What the FDA labels say about taking them together
Etonogestrel and felbamate
Etonogestrel's FDA label of May 28, 2026 names felbamate in its drug interactions section; the felbamate label PlainMeds reads does not name etonogestrel. The etonogestrel label: “Some drugs or herbal products that may decrease the effectiveness of HCs include efavirenz, phenytoin, barbiturates, carbamazepine, bosentan, felbamate, griseofulvin, oxcarbazepine, rifampicin, topiramate, rifabutin …”
Check it at the source: the etonogestrel FDA label on DailyMed (effective May 28, 2026, Organon LLC); the felbamate FDA label on DailyMed (effective August 15, 2025, Viatris Specialty LLC).
What does the etonogestrel label say about felbamate?
Etonogestrel label, drug interactionsSome drugs or herbal products that may decrease the effectiveness of HCs include efavirenz, phenytoin, barbiturates, carbamazepine, bosentan, felbamate, griseofulvin, oxcarbazepine, rifampicin, topiramate, rifabutin, rufinamide, aprepitant, and products containing St. John's wort.
Source: FDA drug label (Nexplanon), Organon LLC, effective May 28, 2026 (SPL set 487f8a62-e142-457c-97cc-2e398fde7594), via openFDA; the full label on DailyMed
What does the felbamate label say about etonogestrel?
Felbamate's label (effective August 15, 2025) does not name etonogestrel in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Felbatol), NDA020189 (Mylan Speciality Lp), as published by Viatris Specialty LLC, effective August 15, 2025 (SPL set 2f522701-397a-11de-8a39-0800200c9a66), via openFDA; the full label on DailyMed
These are the labels' own sentences. PlainMeds does not grade interactions; a pharmacist or prescriber can say what they mean for one person's medicines.
Both medicines on the record
| Etonogestrel | Felbamate | |
|---|---|---|
| Labeled for | Birth control | Seizures and epilepsy |
| Boxed warning | Yes | Yes |
| Pharmacy cost (NADAC) | n/a | $1.00 per tablet 600 mg tablet |
| Shortage now | No current entry | No current entry |
Source: FDA NDC Directory, CMS NADAC of October 7, 2026 and the FDA Drug Shortage Database (FDA files October 8, 2026)
What next?
- Check more medicines together
- up to five at once