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Related Experiment Videos

Oral contraceptive drug interactions: important considerations.

A Fazio1

  • 1Northeast Louisiana University School of Pharmacy, Monroe 71209-0470.

Southern Medical Journal
|August 1, 1991
PubMed
Summary

Many common medications, including antibiotics and epilepsy drugs, can reduce oral contraceptive (OC) effectiveness. OCs can also increase levels of other drugs. A complete drug history is crucial for patients using OCs.

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Area of Science:

  • Pharmacology
  • Drug Interactions
  • Reproductive Health

Background:

  • Oral contraceptives (OCs) are widely used by women of reproductive age.
  • Interactions between OCs and other medications can significantly impact treatment efficacy and safety.
  • Commonly prescribed and over-the-counter drugs can affect OC pharmacokinetics and pharmacodynamics.

Purpose of the Study:

  • To review the mechanisms and clinical significance of drug interactions involving oral contraceptives.
  • To identify drug classes known to interact with OCs.
  • To emphasize the importance of comprehensive drug history in patients using OCs.

Main Methods:

  • Literature review of documented drug interactions with oral contraceptives.
  • Analysis of proposed mechanisms of interaction, including enzyme induction/inhibition and altered enterohepatic circulation.

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  • Identification of specific drugs and drug classes that affect OC efficacy or are affected by OCs.

    • Main Results:

    • Drugs used for epilepsy, tuberculosis, and depression are known to interact with OCs.
    • Antibiotics (e.g., rifampin, ampicillin, tetracycline), analgesics, and antihistamines can decrease OC efficacy.
    • OCs can increase plasma concentrations of theophylline, diazepam, and other benzodiazepines.

    Conclusions:

    • Drug interactions with OCs are common and involve various mechanisms.
    • A thorough drug history is essential for all patients taking OCs to prevent adverse events and ensure therapeutic success.
    • Healthcare providers must be aware of potential interactions to optimize patient care.