Risperdal may interact with other medicines that make you sleepy such as cold or allergy medicine, narcotic pain medicine, sleeping pills, muscle relaxers, and medicine for seizures, depression, or anxiety , carbamazepine, cimetidine, ranitidine, clozapine, fluoxetine, paroxetine, phenytoin, valproic acid, phenobarbital, rifampin, or medicines used to treat parkinson s disease.
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