Norethindrone 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
Norethindrone
Isotretinoin
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 what to know. Isotretinoin (Accutane and similar brands) is a very strong acne medicine that can cause severe birth defects if you get pregnant while taking it. Norethindrone is a hormone in some birth control pills, including progestin-only 'mini-pills.' The concern is that birth control may not work as reliably during isotretinoin treatment, and there have been reports of pregnancy even in women using hormonal birth control.
The good news is that this is very manageable. Because pregnancy must be avoided completely, the standard rule is to use two forms of birth control at the same time. Please talk with your prescriber or pharmacist so they can set up the right plan for you.
Effect: Potential decreased contraceptive efficacy of norethindrone-containing products during isotretinoin therapy.
- Mechanism: Unknown. PK/PD changes to progestins/estrogens are reported as small but highly variable and unpredictable. Neither agent is a prodrug relevant here.
- Direction: Reduced effect (contraceptive failure risk).
- Evidence: Theoretical, but supported by post-marketing pregnancy reports; rating major given teratogenic consequences.
- High-risk group: Micro-dosed progestin-only pills (no estrogen) may be inadequate.
- Management: Per iPLEDGE, patients of childbearing potential must use 2 simultaneous forms of contraception (one being a primary method), or absolute abstinence. Counsel on pregnancy-risk behaviors and required monthly pregnancy testing.
What happens
Decreased effectiveness of hormonal contraceptives
Interaction Deep Dive
The pharmacokinetic and pharmacodynamic effects on estrogens and progestins that occur when isotretinoin is given together are minor, yet they show wide variability 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 reports have been more common among individuals depending on only one contraceptive method. The likelihood of contraceptive failure is increased by micro-dosed progestin-only pills when they are taken alongside isotretinoin. Female patients who are able to become pregnant must, while receiving isotretinoin, employ 2 contraceptive methods at the same time, with one of them 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 taking both exactly as prescribed and work with your care team on a contraception plan. Because isotretinoin can cause serious birth defects, avoiding pregnancy is essential.
- Use two forms of birth control at the same time during treatment (unless you have agreed to complete abstinence or have had a hysterectomy).
- One method should be a primary form such as birth control pills, an IUD, a hormonal implant/injection/patch, tubal ligation, or a partner's vasectomy.
- Be aware that progestin-only mini-pills alone may not be enough.
- Ask your prescriber or pharmacist about required pregnancy testing and the enrollment program (iPLEDGE) before starting.
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. Plasma concentrations of ethinyl estradiol and levonorgestrel measured by radioimmunoassay were comparable in the control cycle and in two cycles following the start of isotretinoin therapy 4.
b) When isotretinoin was administered together with 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, and after pregnancy had been excluded, the 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. During the OC plus isotretinoin phase, ethinyl estradiol and norethindrone plasma concentrations were slightly lower (9% and 11%, respectively) than in the OC alone phase, though patient variability was high. Follicle stimulating hormone concentration fell 44% (p=0.03) when isotretinoin was added to the regimen, once more with substantial variability; serum progesterone and luteinizing hormone levels remained unchanged. No pregnancies were reported 5.
Common questions
Can I take Norethindrone and Isotretinoin together?
Isotretinoin can make hormonal birth control less reliable, so use two forms of contraception at the same time and confirm the plan with your prescriber. A progestin-only mini-pill alone is not considered adequate. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Norethindrone 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 Norethindrone and Isotretinoin interaction managed?
Keep taking both exactly as prescribed and work with your care team on a contraception plan. Because isotretinoin can cause serious birth defects, avoiding pregnancy is essential. Use two forms of birth control at the same time during treatment (unless you have agreed to complete abstinence or have had a hysterectomy). One method should be a primary form such as birth control pills, an IUD, a horm… 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 Norethindrone 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 Norethindrone
Keep reading about Isotretinoin
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