Phenylephrine hydrochloride

6 ADVERSE REACTIONS The following adverse reactions associated with the use of phenylephrine hydrochloride were identified in the literature. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to estimate their frequency reliably or to establish a causal relationship to drug exposure. Cardiac disorders: Bradycardia, AV block, ventricular extrasystoles, myocardial ischemia Gastrointestinal disorders: Nausea, vomiting General disorders and administrative site conditions: Chest pain, extravasation Immune system disorders: Sulfite sensitivity Nervous system disorders: Headache, nervousness, paresthesia, tremor Psychiatric disorders: Excitability Respiratory: Pulmonary edema, rales Skin and subcutaneous tissue disorders: Diaphoresis, pallor, piloerection, skin blanching, skin necrosis with extravasation Vascular disorders: Hypertensive crisis Most common adverse reactions: nausea and vomiting, headache, nervousness ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Avet Pharmaceuticals Inc. at 1-866-901-DRUG (3784) or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch .

4 CONTRAINDICATIONS The use of phenylephrine hydrochloride is contraindicated in patients with: Hypersensitivity to it or any of its components Hypersensitivity to it or any of its components ( 4 )

11 DESCRIPTION Phenylephrine hydrochloride is a synthetic sympathomimetic agent in sterile form for parenteral injection. Chemically, phenylephrine hydrochloride is (-)- m -Hydroxy-α-[(methylamino)methyl]benzyl alcohol hydrochloride and has the following structural formula: Phenylephrine hydrochloride is freely soluble in water and ethanol. Phenylephrine hydrochloride is sensitive to light. Phenylephrine Hydrochloride Injection, USP is a clear, colorless solution essentially free of visible particles. Each mL contains: phenylephrine hydrochloride USP 10 mg; sodium chloride USP 3.5 mg; sodium citrate dehydrate USP 4 mg; citric acid monohydrate USP 1 mg; and sodium metabisulfite NF 2 mg in water for injection. The pH may be adjusted in the range of 3.0 to 6.5 with sodium hydroxide NF and/or hydrochloric acid NF, if necessary. structure

2 DOSAGE AND ADMINISTRATION Dilute before administration. ( 2.1 ) Dosing for Perioperative Hypotension Intravenous bolus administration: 50 mcg to 250 mcg ( 2.4 ) Intravenous continuous infusion: 0.5 mcg/kg/minute to 1.4 mcg/kg/minute titrated to effect ( 2.4 ) Dosing for Patients with Vasodilatory Shock Intravenous continuous infusion: 0.5 mcg/kg/minute to 6 mcg/kg/minute titrated to effect ( 2.5 ) 2.1 General Administration Instructions Phenylephrine hydrochloride must be diluted before administration as bolus intravenous infusion or continuous intravenous infusion. Inspect the solution for particulate matter and discoloration prior to administration. The diluted solution should not be held for more than 4 hours at room temperature or for more than 24 hours under refrigerated conditions. Discard any unused portion. During phenylephrine hydrochloride administration: Correct intravascular volume depletion. Correct acidosis. Acidosis may reduce the effectiveness of phenylephrine. 2.2 Preparing a 100 mcg/mL Solution for Bolus Intravenous Administration For bolus intravenous administration, withdraw 10 mg (1 mL of a 10 mg/mL concentration) of phenylephrine injection and dilute with 99 mL of 5% Dextrose Injection, USP or 0.9% Sodium Chloride Injection, USP. This will yield a final concentration of 100 mcg/mL. Withdraw an appropriate dose from the 100 mcg/mL solution prior to bolus intravenous administration. 2.3 Preparing a Solution for Continuous Intravenous Infusion For continuous intravenous infusion, withdraw 10 mg (1 mL of 10 mg/mL concentration) of phenylephrine hydrochloride injection and add to 500 mL of 5% Dextrose Injection, USP or 0.9% Sodium Chloride Injection, USP (providing a final concentration of 20 mcg/mL). 2.4 Dosing for Perioperative Setting In adult patients undergoing surgical procedures with either neuraxial anesthesia or general anesthesia: 50 mcg to 250 mcg by intravenous bolus administration. The most frequently reported initial bolus dose is 50 mcg or 100 mcg. 0.5 mcg/kg/min to 1.4 mcg/kg/min by intravenous continuous infusion titrated to blood pressure goal. 2.5 Dosing for Septic or Other Vasodilatory Shock In adult patients with septic or other vasodilatory shock: No bolus. 0.5 mcg/kg/min to 6 mcg/kg/min by intravenous continuous infusion, titrated to blood pressure goal. Doses above 6 mcg/kg/min do not show significant incremental increase in blood pressure.

