Risperidone (Risperdal) is an antipsychotic medication safe for use in adults and has the imprints R11 and M.
Risperidone belongs to a class of medications called atypical antipsychotics and works by changing the activity of certain natural substances in the brain. It is used to treat mental illnesses including bipolar disorder, schizophrenia, and irritability that stems from autistic disorder. It comes in liquid, tablet, or fast dissolving tablet form and is usually taken once or twice a day with or without food.
Johnson & Johnson's Janssen Pharmacueticals, makers of Risperdal, recently agreed to pay $181 million to 36 states to resolve allegations of inappropriate marketing of the drug. A separate Federal investigation related to Risperdal could also lead to criminal charges against the company.