Meperidine elimination half-life is approximately

Meperidine elimination half-life is approximately

• A. 1-2 hours
• B. 2.5-4 hours
• C. 6-8 hours
• D. 12-24 hours

Answer: (B)

Meperidine is cleared from the body relatively quickly as the parent drug, with an elimination half-life of about 2.5 to 4 hours in healthy adults. This means the plasma concentration drops by half in roughly that time after a dose. A important nuance is that it’s metabolized to normeperidine, which has a much longer half-life and can accumulate, especially if renal function is impaired, potentially causing neurotoxic effects like seizures. So while the parent drug’s half-life is in the 2.5–4 hour range, the metabolite can linger longer and is the reason meperidine is used cautiously.

Meperidine is cleared from the body relatively quickly as the parent drug, with an elimination half-life of about 2.5 to 4 hours in healthy adults. This means the plasma concentration drops by half in roughly that time after a dose. A important nuance is that it’s metabolized to normeperidine, which has a much longer half-life and can accumulate, especially if renal function is impaired, potentially causing neurotoxic effects like seizures. So while the parent drug’s half-life is in the 2.5–4 hour range, the metabolite can linger longer and is the reason meperidine is used cautiously.