Norelgestromin 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
Isotretinoin
Norelgestromin
No brand names on record
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.
This one is really important. Norelgestromin is the hormone in some birth control (like the patch). Isotretinoin (Accutane) is a powerful acne medicine that can cause severe birth defects if you become pregnant while taking it. There is a concern that isotretinoin may make your hormonal birth control a little less reliable, and this can be unpredictable from person to person.
The good news is this is very manageable. Because pregnancy must be avoided during isotretinoin treatment, your care team will have you use two forms of birth control at the same time and will guide you closely. Please talk with your doctor or pharmacist about your specific birth control plan.
Effect: Potential decreased contraceptive effectiveness when norelgestromin (progestin) is combined with isotretinoin.
- Direction/mechanism: Small but highly variable and unpredictable PK/PD changes to estrogens and progestins; exact mechanism unknown. Neither agent is enzyme-dependent for activation here.
- Evidence: Theoretical; pregnancies have been reported, more often with a single contraceptive method. Micro-dosed progestin-only preparations are considered inadequate.
- Onset: Unspecified.
- Management: Per iPLEDGE/isotretinoin REMS, require two simultaneous forms of contraception (one a primary method) unless abstinent or post-hysterectomy. Counsel on pregnancy risk. Confirm negative pregnancy tests per protocol.
What happens
Decreased effectiveness of hormonal contraceptives
Interaction Deep Dive
The pharmacokinetic and pharmacodynamic effects on estrogens and progestins when given together with isotretinoin are minor, yet they vary widely and cannot be reliably predicted. Cases of pregnancy have been documented among women using combined oral contraceptives and also among those relying on topical, injectable, implantable, or insertable hormonal contraceptive products. These reports have been more common among individuals who depend on only one contraceptive method. Progestin-only pills that are micro-dosed increase the likelihood of contraceptive failure when taken alongside isotretinoin. Female patients capable of becoming pregnant must employ 2 forms of contraception at the same time while receiving isotretinoin, and one of these must be among the following: tubal ligation, a partner's vasectomy, intrauterine devices, birth control pills, or topical, injectable, implantable, or insertable hormonal birth control products123.
Why it happens (mechanism)
Unknown
How to manage this interaction
The key here is preventing pregnancy, since isotretinoin can cause serious birth defects. Your care team manages this with a clear, structured plan:
- Use two forms of contraception at the same time during isotretinoin therapy, unless you have agreed to complete abstinence or have had a hysterectomy.
- One should be a primary method such as an IUD, birth control pills, an implant/injectable/patch, tubal ligation, or a partner's vasectomy.
- Be aware that progestin-only mini-pills may not be reliable enough on their own during this treatment.
Keep using your birth control as prescribed and follow the required pregnancy-testing program. Talk with your prescriber or pharmacist to confirm your two-method plan.
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 levels of ethinyl estradiol and levonorgestrel during the control cycle and during two cycles following the start of isotretinoin were comparable 4.
b) When isotretinoin was administered alongside a combination ethinyl estradiol/norethindrone product, pharmacokinetic and pharmacodynamic changes were inconsistent and relatively small. In a single-center, open-label drug interaction study, 26 healthy women completed a protocol in which they took ethinyl estradiol/norethindrone oral contraceptive (OC) triphasic tablets (35 micrograms and 0.5/0.75/1 milligrams, respectively) each day. At the beginning of the third month, and after pregnancy had been excluded, participants also received isotretinoin 1 milligrams/kilogram/day in two divided doses to complete 16 to 20 weeks of isotretinoin treatment for severe, recalcitrant nodular acne. Plasma concentrations of ethinyl estradiol and norethindrone were slightly lower (9% and 11%, respectively) during the OC plus isotretinoin phase versus the OC alone phase; however, patient variability was high. Follicle stimulating hormone concentration fell 44% (p=0.03) when isotretinoin was added to the regimen, again with substantial variability; serum progesterone and luteinizing hormone levels remained unchanged. No pregnancies were reported 5.
Common questions
Can I take Norelgestromin and Isotretinoin together?
Isotretinoin may make hormonal birth control less reliable, so you must use two forms of contraception at the same time and follow the required pregnancy-prevention program. Confirm your specific plan with your prescriber or pharmacist. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Norelgestromin 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 Norelgestromin and Isotretinoin interaction managed?
The key here is preventing pregnancy, since isotretinoin can cause serious birth defects. Your care team manages this with a clear, structured plan: Use two forms of contraception at the same time during isotretinoin therapy, unless you have agreed to complete abstinence or have had a hysterectomy. One should be a primary method such as an IUD, birth control pills, an implant/injectable/patch, tub… 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 Norelgestromin 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 Isotretinoin
Keep reading about Norelgestromin
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