SPL Set ID: a4f917f4-2aa2-c3ed-071e-232fa0f125e8

Chemical name: 5-ethyldihydro- 5-phenyl-4,6 (1H, 5H) pyrimidinedione. Structural formula: C 12 H 14 N 2 O 2 M.W. 218.25 Primidone is a white crystalline powder, M.P. 279-284°C. It is very slightly soluble in methanol and methylene dichloride, slightly soluble in alcohol and insoluble in water. It possesses no acidic properties, in contrast to its barbiturate analog. Primidone tablets 50 mg and 250 mg contain the following inactive ingredients: lactose monohydrate, magnesium stearate, methyl cellulose, purified water, sodium lauryl sulphate, sodium starch glycolate and talc. Primidone tablets 250 mg also contain yellow iron oxide.