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Related Experiment Videos

Drug interactions with cimetidine

T L Schwinghammer

    American Journal of Hospital Pharmacy
    |December 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Cimetidine (an H2 blocker) can alter drug absorption by increasing stomach pH. However, its most significant drug interactions stem from reducing liver blood flow and inhibiting drug metabolism, impacting numerous medications.

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    Area of Science:

    • Pharmacology
    • Drug Metabolism
    • Gastroenterology

    Background:

    • Cimetidine is a widely used medication with known effects on gastric acid secretion.
    • Understanding its pharmacokinetic interactions is crucial for safe and effective prescribing.

    Purpose of the Study:

    • To discuss the drug-drug interactions associated with cimetidine.
    • To elucidate the underlying mechanisms of these interactions.

    Main Methods:

    • Review of existing literature on cimetidine's in vivo actions.
    • Analysis of pharmacokinetic and pharmacodynamic data related to cimetidine.
    • Identification of drugs affected by cimetidine's mechanisms.

    Main Results:

    • Cimetidine increases gastric pH, potentially altering drug absorption, though clinical significance is limited.

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  • Cimetidine significantly reduces hepatic blood flow and inhibits microsomal drug metabolism.
  • These effects impair the inactivation of numerous co-administered drugs, leading to clinically relevant interactions.

    • Conclusions:

    • Cimetidine's impact on gastric pH has minimal clinical relevance for drug interactions.
    • The inhibition of hepatic metabolism and reduction in hepatic blood flow are the primary drivers of clinically significant cimetidine-related drug-drug interactions.