SPL Set ID: 3dd09a0d-a782-1d6d-a552-b71e5bcbf2fe

Tizanidine capsules contains tizanidine hydrochloride as the active ingredient, which is a centrally acting α 2 -adrenergic agonist. Its chemical name is 5-chloro-4-(2-imidazolin-2-yl-amino)-2,1,3-benzothiodiazole monohydrochloride. Its molecular formula is C 9 H 8 CIN 5 SꞏHCl and a molecular weight of 290.17. Its structural formula is: Tizanidine hydrochloride is almost white to slightly yellow, crystalline powder, which is odorless or with a faint characteristic odor. Tizanidine hydrochloride is slightly soluble in water and methanol; solubility in water decreases as the pH increases. Tizanidine capsules 2 mg, 4 mg and 6 mg, supplied for oral administration, are composed of the active ingredient, tizanidine hydrochloride (2.288 mg equivalent to 2 mg tizanidine base, 4.576 mg equivalent to 4 mg tizanidine base, and 6.864 mg equivalent to 6 mg tizanidine base). Each capsule contains the following inactive ingredients: anhydrous lactose, polyvinyl acetate phthalate, stearic acid, and talc. Each capsule shell contains FD&C blue #2, gelatin and titanium dioxide. In addition, the 4 mg capsules shell contains FDA/E172 yellow iron oxide. The capsule printing ink contains black iron oxide, FD&C blue #1, FD&C blue #2, FD&C red #40, and FD&C yellow #10, propylene glycol, and shellac.