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You are here: Home » eGM Resources » Health Information & Resources Portal|Home » RX Drug List (listed alphabetically) » Drug Reference (R's) » Risperidone


Risperidone is an antipsychotic agent belonging to a new chemical class, the benzisoxazole derivatives. The chemical designation is 3-[2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1 -piperidinyl]ethyl]-6,7,8,9-tetrahydro-2-methyl-4H-pyrido[1 ,2-a]pyrimidin-4-one. Its molecular formula is C23H27FN4O2 and its molecular weight is 410.49.

Risperidone is a white to slightly beige powder. It is practically insoluble in water, freely soluble in methylene chloride, and soluble in methanol and 0.1 N HCl.

Risperdal tablets are available in 0.25 mg (dark yellow), 0.5 mg (red-brown), 1 mg (white), 2 mg (orange), 3 mg (yellow), and 4 mg (green) strengths. Inactive ingredients are colloidal silicon dioxide, hydroxypropyl methylcellulose, lactose, magnesium stearate, microcrystalline cellulose, propylene glycol, sodium lauryl sulfate, and starch (corn). Tablets of 0.25, 0.5, 2, 3, and 4 mg also contain talc and titanium dioxide. The 0.25 mg tablets contain yellow iron oxide, the 0.5 mg tablets contain red iron oxide; the 2 mg tablets contain FD&C yellow no. 6 aluminum lake; the 3 mg and 4 mg tablets contain D&C yellow no. 10; the 4 mg tablets contain FD&C blue no. 2 aluminum lake.

Risperidone is also available as a 1 mg/ml oral solution.
The Inactive Ingredients for This Solution Are: Tartaric acid, benzoic acid, sodium hydroxide and purified water.


CATEGORIES: Psychosis; Schizophrenia; FDA Class 1P ("Priority Review"); FDA Approved 1993 Dec; Pregnancy Category C; Top 200 Drugs

FDA Drug Classes: Antipsychotics/Antimanics


BRAND NAMES: Risperdal; Rispid

Rispid (India)

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