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Related Experiment Videos

Interactions and non-interactions with ranitidine.

W Kirch, H Hoensch, H D Janisch

    Clinical Pharmacokinetics
    |November 1, 1984
    PubMed
    Summary

    Ranitidine, an H2-receptor antagonist, interacts with drugs by affecting liver metabolism and absorption, unlike cimetidine. While some drug interactions are less significant than with cimetidine, others like with midazolam and cobalamin require attention.

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    Area of Science:

    • Pharmacology
    • Gastroenterology

    Background:

    • Two H2-receptor antagonists, cimetidine and ranitidine, treat peptic ulcer disease.
    • Cimetidine is known for significant drug interactions.
    • Ranitidine also interacts with drugs, but often to a lesser extent than cimetidine.

    Purpose of the Study:

    • To compare the drug interaction profiles of ranitidine and cimetidine.
    • To elucidate the mechanisms of ranitidine's pharmacokinetic interactions.
    • To assess the clinical significance of these interactions.

    Main Methods:

    • Review of existing literature on drug interactions with ranitidine and cimetidine.
    • Analysis of pharmacokinetic studies investigating ranitidine's effects on drug metabolism, absorption, and excretion.
    • Comparison of interaction mechanisms, including cytochrome P-450 inhibition and effects on gastric pH and renal secretion.

    Main Results:

    • Ranitidine inhibits cytochrome P-450 to a lesser extent than cimetidine, leading to fewer significant interactions with drugs like propranolol and phenytoin.
    • Ranitidine can increase midazolam bioavailability by altering gastric pH and affecting liver metabolism.
    • Ranitidine significantly reduces cobalamin absorption and competes with procainamide for renal secretion.
    • Interactions with warfarin, metoprolol, and nifedipine are likely due to P-450 inhibition but may not be clinically significant.

    Conclusions:

    • Ranitidine exhibits a distinct drug interaction profile compared to cimetidine.
    • While generally less interactive, ranitidine can cause significant pharmacokinetic changes, particularly affecting drug absorption and renal excretion.
    • The clinical relevance of ranitidine's drug interactions varies, with some interactions being more pronounced than others.

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