Objective: To report a case of psychosis induced by therapeutic doses of baclofen.
Case Summary: A 32-year-old Hindu man was prescribed oral baclofen 10 mg twice daily for relief of muscular spasms secondary to tetanus. After 4 weeks of baclofen use, he presented to the psychiatry emergency facility with a 4 day history of third-person auditory hallucinations and persecutory and referential delusions without underlying mood symptoms. These symptoms resolved within 1 week of discontinuing baclofen. Rechallenge with baclofen resulted in reemergence of psychotic symptoms, which disappeared after discontinuing baclofen.
Discussion: Reemergence of psychotic symptoms after rechallenge with baclofen suggests baclofen-induced psychosis. Use of the Naranjo probability scale indicates a probable association of baclofen with this patient's psychosis. The absence of underlying mood disorder makes this case different from previously reported ones.
Conclusions: Baclofen may be associated with the occurrence of psychosis. Clinicians should consider baclofen-induced psychosis as a differential diagnosis in patients presenting with psychosis during treatment with this drug.
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