| Noun | 1. | clozapine - an antipsychotic drug (trade name Clozaril) used as a sedative and for treatment-resistant schizophrenia; know to have few side effects antipsychotic, antipsychotic agent, antipsychotic drug, major tranquilizer, major tranquilliser, major tranquillizer, neuroleptic, neuroleptic agent, neuroleptic drug - tranquilizer used to treat psychotic conditions when a calming effect is desired |