Quinidine is an antimalarial schizonticide and an antiarrhythmic agent with class 1a activity; it is the d-isomer of quinine and its molecular weight is 324.43. Quinidine gluconate is the gluconate salt of quinidine; its chemical name is cinchonan-9-ol, 6'-methoxy-, (9 S )-, mono-D-gluconate.

Its empirical formula is C₂₀H₂₄N₂O₂·C₆H₁₂O₇, and its molecular weight is 520.58, of which 62.3% is quinidine base.

Each vial of Quinidine Gluconate Injection contains 800 mg (1.5 mmol) of quinidine gluconate (500 mg of quinidine) in 10 mL of Sterile Water for Injection, 0.005% of edetate disodium, 0.25% phenol, and (as needed) D-gluconic acid [dgr ]-lactone to adjust the pH.

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