62 45 27 32 38 43 49 54 59 65 70 50 30 36 42 48 54 60 66 72 78 55 33 40 46 53 59 66 73 79 86 60 36 43 50 58 65 72 79 86 94 65 39 47 55 62 70 78 86 94 101 70 42 50 59 67 76 84 92 101 109 75 45 54 63 72 81 90 99 108 117 80 48 58 67 77 86 96 106 115 125 90 54 65 76 86 97 108 119 130 140 100 60 72 84 96 108 120 132 144 156 Compatibility and Admixtures Atracurium besylate infusion solutions may be prepared by admixing atracurium besylate injection with an appropriate diluent such as 5% Dextrose Injection, 0.9% Sodium Chloride Injection, or 5% Dextrose and 0.9% Sodium Chloride Injection. Infusion solutions should be used within 24 hours of preparation. Unused solutions should be discarded. Solutions containing 0.2 mg/mL or 0.5 mg/mL atracurium besylate in the above diluents may be stored either under refrigeration or at room temperature for 24 hours without significant loss of potency. Care should be taken during admixture to prevent inadvertent contamination. Visually inspect prior to administration. Spontaneous degradation of atracurium besylate has been demonstrated to occur more rapidly in Lactated Ringers solution than in 0.9% sodium chloride solution. Therefore, it is recommended that Lactated Ringers Injection not be used as diluent in preparing solutions of atracurium besylate injection for infusion. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. Risk of Medication Errors: Accidental administration of neuromuscular blocking agents may be fatal. Store atracurium besylate injection with the cap and ferrule intact and in manner that minimizes the possibility of selecting the wrong product.

GENERAL PRECAUTIONS SECTION.

General. Although atracurium is less potent histamine releaser than d-tubocurarine or metocurine, the possibility of substantial histamine release in sensitive individuals must be considered. Special caution should be exercised in administering atracurium to patients in whom substantial histamine release would be especially hazardous (e.g., patients with clinically significant cardiovascular disease) and in patients with any history (e.g., severe anaphylactoid reactions or asthma) suggesting greater risk of histamine release. In these patients, the recommended initial atracurium besylate dose is lower (0.3 to 0.4 mg/kg) than for other patients and should be administered slowly or in divided doses over one minute. Since atracurium has no clinically significant effects on heart rate in the recommended dosage range, it will not counteract the bradycardia produced by many anesthetic agents or vagal stimulation. As result, bradycardia during anesthesia may be more common with atracurium than with other muscle relaxants. Atracurium may have profound effects in patients with myasthenia gravis, Eaton-Lambert syndrome, or other neuromuscular diseases in which potentiation of nondepolarizing agents has been noted. The use of peripheral nerve stimulator is especially important for assessing neuromuscular block in these patients. Similar precautions should be taken in patients with severe electrolyte disorders or carcinomatosis. Multiple factors in anesthesia practice are suspected of triggering malignant hyperthermia (MH), potentially fatal hypermetabolic state of skeletal muscle. Halogenated anesthetic agents and succinylcholine are recognized as the principal pharmacologic triggering agents in MH-susceptible patients; however, since MH can develop in the absence of established triggering agents, the clinician should be prepared to recognize and treat MH in any patient scheduled for general anesthesia. Reports of MH have been rare in cases in which atracurium has been used. In studies of MH-susceptible animals (swine) and in clinical study of MH-susceptible patients, atracurium did not trigger this syndrome. Resistance to nondepolarizing neuromuscular blocking agents may develop in burn patients. Increased doses of nondepolarizing muscle relaxants may be required in burn patients and are dependent on the time elapsed since the burn injury and the size of the burn. The safety of atracurium has not been established in patients with bronchial asthma. Long-Term Use in Intensive Care Unit (ICU) When there is need for long-term mechanical ventilation, the benefits-to-risk ratio of neuromuscular block must be considered. The long-term (1 to 10 days) infusion of atracurium besylate during mechanical ventilation in the ICU has been evaluated in several studies. Average infusion rates of 11 to 13 mcg/kg per minute (range: 4.5 to 29.5) were required to achieve adequate neuromuscular block. These data suggest that there is wide interpatient