DRUG DESCRIPTION. Restoril™ (temazepam) is a benzodiazepine hypnotic agent. The chemical name is 7-chloro1,3-dihydro-3-hydroxy-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-one, and the structural formula is: C16H13ClN2O2 MW = 300.74.Temazepam is a white, crystalline substance, very slightly soluble in water and sparingly soluble in alcohol USP. Restoril™ (temazepam) capsules USP, 7.5 mg, 15 mg, 22.5 mg, and 30 mg, are for oral administration.Active Ingredient: temazepam USP. Inactive Ingredients: FD&C Blue #1, FD&C Red #3, gelatin, lactose, magnesium stearate, red iron oxide, titanium dioxide.RUG DESCRIPTION. Restoril™ (temazepam) is a benzodiazepine hypnotic agent. The chemical name is 7-chloro1,3-dihydro-3-hydroxy-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-one, and the structural formula is: C16H13ClN2O2 MW = 300.74.