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Diltiazem hydrochloride is a white to off-white crystalline powder with a bitter taste.
It is soluble in water, methanol, and chloroform.
It has a molecular weight of 450.99. Cardizem LA (diltiazem) Tablets, for oral administration are formulated as a once-a-day extended-release tablet containing 120 mg, 180 mg, 240 mg, 300 mg, or 360 mg diltiazem hydrochloride.