1 INDICATIONS AND USAGE Phenylephrine Hydrochloride is an alpha-1 adrenergic receptor agonist indicated for increasing blood pressure in adults with clinically important hypotension resulting primarily from vasodilation, in such settings as septic shock or anesthesia. Phenylephrine Hydrochloride is an alpha-1 adrenergic receptor agonist indicated for increasing blood pressure in adults with clinically important hypotension resulting primarily from vasodilation, in such settings as septic shock or anesthesia. ( 1 )

10 OVERDOSAGE Overdose of phenylephrine hydrochloride can cause a rapid rise in blood pressure. Symptoms of overdose include headache, vomiting, hypertension, reflex bradycardia, and cardiac arrhythmias including ventricular extrasystoles and ventricular tachycardia, and may cause a sensation of fullness in the head and tingling of the extremities. Consider using an α-adrenergic antagonist.

7 DRUG INTERACTIONS Agonistic effects with monoamine oxidase inhibitors (MAOI), β-adrenergic blocking agents, α-2 adrenergic agonists, steroids, tricyclic antidepressants, norepinephrine transport inhibitors, ergot alkaloids, centrally-acting sympatholytic agents and atropine sulfate (7.1 ) Antagonistic effects on and by α-adrenergic blocking agents ( 7.2 ) 7.1 Agonists The pressor effect of phenylephrine hydrochloride is increased in patients receiving: Monoamine oxidase inhibitors (MAOI), such as selegiline. β-adrenergic blockers α-2 adrenergic agonists, such as clonidine Steroids Tricyclic antidepressants Norepinephrine transport inhibitors, such as atomoxetine Ergot alkaloids, such as methylergonovine maleate Centrally-acting sympatholytic agents, such as guanfacine or reserpine Atropine sulfate 7.2 Antagonists α-adrenergic blocking agents, including phenothiazines (e.g., chlorpromazine) and amiodarone block phenylephrine and are in turn blocked by phenylephrine.

12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Phenylephrine hydrochloride is an α-1 adrenergic receptor agonist. 12.2 Pharmacodynamics Phenylephrine is the active moiety. Metabolites are inactive at both the α-1and α-2 adrenergic receptors. Following parenteral administration of phenylephrine hydrochloride, increases in systolic blood pressure, diastolic blood pressure, mean arterial blood pressure, and total peripheral vascular resistance are observed. The onset of blood pressure increase following an intravenous bolus phenylephrine hydrochloride administration is rapid and the effect may persist for up to 20 minutes. As mean arterial pressure increases following parenteral doses, vagal activity also increases, resulting in reflex bradycardia. Most vascular beds are constricted, including renal, splanchnic, and hepatic. 12.3 Pharmacokinetics Following an intravenous infusion of phenylephrine hydrochloride, the effective half-life was approximately 5 minutes. The steady-state volume of distribution (340 L) exceeded the body volume by a factor of 5, suggesting a high distribution into certain organ compartments. The average total serum clearance (2095 mL/min) was close to one-third of the cardiac output. A mass balance study showed that phenylephrine is extensively metabolized by the liver with only 12% of the dose excreted unchanged in the urine. Deamination by monoamino oxidase is the primary metabolic pathway resulting in the formation of the major metabolite (m-hydroxymandelic acid) which accounts for 57% of the total administered dose.

