SPL Set ID: d62b2c5a-1693-4e67-96d5-197e1fdc8694

The active ingredient in alosetron tablets, USP is alosetron hydrochloride (HCl), USP a potent and selective antagonist of the serotonin 5-HT3 receptor type. Chemically, alosetron is designated as 2,3,4,5-tetrahydro-5-methyl-2-[(5-methyl-1H-imidazol-4­ yl)methyl]-1H-pyrido[4,3-b]indol-1-one, monohydrochloride. Alosetron is achiral and has the empirical formula C 17 H 18 N 4 O•HCl, representing a molecular weight of 330.8. Alosetron is a white to pale brown colored powder that has a solubility of 66.82 mg/mL in water, 83.34 mg/mL in 0.1N hydrochloric acid, 74.65 mg/mL in pH 6.8 phosphate buffer, and 60.79 mg/mL in pH 8.0 phosphate buffer. The chemical structure of alosetron is: Alosetron Tablets USP are supplied for oral administration as 0.5 mg (white) and 1 mg (white) tablets. The 0.5 mg tablet contains 0.562 mg alosetron hydrochloride, USP equivalent to 0.5 mg alosetron, and the 1 mg tablet contains 1.124 mg alosetron hydrochloride, USP equivalent to 1 mg of alosetron. Each tablet also contains the inactive ingredients lactose (anhydrous), magnesium stearate, microcrystalline cellulose, and pregelatinized starch. The white film coat for the 0.5 mg tablet contains hypromellose, titanium dioxide, macrogol and triacetin. The white film coat for the 1 mg tablet contains hypromellose, titanium dioxide, macrogol and triacetin. alo-str.jpg