variability in dosage requirements. In addition, these studies have shown that dosage requirements may decrease or increase with time. Following discontinuation of infusion of atracurium besylate in these ICU studies, spontaneous recovery of four twitches in train-of-four occurred in an average of approximately 30 minutes (range: 15 to 75 minutes) and spontaneous recovery to train-of-four ratio >75% (the ratio of height of the fourth to the first twitch in train-of-four) occurred in an average of approximately 60 minutes (range: 32 to 108 minutes). Little information is available on the plasma levels and clinical consequences of atracurium metabolites that may accumulate during days to weeks of atracurium administration in ICU patients. Laudanosine, major biologically active metabolite of atracurium without neuromuscular blocking activity, produces transient hypotension and, in higher doses, cerebral excitatory effects (generalized muscle twitching and seizures) when administered to several species of animals. There have been rare spontaneous reports of seizures in ICU patients who have received atracurium or other agents. These patients usually had predisposing causes (such as head trauma, cerebral edema, hypoxic encephalopathy, viral encephalitis, uremia). There are insufficient data to determine whether or not laudanosine contributes to seizures in ICU patients. WHENEVER THE USE OF ATRACURIUM OR ANY NEUROMUSCULAR BLOCKING AGENT IS CONTEMPLATED IN THE ICU, IT IS RECOMMENDED THAT NEUROMUSCULAR TRANSMISSION BE MONITORED CONTINUOUSLY DURING ADMINISTRATION WITH THE HELP OF NERVE STIMULATOR. ADDITIONAL DOSES OF ATRACURIUM OR ANY OTHER NEUROMUSCULAR BLOCKING AGENT SHOULD NOT BE GIVEN BEFORE THERE IS DEFINITE RESPONSE TO T1 OR TO THE FIRST TWITCH. IF NO RESPONSE IS ELICITED, INFUSION ADMINISTRATION SHOULD BE DISCONTINUED UNTIL RESPONSE RETURNS. Hemofiltration has minimal effect on plasma levels of atracurium and its metabolites, including laudanosine. The effects of hemodialysis and hemoperfusion on plasma levels of atracurium and its metabolites are unknown.

OVERDOSAGE SECTION.

OVERDOSAGE. There has been limited experience with overdosage of atracurium besylate. The possibility of iatrogenic overdosage can be minimized by carefully monitoring muscle twitch response to peripheral nerve stimulation. Excessive doses of atracurium can be expected to produce enhanced pharmacological effects. Overdosage may increase the risk of histamine release and cardiovascular effects, especially hypotension. If cardiovascular support is necessary, this should include proper positioning, fluid administration, and the use of vasopressor agents if necessary. The patients airway should be assured, with manual or mechanical ventilation maintained as necessary. longer duration of neuromuscular block may result from overdosage and peripheral nerve stimulator should be used to monitor recovery. Recovery may be facilitated by administration of an anticholinesterase reversing agent such as neostigmine, edrophonium, or pyridostigmine, in conjunction with an anticholinergic agent such as atropine or glycopyrrolate. The appropriate package inserts should be consulted for prescribing information. Three pediatric patients (3 weeks, and months of age) unintentionally received doses of 0.8 mg/kg to mg/kg of atracurium besylate. The time to 25% recovery (50 to 55 minutes) following these doses, which were to times the ED95 dose, was moderately longer than the corresponding time observed following doses to 2.5 times the atracurium ED95 dose in infants (22 to 36 minutes). Cardiovascular changes were minimal. Nonetheless the possibility of cardiovascular changes must be considered in the case of overdose. An adult patient (17 years of age) unintentionally received an initial dose of 1.3 mg/kg of atracurium besylate. The time from injection to 25% recovery (83 minutes) was approximately twice that observed following maximum recommended doses in adults (35 to 45 minutes). The patient experienced moderate hemodynamic changes (13% increase in mean arterial pressure and 27% increase in heart rate) which persisted for 40 minutes and did not require treatment. The intravenous LD50s determined in non-ventilated male and female albino mice and male Wistar rats were 1.9, 2.01 and 1.31 mg/kg, respectively. Deaths occurred within minutes and were caused by respiratory paralysis. The subcutaneous LD50 determined in non-ventilated male Wistar rats was 282.8 mg/kg. Tremors, ptosis, loss of reflexes and respiratory failure preceded death which occurred 45 to 120 minutes after injection.