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3 DOSAGE FORMS AND STRENGTHS Injection: 10 mg/mL phenylephrine hydrochloride is supplied in one vial size: 1 mL single dose vial (10 mg of phenylephrine hydrochloride per vial) Injection: 10 mg/mL supplied as a 1 mL single dose vial ( 3 , 11 , 16 )

phenylephrine hydrochloride phenylephrine hydrochloride PHENYLEPHRINE HYDROCHLORIDE PHENYLEPHRINE SODIUM CHLORIDE CITRIC ACID MONOHYDRATE TRISODIUM CITRATE DIHYDRATE WATER SODIUM METABISULFITE SODIUM HYDROXIDE HYDROCHLORIC ACID

ANDA209968

Phenylephrine hydrochloride

phenylephrine hydrochloride

23155-620

HUMAN PRESCRIPTION DRUG

INTRAVENOUS

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL NDC 23155- 620 -31 Phenylephrine HCl Injection, USP 10 mg/mL For Intravenous Use Dilute Before Use 1 mL Single Dose Vial DISCARD UNUSED PORTION PROTECT FROM LIGHT NDC 23155 -620- 41 Phenylephrine HCl Injection, USP 10 mg/mL For Intravenous Use Dilute Before Use 25 x 1 mL Single Dose Vials DISCARD UNUSED PORTION label carton

17 PATIENT COUNSELING INFORMATION Inform patients, families, or caregivers that the primary side effect of phenylephrine is hypertension and rarely, hypertensive crisis. Patients may experience bradycardia (slow heart rate), which in some cases may produce heart block or other cardiac arrhythmias, extra ventricular beats, myocardial ischemia in patients with underlying cardiac disease, and pulmonary edema (fluid in the lungs) or rales. Common, less serious symptoms include the following: chest pain skin or tissue damage if the drug leaks out of the venous catheter into the surrounding tissue headache, nervousness, tremor, numbness/tingling (paresthesias) in hands or feet nausea, vomiting excitability, dizziness, sweating, flushing Manufactured by: Emcure Pharmaceuticals Ltd., Plot No. SM-14, 15 & 16/1, GIDC, Sanand - II, Charal, Tal - Sanand, Ahmedabad, Gujarat 382110, India. Manufactured for: Avet Pharmaceuticals Inc. East Brunswick, NJ 08816 1.866.901.DRUG (3784) Revised. 04/2022 logo

14 CLINICAL STUDIES Increases in systolic and mean blood pressure following administration of phenylephrine were observed in 42 literature-based studies in the perioperative setting, including 26 studies where phenylephrine was used in low- risk (ASA 1 and 2) pregnant women undergoing neuraxial anesthesia during cesarean delivery, 3 studies in non-obstetric surgery under neuraxial anesthesia, and 13 studies in patients undergoing surgery under general anesthesia. Mean arterial blood pressure increases were also observed in two double-blind, active-controlled studies in patients with septic shock.

8 USE IN SPECIFIC POPULATIONS 8.1 Pregnancy Pregnancy Category C Animal reproduction studies have not been conducted with intravenous phenylephrine. It is also not known whether phenylephrine can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. Phenylephrine hydrochloride should be given to a pregnant woman only if clearly needed. 8.2 Labor and Delivery The most common maternal adverse reactions reported in studies of phenylephrine use during neuraxial anesthesia during cesarean delivery include nausea and vomiting, which are commonly associated with hypotension, bradycardia, reactive hypertension, and transient arrhythmias. Phenylephrine does not appear to cause a decrease in placental perfusion sufficient to alter either the neonate Apgar scores or blood-gas status. 8.3 Nursing Mothers It is not known whether this drug is excreted in human milk. 8.4 Pediatric Use Safety and effectiveness in pediatric patients have not been established. 8.5 Geriatric Use Clinical studies of phenylephrine 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. 8.6 Hepatic Impairment In patients with liver cirrhosis [Child Pugh Class A (n=3), Class B (n=5) and Class C (n=1)], dose-response data indicate decreased responsiveness to phenylephrine. Consider using larger doses than usual in hepatic impaired subjects. 8.7 Renal Impairment In patients with end stage renal disease (ESRD) undergoing hemodialysis, dose-response data indicates increased responsiveness to phenylephrine. Consider using lower doses of phenylephrine hydrochloride in ESRD patients.

16 HOW SUPPLIED/STORAGE AND HANDLING Phenylephrine Hydrochloride Injection, USP, is supplied as follows: NDC 23155-620-41: 1 mL single dose vials packaged in cartons containing 25 vials per carton. Store at 20° to 25°C (68° to 77°F); excursions permitted 15° to 30° C (59° to 86° F) [See USP Controlled Room Temperature]. Protect from light. Keep covered in carton until time of use. The 1 mL vials are for single use only; The diluted solution should not be held for more than 4 hours at room temperature or for more than 24 hours under refrigerated conditions. Discard any unused portion.