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Related Experiment Videos

Cimetidine--acetaminophen interaction in humans.

M M Chen, C S Lee

    Journal of Clinical Pharmacology
    |April 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Cimetidine does not significantly alter acetaminophen pharmacokinetics, even with multiple doses. This suggests that combining these medications at therapeutic levels is unlikely to cause adverse drug interactions.

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    Area of Science:

    • Pharmacology
    • Drug Interactions
    • Clinical Pharmacokinetics

    Background:

    • Acetaminophen is a widely used analgesic.
    • Cimetidine is a common medication that can affect drug metabolism.
    • Understanding potential interactions is crucial for patient safety.

    Purpose of the Study:

    • To investigate the pharmacokinetic effects of single and multiple doses of cimetidine on acetaminophen.
    • To determine if cimetidine alters acetaminophen's absorption, distribution, metabolism, or excretion.

    Main Methods:

    • A three-phase, randomized, crossover study involving four healthy subjects.
    • Subjects received acetaminophen alone, with a single dose of cimetidine, or after a week of cimetidine pretreatment.
    • Pharmacokinetic parameters including peak concentration, peak time, half-life, clearance, and AUC were analyzed.

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    Main Results:

    • No significant differences were observed in acetaminophen peak concentration or peak time between treatment groups.
    • Cimetidine did not significantly impact acetaminophen's half-life or clearance.
    • The area under the acetaminophen plasma concentration-time curve (AUC) showed a slight, non-significant increase with cimetidine co-administration.

    Conclusions:

    • Cimetidine administration, both single and multiple doses, does not significantly alter acetaminophen pharmacokinetics.
    • The combination of therapeutic doses of acetaminophen and cimetidine is presumed to be safe with no significant adverse interactions.