Temazepam DESCRIPTION NewsLinks Temazepam is a benzodiazepine hypnotic agent. The chemical name is 7-chloro-1, 3-dihydro-3-hydroxy-1-methyl-5-phenyl-2H-1, 4-benzodiaz epin-2-one. Temazepam is a white, crystalline substance, very slightly soluble in water and sparingly soluble in alcohol. Temazepam capsules, 7.5 mg, 15 mg and 30 mg, are for oral administration. Restoril 7.5 mg, 15 mg and 30 mg ...