Effect of phenobarbital on the disposition of intravenous theophylline

Abstract
The disposition of intravenous doses of theophylline was determined in normal male subjects before and after treatment with phenobarbital for 2 wk. Although there was some variation in disposition of the 2 drugs, there were no significant effects of phenobarbital on theophylline kinetics. We conclude that theophylline dosage need not be altered during concomitant administration of phenobarbital.

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