alexa Pharmacokinetics of Decongestants

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Pharmacokinetics of Decongestants

Only three drugs are commonly used as oral decongestants—phenylpropanolamine (PPA), pseudoephedrine (PDE), and phenylephrine (PE). They are all chiral drugs that exist as stereoisomers. It  is possible that each enantiomer can reflect significant enantioselective differences with regard to both pharmacokinetic and pharmacodynamic effects. Both PPA and PDE are readily and completely absorbed, whereas PE, with a bioavailability of only approximately 38%, is subject to gut wall metabolism and undergoes erratic absorption. Peak concentrations are reached between 0.5 and 2 hours after administration. All three drugs are extensively distributed into extravascular sites (apparent volume of distribution between 2.6 and 5.0 L/kg).

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