Isoniazid (isonicotinic acid hydrazide [INH]) has been used for treatment of tuberculosis since 1952. Pyridoxal-5-phosphate and consequently GABA synthesis are decreased by INH, which increases cerebral excitability, and thus seizures might occure this way. In some rare cases, INH may induce mania, depression, obsessive-compulsive disorder, and psychosis via acting as a monoamine oxidase (MAO) inhibitor or by decreasing pyridoxine. In this report, a 28-year-old man with acute psychotic attack under prophylactic INH treatment before infliximab treatment, was presented.
Key words: Isoniazid, psychotic disorders
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