Risperdal (risperidone) is an antipsychotic medicine that works by changing the effects of chemicals in the brain.
Risperdal is used to treat schizophrenia in adults and children who are at least 13 years old.
Risperdal is also used to treat symptoms of bipolar disorder (manic depression) in adults and children who are at least 10 years old.
Risperdal is also used to treat symptoms of irritability in autistic children who are 5 to 16 years old.
Severe Renal and Hepatic Impairment in Adults: use a lower starting dose of 0.5 mg twice daily. May increase to dosages above 1.5 mg twice daily at intervals of one week or longer.
Risperidone may increase the risk of death in older adults with dementia-related psychosis and is not approved for this use.
Although the causes of death were varied, most of the deaths appeared to be either cardiovascular (e.g., heart failure, sudden death) or infectious (e.g., pneumonia) in nature
Risperidone may impair your thinking or reactions.
Mechanism of action
The elimination half-life of risperidone is 3 hours (20 hours for poor metabolizers), and is 21 hours of hydroxyrisperidone (30 hours for poor metabolizers).