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Epinephrine Injection, USP, is a sterile, nonpyrogenic solution intended for subcutaneous or intramuscular injection. When diluted, it may also be administered intracardially or intravenously. Each mL contains: 1 mg Epinephrine as the hydrochloride, in Water for Injection, USP, q.s. Sodium Chloride added for isotonicity, 0.5% Chlorobutanol (chloroform derivative) as a preservative and not more than 0.15% Sodium Metabisulfite as an antioxidant. The pH may be adjusted with Sodium Hydroxide and/ or Hydrochloric Acid. Epinephrine is the active principle of the adrenal medulla, chemically described as (-)-3,4-Dihydroxy-α-[(methylamino)methyl]benzyl alcohol.