Risperidone

Appearance：Almost white or almost white powder.

Solubility：Practically insoluble in water, freely soluble in methylene chloride, sparingly soluble in ethanol (96 per cent). It dissolves in dilute acid solutions.

Appearance of solution：The solution is clear and colourless.

Related substances：

Impurity A ,B,C,D,E ≤ 0.2 % ;Impurity K ≤ 0.15 % ;unspecified impurities≤ 0.10 % ;total≤ 0.3%;

Loss on drying：Maximum 0.5 percent

Sulfated ash：Maximum 0.1 percent

Assay：99.0 per cent to 101.0% per cent（dried substance).

Used for treating acute and chronic schizophrenia. Especially for positive and negative symptoms and their accompanying emotional symptoms (such as anxiety, depression, etc.), it has good therapeutic effects. It can also alleviate emotional symptoms associated with schizophrenia. For patients who are effectively treated in the acute phase, this product can continue to exert its clinical efficacy during maintenance treatment.