PRECAUTIONS SECTION.

PRECAUTIONS. Since allergic cross-reactivity has been reported in this class, request information from your patients about previous anaphylactic reactions to other neuromuscular blocking agents. In addition, inform your patients that severe anaphylactic reactions to neuromuscular blocking agents, including atracurium besylate have been reported.. General. Although atracurium is less potent histamine releaser than d-tubocurarine or metocurine, the possibility of substantial histamine release in sensitive individuals must be considered. Special caution should be exercised in administering atracurium to patients in whom substantial histamine release would be especially hazardous (e.g., patients with clinically significant cardiovascular disease) and in patients with any history (e.g., severe anaphylactoid reactions or asthma) suggesting greater risk of histamine release. In these patients, the recommended initial atracurium besylate dose is lower (0.3 to 0.4 mg/kg) than for other patients and should be administered slowly or in divided doses over one minute. Since atracurium has no clinically significant effects on heart rate in the recommended dosage range, it will not counteract the bradycardia produced by many anesthetic agents or vagal stimulation. As result, bradycardia during anesthesia may be more common with atracurium than with other muscle relaxants. Atracurium may have profound effects in patients with myasthenia gravis, Eaton-Lambert syndrome, or other neuromuscular diseases in which potentiation of nondepolarizing agents has been noted. The use of peripheral nerve stimulator is especially important for assessing neuromuscular block in these patients. Similar precautions should be taken in patients with severe electrolyte disorders or carcinomatosis. Multiple factors in anesthesia practice are suspected of triggering malignant hyperthermia (MH), potentially fatal hypermetabolic state of skeletal muscle. Halogenated anesthetic agents and succinylcholine are recognized as the principal pharmacologic triggering agents in MH-susceptible patients; however, since MH can develop in the absence of established triggering agents, the clinician should be prepared to recognize and treat MH in any patient scheduled for general anesthesia. Reports of MH have been rare in cases in which atracurium has been used. In studies of MH-susceptible animals (swine) and in clinical study of MH-susceptible patients, atracurium did not trigger this syndrome. Resistance to nondepolarizing neuromuscular blocking agents may develop in burn patients. Increased doses of nondepolarizing muscle relaxants may be required in burn patients and are dependent on the time elapsed since the burn injury and the size of the burn. The safety of atracurium has not been established in patients with bronchial asthma. Long-Term Use in Intensive Care Unit (ICU) When there is need for long-term mechanical ventilation, the benefits-to-risk ratio of neuromuscular block must be considered. The long-term (1 to 10 days) infusion of atracurium besylate during mechanical ventilation in the ICU has been evaluated in several studies. Average infusion rates of 11 to 13 mcg/kg per minute (range: 4.5 to 29.5) were required to achieve adequate neuromuscular block. These data suggest that there is wide interpatient variability in dosage requirements. In addition, these studies have shown that dosage requirements may decrease or increase with time. Following discontinuation of infusion of atracurium besylate in these ICU studies, spontaneous recovery of four twitches in train-of-four occurred in an average of approximately 30 minutes (range: 15 to 75 minutes) and spontaneous recovery to train-of-four ratio >75% (the ratio of height of the fourth to the first twitch in train-of-four) occurred in an average of approximately 60 minutes (range: 32 to 108 minutes). Little information is available on the plasma levels and clinical consequences of atracurium metabolites that may accumulate during days to weeks of atracurium administration in ICU patients. Laudanosine, major biologically active metabolite of atracurium without neuromuscular blocking