ADVERSE REACTIONS SECTION.

6 ADVERSE REACTIONS. The following adverse reactions associated with the use of vasopressin were identified in the literature. Because these reactions are reported voluntarily from population of uncertain size, it is not possible to estimate their frequency reliably or to establish causal relationship to drug exposure.Bleeding/lymphatic system disorders: Hemorrhagic shock, decreased platelets, intractable bleedingCardiac disorders: Right heart failure, atrial fibrillation, bradycardia, myocardial ischemiaGastrointestinal disorders: Mesenteric ischemiaHepatobiliary: Increased bilirubin levelsRenal/urinary disorders: Acute renal insufficiencyVascular disorders: Distal limb ischemiaMetabolic: Hyponatremia Skin: Ischemic lesionsPost-marketing Experience Reversible diabetes insipidus [see Warnings and Precautions (5.2)].. The most common adverse reactions include decreased cardiac output, bradycardia, tachyarrhythmias, hyponatremia and ischemia (coronary, mesenteric, skin, digital). (6) To report SUSPECTED ADVERSE REACTIONS, contact Amneal Pharmaceuticals at 1-877-835-5472 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

CLINICAL PHARMACOLOGY SECTION.

12 CLINICAL PHARMACOLOGY. 12.1 Mechanism of Action. Vasopressin causes vasoconstriction by binding to V1 receptors on vascular smooth muscle coupled to the Gq/11-phospholipase C-phosphatidyl-inositol-triphosphate pathway, resulting in the release of intracellular calcium. In addition, vasopressin stimulates antidiuresis via stimulation of V2 receptors which are coupled to adenyl cyclase.. 12.2 Pharmacodynamics. At therapeutic doses exogenous vasopressin elicits vasoconstrictive effect in most vascular beds including the splanchnic, renal and cutaneous circulation. In addition, vasopressin at pressor doses triggers contractions of smooth muscles in the gastrointestinal tract mediated by muscular V1-receptors and release of prolactin and ACTH via V3 receptors. At lower concentrations typical for the antidiuretic hormone vasopressin inhibits water diuresis via renal V2 receptors. In addition, vasopressin has been demonstrated to cause vasodilation in numerous vascular beds that are mediated by V2, V3, oxytocin and purinergic P2 receptors.In patients with vasodilatory shock vasopressin in therapeutic doses increases systemic vascular resistance and mean arterial blood pressure and reduces the dose requirements for norepinephrine. Vasopressin tends to decrease heart rate and cardiac output. The pressor effect is proportional to the infusion rate of exogenous vasopressin. The pressor effect reaches its peak within 15 minutes. After stopping the infusion the pressor effect fades within 20 minutes. There is no evidence for tachyphylaxis or tolerance to the pressor effect of vasopressin in patients.. 12.3 Pharmacokinetics. Vasopressin plasma concentrations increase linearly with increasing infusion rates from 10 to 200 uU/kg/min. Steady state plasma concentrations are achieved after 30 minutes of continuous intravenous infusion.Distribution Vasopressin does not appear to bind plasma protein. The volume of distribution is 140 mL/kg.EliminationAt infusion rates used in vasodilatory shock (0.01 to 0.1 units/minute), the clearance of vasopressin is to 25 mL/min/kg in patients with vasodilatory shock. The apparent t1/2 of vasopressin at these levels is <=10 minutes.MetabolismSerine protease, carboxipeptidase and disulfide oxido-reductase cleave vasopressin at sites relevant for the pharmacological activity of the hormone. Thus, the generated metabolites are not expected to retain important pharmacological activity.ExcretionVasopressin is predominantly metabolized and only about 6% of the dose is excreted unchanged into urine.Specific PopulationsPregnancy: Because of spillover into blood of placental vasopressinase, the clearance of exogenous and endogenous vasopressin increases gradually over the course of pregnancy. During the first trimester of pregnancy, the clearance is only slightly increased. However, by the third trimester the clearance of vasopressin is increased about 4-fold and at term up to 5-fold. After delivery, the clearance of vasopressin returns to pre-conception baseline within two weeks. Drug Interactions Indomethacin more than doubles the time to offset for vasopressins effect on peripheral vascular resistance and cardiac output in healthy subjects [see Drug Interactions (7.2)].The ganglionic blocking agent tetra-ethylammonium increases the pressor effect of vasopressin by 20% in healthy subjects [see Drug Interactions (7.3)].Halothane, morphine, fentanyl, alfentanyl and sufentanyl do not impact exposure to endogenous vasopressin.

CONTRAINDICATIONS SECTION.

