Desogestrel/Ethinyl Estradiol Drug Interactions: What to Avoid and What to Tell Your Doctor

Desogestrel/ethinyl estradiol -- known by brand names like Apri, Reclipsen, Kariva, Mircette, and Azurette -- has a significant number of documented drug interactions. Some reduce the pill's effectiveness, potentially leading to unintended pregnancy. Others increase the risk of side effects or can cause serious medical complications. This guide covers the most clinically important interactions you need to know.

Medications That Reduce Contraceptive Effectiveness (Major Risk)

The following medications speed up liver enzymes (primarily CYP3A4) that break down the hormones in the pill, causing blood levels to drop below the threshold needed to suppress ovulation. If you take any of these, discuss alternative or additional contraceptive methods with your provider:

Rifampin (rifampicin): An antibiotic used to treat tuberculosis and certain other bacterial infections. One of the most potent reducers of oral contraceptive efficacy. Non-hormonal backup contraception is required during rifampin therapy and for 28 days after stopping.

Anticonvulsants (carbamazepine, phenytoin, phenobarbital, primidone, oxcarbazepine, felbamate, topiramate): These epilepsy and mood-stabilizer medications are enzyme inducers that reduce hormone blood levels. Women on these medications should use an alternative, highly effective contraceptive method such as a hormonal IUD, copper IUD, or depot medroxyprogesterone acetate injection.

St. John's Wort (hypericum perforatum): This popular herbal supplement for depression and anxiety induces CYP3A4 and can substantially reduce blood levels of both desogestrel and ethinyl estradiol. Use non-hormonal backup contraception while taking St. John's Wort.

Some HIV medications (ritonavir-boosted regimens): Ritonavir and other protease inhibitors can both induce and inhibit enzymes that metabolize oral contraceptive hormones, leading to unpredictable hormone levels. Consult your HIV specialist and gynecologist together about the safest contraceptive option.

Medications That Are Contraindicated (Do Not Use Together)

The following should NOT be used at the same time as desogestrel/ethinyl estradiol due to the risk of serious harm:

Ombitasvir/paritaprevir/ritonavir with or without dasabuvir (Viekira Pak, Technivie): This Hepatitis C combination regimen is contraindicated with ethinyl estradiol-containing products. In clinical trials, co-administration caused ALT liver enzyme elevations greater than 5 times the upper limit of normal, with some cases exceeding 20 times the upper limit. Stop desogestrel/ethinyl estradiol before starting this treatment and do not restart until approximately 2 weeks after completing the HCV regimen.

Glecaprevir/pibrentasvir (Mavyret): Co-administration is not recommended due to potential for ALT elevations. Use non-hormonal contraception during treatment with this HCV regimen.

Medications Whose Levels Are Affected by the Pill

The pill does not just interact with other drugs -- it can alter the blood levels of other medications you are already taking:

Lamotrigine (Lamictal): Combination oral contraceptives induce the glucuronidation of lamotrigine, significantly reducing its blood concentration -- sometimes by 50% or more. This can reduce seizure control in women using lamotrigine for epilepsy. Lamotrigine dosing should be reassessed when starting, stopping, or changing hormonal contraceptives. Stopping the pill can cause lamotrigine levels to spike, potentially causing toxicity.

Thyroid hormone replacement (levothyroxine): Ethinyl estradiol increases thyroid-binding globulin (TBG), which binds and inactivates more thyroid hormone. Women on thyroid replacement who start taking the pill may need higher levothyroxine doses. Thyroid function should be checked when starting or stopping oral contraceptives.

Cyclosporine: Oral contraceptives may inhibit metabolism of cyclosporine, leading to increased cyclosporine blood levels and potential toxicity. Monitor cyclosporine levels if hormonal contraceptives are started or stopped.

Food and Supplement Interactions

Grapefruit juice: Inhibits CYP3A4 enzymes in the intestinal wall, potentially increasing ethinyl estradiol absorption. This is unlikely to cause serious harm at normal intake levels but may contribute to estrogen-related side effects. No specific restrictions are required, but large quantities of grapefruit juice should be approached with awareness.

Vitamin C (ascorbic acid): High-dose vitamin C (1,000 mg or more) taken at the same time as the pill may temporarily increase ethinyl estradiol absorption. This is generally not a safety concern at supplement doses.

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What to Tell Your Doctor and Pharmacist

Always disclose your desogestrel/ethinyl estradiol use when seeing any healthcare provider, including specialists, urgent care providers, and dentists who may prescribe antibiotics. When picking up a new prescription, tell the pharmacist you are on oral contraceptives so they can screen for interactions using their drug interaction software.

In particular, alert your provider or pharmacist if you are prescribed: any antibiotic (particularly rifampin), any antiepileptic drug, any HIV medication, any Hepatitis C combination treatment, or any herbal supplement including St. John's Wort.

Related: Desogestrel/ethinyl estradiol side effects | How desogestrel/ethinyl estradiol works.