SPL Set ID: ac9aa10d-cd52-4ac9-a01d-e3cbf14d4913

Diltiazem hydrochloride, USP is a calcium ion cellular influx inhibitor (slow channel blocker or calcium antagonist). Chemically, diltiazem hydrochloride is 1,5-Benzothiazepin-4(5H)-one, 3-(acetyloxy)-5-[2-(dimethylamino) ethyl]-2, 3-dihydro-2-(4-methoxyphenyl)-, monohydrochloride, (+)-cis-. The chemical structure is: Diltiazem hydrochloride, USP is a white to off-white crystalline powder with a bitter taste. It is freely soluble in chloroform, in formic acid, in methanol and in water, sparingly soluble in dehydrated ethanol, insoluble in ether. It has a molecular weight of 450.98. Diltiazem hydrochloride extended-release capsules, USP are formulated as a once-a-day extended-release capsule containing 120 mg diltiazem hydrochloride, USP (equivalent to 110.3 mg diltiazem), 180 mg diltiazem hydrochloride, USP (equivalent to 165.45 mg diltiazem), 240 mg diltiazem hydrochloride, USP (equivalent to 220.6 mg diltiazem), 300 mg diltiazem hydrochloride, USP (equivalent to 275.75 mg diltiazem), or 360 mg diltiazem hydrochloride, USP (equivalent to 330.9 mg diltiazem). The 120 mg, 180 mg, 240 mg, 300 mg and 360 mg capsules contain acetyl tributyl citrate, ethylcellulose, hypromellose, microcrystalline cellulose, povidone K-30, sucrose stearate, talc. The 120 mg, 180 mg, 240 mg, 300 mg and 360 mg capsule shells contain FD&C Blue 1, gelatin and titanium dioxide. The 300 mg capsule shell also contain iron oxide black. The 120 mg capsule shells are imprinted with edible blue ink containing FD&C Blue # 2 Aluminum Lake and shellac. The 180 mg, 240 mg, 300 mg and 360 mg capsule shells are imprinted with edible white ink containing potassium hydroxide, shellac and titanium dioxide. For oral administration. FDA approved dissolution test specifications differ from USP. diltiazem-str.jpg