4 CONTRAINDICATIONS. Vasopressin injection 10 mL multiple dose vial is contraindicated in patients with known allergy or hypersensitivity to 8-L-arginine vasopressin or chlorobutanol. The mL single-dose vial does not contain chlorobutanol and is therefore contraindicated only in patients with known allergy or hypersensitivity to 8-L-arginine vasopressin. Vasopressin injection 10 mL multiple dose vial is contraindicated in patients with known allergy or hypersensitivity to 8-L-arginine vasopressin or chlorobutanol. The mL single-dose vial does not contain chlorobutanol and is therefore contraindicated only in patients with known allergy or hypersensitivity to 8-L-arginine vasopressin. (4) Vasopressin injection 10 mL multiple dose vial is contraindicated in patients with known allergy or hypersensitivity to 8-L-arginine vasopressin or chlorobutanol. The mL single-dose vial does not contain chlorobutanol and is therefore contraindicated only in patients with known allergy or hypersensitivity to 8-L-arginine vasopressin. (4).

DESCRIPTION SECTION.

11 DESCRIPTION. Vasopressin is polypeptide hormone. Vasopressin Injection, USP is sterile, aqueous solution of synthetic arginine vasopressin for intravenous administration. The mL solution contains vasopressin, USP 20 units/mL, water for injection, lactic acid and sodium lactate buffer adjusted to pH of 3.5, and sodium hydroxide and/or hydrochloric acid may have been used for pH adjustment. The chemical name of vasopressin is L-cysteinyl-L-tyrosyl-L-phenylalanyl-L-glutaminyl-L-asparaginyl-L-cysteinyl-L-prolyl-L-arginyl-glycinamide (1->6)-disulfide. It is white to off-white powder or flakes, and it is very soluble in water. The structural formula is:Molecular Formula: C46H65N15O12S2 Molecular Weight: 1084.24 uOne mg is equivalent to 554 units.. st.

DOSAGE & ADMINISTRATION SECTION.

2 DOSAGE AND ADMINISTRATION. Dilute 20 units/mL single-dose vial contents with normal saline (0.9% sodium chloride) or 5% dextrose in water (D5W) to either 0.1 units/mL or unit/mL for intravenous administration. Discard unused diluted solution after 18 hours at room temperature or 24 hours under refrigeration. (2.1) Post-cardiotomy shock: 0.03 to 0.1 units/minute. (2.2) Septic shock: 0.01 to 0.07 units/minute. (2.2) Dilute 20 units/mL single-dose vial contents with normal saline (0.9% sodium chloride) or 5% dextrose in water (D5W) to either 0.1 units/mL or unit/mL for intravenous administration. Discard unused diluted solution after 18 hours at room temperature or 24 hours under refrigeration. (2.1) Post-cardiotomy shock: 0.03 to 0.1 units/minute. (2.2) Septic shock: 0.01 to 0.07 units/minute. (2.2) 2.1 Preparation of Solution. Inspect parenteral drug products for particulate matter and discoloration prior to use, whenever solution and container permit.Vasopressin Injection Solution for Dilution, 20 units/mL:Dilute vasopressin injection in normal saline (0.9% sodium chloride) or 5% dextrose in water (D5W) prior to use for intravenous administration. Discard unused diluted solution after 18 hours at room temperature or 24 hours under refrigeration.Table 1: Preparation of diluted solutionsFluid restrictionFinal concentrationMixVasopressin InjectionDiluentNo 0.1 units/mL2.5 mL (50 units)500 mL Yes1 unit/mL mL (100 units)100 mL. 2.2 Administration. In general, titrate to the lowest dose compatible with clinically acceptable response.The recommended starting dose is:Post-cardiotomy shock: 0.03 units/minuteSeptic Shock: 0.01 units/minuteTitrate up by 0.005 units/minute at 10- to 15-minute intervals until the target blood pressure is reached. There are limited data for doses above 0.1 units/minute for post-cardiotomy shock and 0.07 units/minute for septic shock. Adverse reactions are expected to increase with higher doses.After target blood pressure has been maintained for hours without the use of catecholamines, taper vasopressin injection by 0.005 units/minute every hour as tolerated to maintain target blood pressure.. Post-cardiotomy shock: 0.03 units/minute. Septic Shock: 0.01 units/minute.

DRUG INTERACTIONS SECTION.