activity, produces transient hypotension and, in higher doses, cerebral excitatory effects (generalized muscle twitching and seizures) when administered to several species of animals. There have been rare spontaneous reports of seizures in ICU patients who have received atracurium or other agents. These patients usually had predisposing causes (such as head trauma, cerebral edema, hypoxic encephalopathy, viral encephalitis, uremia). There are insufficient data to determine whether or not laudanosine contributes to seizures in ICU patients. WHENEVER THE USE OF ATRACURIUM OR ANY NEUROMUSCULAR BLOCKING AGENT IS CONTEMPLATED IN THE ICU, IT IS RECOMMENDED THAT NEUROMUSCULAR TRANSMISSION BE MONITORED CONTINUOUSLY DURING ADMINISTRATION WITH THE HELP OF NERVE STIMULATOR. ADDITIONAL DOSES OF ATRACURIUM OR ANY OTHER NEUROMUSCULAR BLOCKING AGENT SHOULD NOT BE GIVEN BEFORE THERE IS DEFINITE RESPONSE TO T1 OR TO THE FIRST TWITCH. IF NO RESPONSE IS ELICITED, INFUSION ADMINISTRATION SHOULD BE DISCONTINUED UNTIL RESPONSE RETURNS. Hemofiltration has minimal effect on plasma levels of atracurium and its metabolites, including laudanosine. The effects of hemodialysis and hemoperfusion on plasma levels of atracurium and its metabolites are unknown.. Drug Interactions. Drugs which may enhance the neuromuscular blocking action of atracurium include: enflurane; isoflurane; halothane; certain antibiotics, especially the aminoglycosides and polymyxins; lithium; magnesium salts; procainamide; and quinidine. If other muscle relaxants are used during the same procedure, the possibility of synergistic or antagonist effect should be considered. The prior administration of succinylcholine does not enhance the duration, but quickens the onset and may increase the depth, of neuromuscular block induced by atracurium besylate. Atracurium should not be administered until patient has recovered from succinylcholine-induced neuromuscular block.. Carcinogenesis, Mutagenesis, Impairment of Fertility. Carcinogenesis and fertility studies have not been performed. Atracurium was evaluated in battery of three short-term mutagenicity tests. It was non-mutagenic in both the Ames Salmonella assay at concentrations up to 1,000 mcg/plate, and in rat bone marrow cytogenicity assay at up to paralyzing doses. positive response was observed in the mouse lymphoma assay under conditions (80 and 100 mcg/mL, in the absence of metabolic activation) which killed over 80% of the treated cells; there was no mutagenicity at 60 mcg/mL and lower, concentrations which killed up to half of the treated cells. far weaker response was observed in the presence of metabolic activation at concentrations (1,200 mcg/mL and higher) which also killed over 80% of the treated cells. Mutagenicity testing is intended to simulate chronic (years to lifetime) exposure in an effort to determine potential carcinogenicity. Thus, single positive mutagenicity response for drug used infrequently and/or briefly is of questionable clinical relevance.. Pregnancy. Teratogenic Effects: Atracurium besylate has been shown to be potentially teratogenic in rabbits when given in doses up to approximately one-half the human dose. There are no adequate and well-controlled studies in pregnant women. Atracurium should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus. Atracurium besylate was administered subcutaneously on days through 18 of gestation to non-ventilated Dutch rabbits. Treatment groups were given either 0.15 mg/kg once daily or 0.10 mg/kg twice daily. Lethal respiratory distress occurred in two 0.15 mg/kg animals and in one 0.10 mg/kg animal, with transient respiratory distress or other evidence of neuromuscular block occurring in 10 of 19 and in of 20 of the 0.15 mg/kg and 0.10 mg/kg animals, respectively. There was an increased incidence of certain spontaneously occurring visceral and skeletal anomalies or variations in one or both treated groups when compared to non-treated controls. The percentage of male fetuses was lower (41% vs. 51%) and the post-implantation losses were increased (15% vs. 8%) in the group given 0.15 mg/kg once daily when compared to the controls; the mean numbers of implants (6.5 vs. 4.4) and normal live fetuses (5.4 vs. 3.8) were greater in this group when compared to the control group.. Labor and Delivery. It is not known whether muscle relaxants administered during vaginal delivery have immediate or delayed adverse effects on the fetus or increase the likelihood that resuscitation of the newborn will be necessary. The possibility that forceps delivery will be necessary may increase. Atracurium besylate (0.3 mg/kg) has been administered to 26 pregnant women during delivery by cesarean section. No harmful effects were attributable to atracurium in any of the neonates, although small amounts of atracurium were shown to cross the placental barrier. The possibility of respiratory depression in the neonate should always be considered following cesarean section during which neuromuscular blocking agent has been administered. In patients receiving magnesium sulfate, the reversal of neuromuscular block may be unsatisfactory and the dose of atracurium besylate should be lowered as indicated.. Nursing Mothers. It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when atracurium besylate is administered to nursing woman.. Pediatric Use. Safety and effectiveness in pediatric patients below the age of month have not been established.. Geriatric Use. Since marketing in 1983, uncontrolled clinical experience and limited data from controlled trials have not identified differences in effectiveness, safety, or dosage requirements between healthy elderly and younger patients (see CLINICAL PHARMACOLOGY); however, as with other neuromuscular blocking agents, the use of peripheral nerve stimulator to monitor neuromuscular function is suggested (see DOSAGE AND ADMINISTRATION).

WARNINGS SECTION.

WARNINGS. ATRACURIUM SHOULD BE USED ONLY BY THOSE SKILLED IN AIRWAY MANAGEMENT AND RESPIRATORY SUPPORT. EQUIPMENT AND PERSONNEL MUST BE IMMEDIATELY AVAILABLE FOR ENDOTRACHEAL INTUBATION AND SUPPORT OF VENTILATION, INCLUDING ADMINISTRATION OF POSITIVE PRESSURE OXYGEN. ADEQUACY OF RESPIRATION MUST BE ASSURED THROUGH ASSISTED OR CONTROLLED VENTILATION. ANTICHOLINESTERASE REVERSAL AGENTS SHOULD BE IMMEDIATELY AVAILABLE. DO NOT GIVE ATRACURIUM BESYLATE BY INTRAMUSCULAR ADMINISTRATION. Atracurium has no known effect on consciousness, pain threshold, or cerebration. It should be used only with adequate anesthesia. Atracurium besylate injection, which has an acid pH, should not be mixed with alkaline solutions (e.g., barbiturate solutions) in the same syringe or administered simultaneously during intravenous infusion through the same needle. Depending on the resultant pH of such mixtures, atracurium may be inactivated and free acid may be precipitated. Atracurium besylate injection 10 mL multiple dose vials contain benzyl alcohol. In neonates, benzyl alcohol has been associated with an increased incidence of neurological and other complications which are sometimes fatal. Atracurium besylate mL single-dose vials do not contain benzyl alcohol (see PRECAUTIONS: Pediatric Use). Anaphylaxis Severe anaphylactic reactions to neuromuscular blocking agents, including atracurium besylate, have been reported. These reactions have in some cases been life-threatening and fatal. Due to the potential severity of these reactions, the necessary precautions, such as the immediate availability of appropriate emergency treatment, should be taken. Precautions should also be taken in those individuals who have had previous anaphylactic reactions to other neuromuscular blocking agents since cross-reactivity between neuromuscular blocking agents, both depolarizing and non-depolarizing, has been reported in this class of drugs.. Risk of Death due to Medication Errors. Administration of atracurium besylate results in paralysis, which may lead to respiratory arrest and death; this progression may be more likely to occur in patient for whom it is not intended. Confirm proper selection of intended product and avoid confusion with other injectable solutions that are present in critical care and other clinical settings. If another healthcare provider is administering the product, ensure that the intended dose is clearly labeled and communicated.