Ethinyl Estradiol and Isotretinoin: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Ethinyl Estradiol
No brand names on recordIsotretinoin
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Here's the important thing to know: isotretinoin (Accutane and similar) can be very harmful to a pregnancy, so it is critical not to get pregnant while taking it. On top of that, there is a concern that isotretinoin may make hormonal birth control, like the pill with ethinyl estradiol, less reliable. Pregnancies have happened in women using just one method.
The good news is this is easy to manage. Your care team will have you use two forms of birth control at the same time during treatment. Please talk with your doctor or pharmacist before starting, and don't stop any medicine on your own.
Effect: potential reduced contraceptive efficacy of estrogen/progestin products during isotretinoin therapy. Direction: possible decreased contraceptive effect; PK/PD changes to estrogens and progestins are small but highly variable and unpredictable. Neither agent's mechanism is established (theoretical, mechanism unknown).
- Onset: unspecified.
- Evidence: theoretical, supported by post-marketing pregnancy reports, more frequent with a single contraceptive method.
- Management: require two simultaneous forms of contraception (unless abstinence or hysterectomy). Micro-dosed progestin-only minipills may be inadequate. Reinforce pregnancy-prevention counseling per iPLEDGE requirements given isotretinoin teratogenicity.
What happens
Decreased effectiveness of hormonal contraceptives
Interaction Deep Dive
The pharmacokinetic and pharmacodynamic effects on estrogens and progestins that occur with concurrent isotretinoin use are minor, yet they vary greatly and cannot be reliably predicted. Cases of pregnancy have been documented in women relying on combined oral contraceptives, along with those using topical, injectable, implantable, or insertable hormonal contraceptive products. These pregnancies have been noted more often among individuals depending on only one contraceptive method. The likelihood of contraceptive failure while taking isotretinoin is increased with micro-dosed progestin-only pills. Female patients capable of becoming pregnant are required to employ 2 contraceptive methods at the same time during isotretinoin treatment, and one of these must be: tubal ligation, a partner's vasectomy, intrauterine devices, birth control pills, or topical/injectable/implantable/insertable hormonal contraceptive products123.
Why it happens (mechanism)
Unknown
How to manage this interaction
The main goal here is preventing pregnancy, since isotretinoin can cause serious birth defects and may also make hormonal birth control less reliable.
- Use two forms of contraception at the same time throughout isotretinoin treatment, unless you have agreed to complete abstinence or have had a hysterectomy.
- One method should be highly effective, such as birth control pills, an IUD, an implant/injection, tubal ligation, or a partner's vasectomy.
- Progestin-only minipills (no estrogen) may not be enough on their own.
- Keep taking your medicines as prescribed, and ask your prescriber or pharmacist to review your contraception plan before you start.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
2 reports — tap to read
a) In one study, isotretinoin showed no interaction with oral contraceptives. Nine women receiving isotretinoin 0.5 mg/kg for severe pustular acne had been taking oral contraceptives (brand unknown) for at least three months before beginning isotretinoin therapy. As measured by radioimmunoassay, plasma concentrations of ethinyl estradiol and levonorgestrel were comparable in the control cycle and in two cycles following the initiation of isotretinoin 4.
b) When isotretinoin was administered together with a combination ethinyl estradiol/norethindrone product, the pharmacokinetic and pharmacodynamic changes were inconsistent and comparatively small. In a single-center, open-label drug interaction study, 26 healthy women completed a protocol in which they received ethinyl estradiol/norethindrone oral contraceptive (OC) triphasic tablets (35 micrograms and 0.5/0.75/1 milligrams, respectively) each day. Beginning at the third month, and after pregnancy had been excluded, participants additionally received isotretinoin 1 milligrams/kilogram/day in two divided doses to complete 16 to 20 weeks of isotretinoin treatment for severe, recalcitrant nodular acne. Compared with the OC alone phase, plasma concentrations of ethinyl estradiol and norethindrone were slightly lower (9% and 11%, respectively) during the OC plus isotretinoin phase; however, patient variability was high. Follicle stimulating hormone concentration fell 44% (p=0.03) with the addition of isotretinoin, again with considerable variability; serum progesterone and luteinizing hormone levels remained unchanged. No pregnancies were reported 5.
Common questions
Can I take Ethinyl Estradiol and Isotretinoin together?
Hormonal birth control may be less reliable during isotretinoin, and isotretinoin can cause serious birth defects, so use two forms of contraception at the same time and confirm your plan with your care team before starting. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Ethinyl Estradiol and Isotretinoin interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Ethinyl Estradiol and Isotretinoin interaction managed?
The main goal here is preventing pregnancy, since isotretinoin can cause serious birth defects and may also make hormonal birth control less reliable. Use two forms of contraception at the same time throughout isotretinoin treatment, unless you have agreed to complete abstinence or have had a hysterectomy. One method should be highly effective, such as birth control pills, an IUD, an implant/injec… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Ethinyl Estradiol or Isotretinoin need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (5)
- Product Information: Amnesteem(R) oral capsules, isotretinoin oral capsules. Mylan Pharmaceuticals Inc, Morgantown, WV, 2010. DailyMed
- Product Information: Claravis(TM) oral capsules, isotretinoin oral capsules. Barr Laboratories, Inc, Pomona, NY, 2010. DailyMed
- Product Information: Sotret(R) oral capsules, isotretinoin oral capsules. Ranbaxy Laboratories Inc. Jacksonville, FL, 2010. DailyMed
- Orme M, Back DJ, & Shaw MA: Isotretinoin and contraception. Lancet 1984; 2:752-753. PubMed
- Hendrix CW, Jackson KA, Whitmore E, et al: The effect of isotretinoin on the pharmacokinetics and pharmacodynamics of ethinyl estradiol and norethindrone. Clin Pharmacol Ther 2004; 75:464-75. PubMed
Keep reading about Ethinyl Estradiol
Keep reading about Isotretinoin
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