Norgestrel 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
Norgestrel
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 is an important safety point. Isotretinoin (Accutane and similar brands) can cause very serious birth defects, so preventing pregnancy during treatment is critical. Norgestrel is a progestin used for birth control. The worry here is that hormonal birth control may not always work reliably while you are on isotretinoin, and pregnancies have been reported even in people using it correctly.
The good news is this is very manageable. The standard rule is to use two forms of birth control at the same time during isotretinoin therapy. Please talk with your prescriber or pharmacist about the right combination for you, and do not stop or change anything on your own.
Effect: Potential decreased contraceptive efficacy of hormonal contraceptives (including norgestrel) during isotretinoin therapy.
Mechanism/direction: Unknown; PK/PD changes to estrogens and progestins are reported to be small but highly variable and unpredictable. Neither agent is meaningfully activated as a prodrug here.
Evidence: Theoretical, supported by post-marketing pregnancy reports, more frequent with a single contraceptive method.
- Progestin-only/micro-dosed pills may be inadequate.
- Isotretinoin is teratogenic; require 2 simultaneous forms of contraception (per iPLEDGE-type requirements) unless abstinence or hysterectomy.
- Counsel on adherence and pregnancy-risk behaviors.
What happens
Decreased effectiveness of hormonal contraceptives
Interaction Deep Dive
The pharmacokinetic and pharmacodynamic effects on estrogens and progestins that result from concurrent use with isotretinoin are minor, yet they show considerable variability and cannot be reliably predicted. There have been reports of pregnancy among women relying on combined oral contraceptives, as well as those using topical, injectable, implantable, or insertable hormonal contraceptive methods. These reports have been more common among individuals depending on only one contraceptive method. The likelihood of contraceptive failure is increased with micro-dosed progestin-only pills when taken alongside isotretinoin. Female patients capable of becoming pregnant are required to use 2 contraceptive methods at the same time while on isotretinoin, with one of these methods being: tubal ligation, a partner's vasectomy, intrauterine devices, birth control pills, or topical/injectable/implantable/insertable hormonal birth control products123.
Why it happens (mechanism)
Unknown
How to manage this interaction
Keep using your contraception as prescribed and follow your program's requirements closely.
- During isotretinoin therapy, the standard is to use two forms of contraception at the same time, unless you have chosen complete abstinence or have had a hysterectomy.
- One method should be a primary form such as birth control pills, an IUD, an implant/injectable, tubal ligation, or a partner's vasectomy.
- Be aware that progestin-only "minipills" (no estrogen) may not be reliable enough on their own.
Talk with your prescriber or pharmacist to confirm your two-method plan is set up correctly before and throughout treatment.
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 were comparable in the control cycle and in the two cycles following the start of isotretinoin 4.
b) When isotretinoin was administered alongside a combined ethinyl estradiol/norethindrone product, the pharmacokinetic and pharmacodynamic alterations were inconsistent and relatively minor. 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. Beginning at the start of the third month, once pregnancy had been ruled out, 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, although patient variability was high. Follicle stimulating hormone concentration fell 44% (p=0.03) with the addition of isotretinoin, again with substantial variability; serum progesterone and luteinizing hormone levels remained unchanged. No pregnancies were reported 5.
Common questions
Can I take Norgestrel and Isotretinoin together?
Isotretinoin may make hormonal birth control like norgestrel less reliable, and isotretinoin can cause severe birth defects, so use two forms of contraception at the same time and confirm your plan with your prescriber. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Norgestrel 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 Norgestrel and Isotretinoin interaction managed?
Keep using your contraception as prescribed and follow your program's requirements closely. During isotretinoin therapy, the standard is to use two forms of contraception at the same time, unless you have chosen complete abstinence or have had a hysterectomy. One method should be a primary form such as birth control pills, an IUD, an implant/injectable, tubal ligation, or a partner's vasectomy. Be… 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 Norgestrel 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 Norgestrel
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