Does Felbamate Interact with Etonogestrel And Ethinyl Estradiol?
Felbamate and Etonogestrel And Ethinyl Estradiol have a moderate drug interaction according to U.S. FDA drug labeling data. CYP3A4 enzyme inducer that may decrease plasma concentrations of etonogestrel and ethinyl estradiol, potentially diminishing contraceptive effectiveness or increasing breakthrough bleeding. The mechanism involves cyp3a4 enzyme induction. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Moderate
- Felbamate Class
- Anti-epileptic Agent
- Etonogestrel And Ethinyl Estradiol Class
- Estrogen
- Management
- Monitor for effects
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Felbamate and Etonogestrel And Ethinyl Estradiol occurs because cyp3a4 enzyme induction. Clinically, this means cyp3a4 enzyme inducer that may decrease plasma concentrations of etonogestrel and ethinyl estradiol, potentially diminishing contraceptive effectiveness or increasing breakthrough bleeding. This is classified as a moderate interaction. While it may not require stopping either medication, your healthcare provider should be aware you are taking both so they can monitor for potential effects and adjust treatment if necessary.
What To Tell Your Doctor or Pharmacist
If you are taking Felbamate and your doctor is considering prescribing Etonogestrel And Ethinyl Estradiol (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