7 DRUG INTERACTIONS. Pressor effects of catecholamines and vasopressin are expected to be additive. (7.1) Indomethacin may prolong effects of vasopressin. (7.2) Co-administration of ganglionic blockers or drugs causing SIADH may increase the pressor response. (7.3, 7.4)Co-administration of drugs causing diabetes insipidus may decrease the pressor response. (7.6) Pressor effects of catecholamines and vasopressin are expected to be additive. (7.1) Indomethacin may prolong effects of vasopressin. (7.2) Co-administration of ganglionic blockers or drugs causing SIADH may increase the pressor response. (7.3, 7.4). Co-administration of drugs causing diabetes insipidus may decrease the pressor response. (7.6) 7.1 Catecholamines. Use with catecholamines is expected to result in an additive effect on mean arterial blood pressure and other hemodynamic parameters. Hemodynamic monitoring is recommended; adjust the dose of vasopressin as needed.. 7.2 Indomethacin. Use with indomethacin may prolong the effect of vasopressin on cardiac index and systemic vascular resistance. Hemodynamic monitoring is recommended; adjust the dose of vasopressin as needed [see Clinical Pharmacology (12.3)]. 7.3 Ganglionic Blocking Agents. Use with ganglionic blocking agents may increase the effect of vasopressin on mean arterial blood pressure. Hemodynamic monitoring is recommended; adjust the dose of vasopressin as needed [see Clinical Pharmacology (12.3)]. 7.4 Drugs Suspected of Causing SIADH. Use with drugs suspected of causing SIADH (e.g., SSRIs, tricyclic antidepressants, haloperidol, chlorpropamide, enalapril, methyldopa, pentamidine, vincristine, cyclophosphamide, ifosfamide, felbamate) may increase the pressor effect in addition to the antidiuretic effect of vasopressin. Hemodynamic monitoring is recommended; adjust the dose of vasopressin as needed.. 7.5 DrugsSuspected of Causing Diabetes Insipidus. Use with drugs suspected of causing diabetes insipidus (e.g., demeclocycline, lithium, foscarnet, clozapine) may decrease the pressor effect in addition to the antidiuretic effect of vasopressin. Hemodynamic monitoring is recommended; adjust the dose of vasopressin as needed.

HOW SUPPLIED SECTION.

16 HOW SUPPLIED/STORAGE AND HANDLING. Vasopressin Injection, USP is supplied as clear, colorless solution for intravenous administration. Each mL single-dose vial contains vasopressin, USP 20 units/mL.20 units/mL (1 mL):1 mL single-dose vial: NDC 70121-1642-11 single-dose vial in carton: NDC 70121-1642-210 vials in carton: NDC 70121-1642-725 vials in carton: NDC 70121-1642-5Store between 2C to 8C (36F to 46F). Do not freeze.Vials may be held up to 12 months upon removal from refrigeration to room temperature storage conditions (20C to 25C [68F to 77F], USP Controlled Room Temperature), anytime within the labeled shelf life. Once removed from refrigeration, unopened vial should be marked to indicate the revised 12-month expiration date. If the manufacturers original expiration date is shorter than the revised expiration date, then the shorter date must be used. Do not use vasopressin injection, USP beyond the manufacturers expiration date printed on the vial.Discard prepared infusion solutions after 18 hours at room temperature or 24 hours refrigerated.The storage conditions and expiration periods are summarized in the following table. Unopened Refrigerated 2C to 8C(36F to 46F)Unopened Room Temperature 20C to 25C (68F to 77F)Do not store above 25C (77F)1 mL Vial Until manufacturer expiration date 12 months or until manufacturer expiration date, whichever is earlier Manufactured by:Amneal Pharmaceuticals Pvt. Ltd. Parenteral UnitAhmedabad 382213, INDIADistributed by:Amneal Pharmaceuticals LLCBridgewater, NJ 08807Rev. 07-2022-01.

PHARMACODYNAMICS SECTION.

12.2 Pharmacodynamics. At therapeutic doses exogenous vasopressin elicits vasoconstrictive effect in most vascular beds including the splanchnic, renal and cutaneous circulation. In addition, vasopressin at pressor doses triggers contractions of smooth muscles in the gastrointestinal tract mediated by muscular V1-receptors and release of prolactin and ACTH via V3 receptors. At lower concentrations typical for the antidiuretic hormone vasopressin inhibits water diuresis via renal V2 receptors. In addition, vasopressin has been demonstrated to cause vasodilation in numerous vascular beds that are mediated by V2, V3, oxytocin and purinergic P2 receptors.In patients with vasodilatory shock vasopressin in therapeutic doses increases systemic vascular resistance and mean arterial blood pressure and reduces the dose requirements for norepinephrine. Vasopressin tends to decrease heart rate and cardiac output. The pressor effect is proportional to the infusion rate of exogenous vasopressin. The pressor effect reaches its peak within 15 minutes. After stopping the infusion the pressor effect fades within 20 minutes. There is no evidence for tachyphylaxis or tolerance to the pressor effect of vasopressin in patients.

PHARMACOKINETICS SECTION.

12.3 Pharmacokinetics. Vasopressin plasma concentrations increase linearly with increasing infusion rates from 10 to 200 uU/kg/min. Steady state plasma concentrations are achieved after 30 minutes of continuous intravenous infusion.Distribution Vasopressin does not appear to bind plasma protein. The volume of distribution is 140 mL/kg.EliminationAt infusion rates used in vasodilatory shock (0.01 to 0.1 units/minute), the clearance of vasopressin is to 25 mL/min/kg in patients with vasodilatory shock. The apparent t1/2 of vasopressin at these levels is <=10 minutes.MetabolismSerine protease, carboxipeptidase and disulfide oxido-reductase cleave vasopressin at sites relevant for the pharmacological activity of the hormone. Thus, the generated metabolites are not expected to retain important pharmacological activity.ExcretionVasopressin is predominantly metabolized and only about 6% of the dose is excreted unchanged into urine.Specific PopulationsPregnancy: Because of spillover into blood of placental vasopressinase, the clearance of exogenous and endogenous vasopressin increases gradually over the course of pregnancy. During the first trimester of pregnancy, the clearance is only slightly increased. However, by the third trimester the clearance of vasopressin is increased about 4-fold and at term up to 5-fold. After delivery, the clearance of vasopressin returns to pre-conception baseline within two weeks. Drug Interactions Indomethacin more than doubles the time to offset for vasopressins effect on peripheral vascular resistance and cardiac output in healthy subjects [see Drug Interactions (7.2)].The ganglionic blocking agent tetra-ethylammonium increases the pressor effect of vasopressin by 20% in healthy subjects [see Drug Interactions (7.3)].Halothane, morphine, fentanyl, alfentanyl and sufentanyl do not impact exposure to endogenous vasopressin.

SPL UNCLASSIFIED SECTION.

2.1 Preparation of Solution. Inspect parenteral drug products for particulate matter and discoloration prior to use, whenever solution and container permit.Vasopressin Injection Solution for Dilution, 20 units/mL:Dilute vasopressin injection in normal saline (0.9% sodium chloride) or 5% dextrose in water (D5W) prior to use for intravenous administration. Discard unused diluted solution after 18 hours at room temperature or 24 hours under refrigeration.Table 1: Preparation of diluted solutionsFluid restrictionFinal concentrationMixVasopressin InjectionDiluentNo 0.1 units/mL2.5 mL (50 units)500 mL Yes1 unit/mL mL (100 units)100 mL.

USE IN SPECIFIC POPULATIONS SECTION.

8 USE IN SPECIFIC POPULATIONS. Pregnancy: May induce uterine contractions. (8.1)Pediatric Use: Safety and effectiveness have not been established. (8.4)Geriatric Use: No safety issues have been identified in older patients. (8.5). Pregnancy: May induce uterine contractions. (8.1). Pediatric Use: Safety and effectiveness have not been established. (8.4). Geriatric Use: No safety issues have been identified in older patients. (8.5). 8.1 Pregnancy. Risk SummaryThere are no available data on vasopressin use in pregnant women to inform drug associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes.Animal reproduction studies have not been conducted with vasopressin. Clinical ConsiderationsDose adjustments during pregnancy and the postpartum period: Because of increased clearance of vasopressin in the second and third trimester, the dose of vasopressin may need to be increased [see Dosage and Administration (2.2) and Clinical Pharmacology (12.3)].Maternal adverse reactions: Vasopressin may produce tonic uterine contractions that could threaten the continuation of pregnancy.. 8.2 Lactation. There are no data on the presence of vasopressin injection in either human or animal milk, the effects on the breastfed infant, or the effects on milk production.. 8.4 Pediatric Use. Safety and effectiveness of vasopressin in pediatric patients with vasodilatory shock have not been established.. 8.5 Geriatric Use. Clinical studies of vasopressin did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy [see Warnings and Precautions (5), Adverse Reactions (6), and Clinical Pharmacology (12.3)].

WARNINGS AND PRECAUTIONS SECTION.

5 WARNINGS AND PRECAUTIONS. Can worsen cardiac function. (5.1) Reversible diabetes insipidus. (5.2) Can worsen cardiac function. (5.1) Reversible diabetes insipidus. (5.2) 5.1 Worsening Cardiac Function. decrease in cardiac index may be observed with the use of vasopressin.. 5.2 Reversible Diabetes Insipidus. Patients may experience reversible diabetes insipidus, manifested by the development of polyuria, dilute urine, and hypernatremia, after cessation of treatment with vasopressin. Monitor serum electrolytes, fluid status and urine output after vasopressin discontinuation. Some patients may require readministration of vasopressin or administration of desmopressin to correct fluid and electrolyte shifts.