Morphine Sulfate Injection, USP is an opioid agonist, available as 2 mg/mL, 4 mg/mL, 8 mg/mL, and 10 mg/mL (1 mL fill in 1.5 mL NexJect™ Single-dose Prefilled Syringe with Luer Lock). When exposed to air it gradually loses water of hydration, and darkens on prolonged exposure to light. The chemical name is 7,8-Didehydro-4,5-epoxy-17-methyl-(5α,6α)-morphinan-3,6-diol sulfate (2: 1) (salt), pentahydrate, with the following chemical structure:
(C17H19NO3)2 ∙ H2SO4 ∙ 5H2O Molecular Weight is 758.83
Morphine sulfate USP is an odorless, white crystalline powder with a bitter taste. It has a solubility of 1 in 21 parts of water and 1 in 1000 parts of alcohol, but is practically insoluble in chloroform or ether. The octanol:water partition coefficient of morphine is 1.42 at physiologic pH and the pKa is 7.9 for the tertiary nitrogen (the majority is ionized at pH 7.4).
Morphine Sulfate Injection, USP is a sterile, nonpyrogenic solution of morphine sulfate, free of antioxidants and preservatives to be administered by the intravenous route.
Each milliliter of sterile solution contains 2 mg, 4 mg, 8 mg, or 10 mg Morphine Sulfate Injection, USP and the following inactive ingredients: 0.2 mg edetate disodium, 0.4 mg citric acid for the 2 mg, 4 mg, 8 mg, and 10 mg Morphine Sulfate Injection, USP, sodium chloride to adjust isotonicity and water for injection. Hydrochloric acid and/or sodium hydroxide may be added to adjust pH. The pH range is 2.5 to 4.0.