What the FDA labels say about taking them together
Ethinyl estradiol/levonorgestrel and griseofulvin
Ethinyl estradiol/levonorgestrel's FDA label of August 27, 2026 names griseofulvin in its drug interactions section; the griseofulvin label PlainMeds reads does not name ethinyl estradiol/levonorgestrel. The ethinyl estradiol/levonorgestrel label: “Some drugs or herbal products that may decrease the effectiveness of hormonal contraceptives include phenytoin, barbiturates, carbamazepine, bosentan, felbamate, griseofulvin, oxcarbazepine, rifampicin, topiramate …”
Check it at the source: the ethinyl estradiol/levonorgestrel FDA label on DailyMed (effective August 27, 2026, Exeltis USA, Inc.); the griseofulvin FDA label on DailyMed (effective December 10, 2025).
What does the ethinyl estradiol/levonorgestrel label say about griseofulvin?
Ethinyl estradiol/levonorgestrel label, drug interactionsContinue backup contraception for 28 days after discontinuing the enzyme inducer to maintain contraceptive reliability. Examples Aprepitant, barbiturates, bosentan, carbamazepine, efavirenz, felbamate, griseofulvin, oxcarbazepine, phenytoin, rifampin, primidone, phenylbutazone, rifabutin, rufinamide, topiramate, products containing St. John's wort, and certain protease inhibitors (see separate section on protease inhibitors below).
Balcoltra label (Avion Pharmaceuticals, December 5, 2025), drug interactionsSome drugs or herbal products that may decrease the effectiveness of hormonal contraceptives include phenytoin, barbiturates, carbamazepine, bosentan, felbamate, griseofulvin, oxcarbazepine, rifampicin, topiramate, rifabutin, rufinamide, aprepitant, and products containing St. John’s wort.
Source: FDA drug label (Balcoltra, NDA208612), Avion Pharmaceuticals, effective December 5, 2025 (SPL set 752ab698-4b48-4614-8016-d1d33ee7c007), via openFDA
Source: FDA drug label (Twirla, NDA204017), Agile Therapeutics, Inc., effective June 30, 2026 (SPL set bcaf8db0-1750-425d-b008-255b5e7a9cc6), via openFDA
Source: FDA drug label (Tyblume), Exeltis USA, Inc., effective August 27, 2026 (SPL set b2482d51-d606-4aaa-8af4-19e4fe2f8872), via openFDA; the full label on DailyMed
What does the griseofulvin label say about ethinyl estradiol/levonorgestrel?
Griseofulvin's label (effective December 10, 2025) does not name ethinyl estradiol/levonorgestrel in these sections. A label lists what its studies and reports found; it is not a complete list.
Source: FDA drug label (Ultramicrosize Griseofulvin), Chartwell RX, LLC., effective December 10, 2025 (SPL set efb8a660-802c-4ca6-bbff-ad7b48b91aef), 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
| Ethinyl estradiol/levonorgestrel | Griseofulvin | |
|---|---|---|
| Labeled for | Birth control | Fungal infections |
| Boxed warning | Yes | No |
| Pharmacy cost (NADAC) | $0.154 per tablet 28 tablet | $3.74 per tablet 250 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