FDA Draft Guidance on Risperdal Bioequivalence Studies

FDA has posted a draft guidance on Bioequivalence Recommendations for Risperidone that outlines recommended bioequivalence testing for ANDA sponsors seeking approval for a generic copy of Jannsen’s antipsychotic Risperdal. The document recommends an in vitro drug release study and an in vivo two-period, crossover steady-state study. The in vivo study calls for male and nonpregnant female patients with schizophrenia or bipolar I disorder who are already receiving a stable regimen of risperidone long-acting injection via the intramuscular route. “FDA recommends that studies not be conducted using healthy subjects or patients on a different antipsychotic treatment,” the guidance says.

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