A pharmacokinetic model, with Michaelis-Menten elimination, has been developed for drugs and propranolol in particular. The theory is given and the relationship between the area under the theoretical plasma level curve and the absorption rate constant is discussed. This approach allows for an explanation of many of the observed pharmacokinetics of 'Inderal' and particularly 'Inderal' LA; a sustained release preparation of propranolol. In particular, the bioavailability, as measured by area under the curve, is found to be strongly dependent on the absorption half-life in agreement with experimentally observed data.
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