Does Oral Contraceptives Interact with Amoxicillin?
Moderate interaction. Amoxicillin may reduce efficacy of combined oral estrogen/progesterone contraceptives by affecting intestinal flora and lowering estrogen reabsorption.
Source & how this summary was prepared
This interaction summary was extracted from FDA drug labeling through openFDA, using automated processing and AI assistance. NIH/NLM RxNorm helps organize drug names.
Read the saved source label on DailyMed →
A separate current-label comparison has not been recorded for this page. Read about our extraction process.
- Interaction classification
- Moderate
- Management
- Confirm exact products with your pharmacist
- Data Source
- U.S. FDA via OpenFDA
How this interaction works
Altered intestinal flora leading to lower estrogen reabsorption
What To Tell Your Doctor or Pharmacist
If you are taking Oral Contraceptives and your doctor is considering prescribing Amoxicillin (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider