Which pharmacokinetic parameter is affected most by decreased intestinal motility related to the aging process? a. excretion b. distribution c. absorption d. metabolism?

I believe the answer is c. absorption

The phase of pharmacokinetic that happens in the intestine is when the drug absorbed. A person with old age will have lower intestine motility. This will increase the transit time which will increase the amount of drug absorbed.

Age could also influence others pharmacokinetic parameter(excretion, distribution, metabolism) but it is related with another organ, not intestine.

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