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Progabide, a gamma-aminobutyric acid agonist, was given to ten patients with essential tremor in a double-blind, placebo-controlled crossover study. The effect of progabide did not differ from that of placebo. Alterations in gamma-aminobutyric acid neurotransmission do not appear to be involved in the pathogenesis of essential tremor.
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Koller et al. (1987) studied this question.
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