Cogentin pharmacokinetics: which drug has bioavailability 95%?

Cogentin pharmacokinetics: which drug has bioavailability 95%?

• A. Benadryl
• B. Valbenazine
• C. Cogentin
• D. Haloperidol

Answer: (C)

Bioavailability is the fraction of an oral dose that reaches the bloodstream. Cogentin (benztropine) has an oral bioavailability of about 95%, so nearly the entire dose you take orally becomes available to exert its effects. This high value reflects efficient absorption from the GI tract and minimal loss to first-pass metabolism, making the drug’s systemic and CNS effects more predictable after oral dosing. Other drugs on the list don’t reach that level of reliability in absorption due to differences in how they’re absorbed and metabolized, so benztropine’s nearly complete oral availability stands out.

Bioavailability is the fraction of an oral dose that reaches the bloodstream. Cogentin (benztropine) has an oral bioavailability of about 95%, so nearly the entire dose you take orally becomes available to exert its effects. This high value reflects efficient absorption from the GI tract and minimal loss to first-pass metabolism, making the drug’s systemic and CNS effects more predictable after oral dosing. Other drugs on the list don’t reach that level of reliability in absorption due to differences in how they’re absorbed and metabolized, so benztropine’s nearly complete oral availability stands out.