Abstract
Prochlorperazine, 1-[3-(3-chloro-10-phenothiazinyl)propyl]-4-methyl-piperazine dimaleate, a phenothiazine derivative related to chlorpromazine, was discovered in the Rhône Poulenc laboratories, and studied pharmacologically in 1956, by Ducrot and Koetschet, for its anti-emetic properties. Clinical trials, following this experimental evidence, suggested that, as well as possessing powerful anti-emetic properties, the drug was of considerable therapeutic value in migraine, Ménière's syndrome, and vertigo of other origins.

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