Our results showed that nimodipine at a dose of 5 mg/kg showed antipsychotic effects comparable with the standard drug haloperidol. More importantly, nimodipine at this dose of 5 mg/kg used in combination with half of the therapeutic dose of haloperidol (0.1 mg/kg), showed effects significantly better than those of full therapeutic dose of haloperidol (0.2 mg/kg). Nimodipine, due its lipid solubility (CNS entry) and relative lack of significant adverse effects has a strong potential to be used as an antipsychotic, especially as an adjunct to the typical antipsychotics. The unfavorable pharmacokinetics of nimodipine; short half-life of and short duration of action, probably limits its potential to being an adjunctive drug to conventional (typical) antipsychotics whereby it can possibly reduce the dose requirements and the numerous troublesome adverse effects.