Summary
To clarify whether primidone itself, and not only its metabolite phenobarbitone, suppresses essential tremor, the effect of a high single dose of primidone was tested. Of 11 patients, 8 showed a reduction of their tremor by 54%–69% for up to 28h. The serum concentration of primidone was as expected, whereas those of the metabolites phenyl-ethylmalonamide and phenobarbitone were very low. The tremor suppression can thus be considered to be an effect of primidone. Three of the 11 patients did not show a reduction of tremor.
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Seyfert, S., Honé, A. & Holl, G. Primidone and essential tremor. J Neurol 235, 168–170 (1988). https://doi.org/10.1007/BF00314310
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DOI: https://doi.org/10.1007/BF00314310