A procedure for determining carbamazepine in biological specimens both from animals and humans is described. Carbamazepine was found to enter the brain relatively rapidly and its distribution is uniform through the body. In animals absorption and tissue distribution was found to be influenced to a certain extent by the vehicle employed. A clear correlation between the brain levels and the protection towards maximal electroshock was observed. Preliminary data on humans suggest a relatively slow absorption. An oral dose of 6 mg/kg gives plasma levels comparable to the ones obtained after an administration of 400 mg/kg in rats.
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