Tiapride: Effects on Tardive Dyskinesia and on Prolactin Plasma Concentrations

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Abstract
In a placebo-controlled double-blind crossover study of 21 patients chronically treated with neuroleptics and suffering from tardive dyskinesia, tiapride (600 mg/day, mean plasma level: 682 ng/ml) exhibited a transient efficacy during 12 weeks of treatment, most distinct in the 6th week (p < 0.01). Tiapride induced an increase of prolactin plasma levels, on the average, from 1,195 to 2,179 µlU/ml (p < 0.01). Tiapride was well tolerated. Increase of parkinsonism was only mild and not significant. The results underline the difficulty in treating tardive dyskinesia and, thus, confirm the importance of prevention.

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