Seasonique Drug Interactions: What to Avoid and What to Tell Your Doctor

Seasonique can interact with a number of medications, supplements, and herbal products. Some of these interactions can make Seasonique less effective at preventing pregnancy; others can cause serious health risks. This guide covers everything you need to know and what to discuss with your doctor.

Why Drug Interactions Matter for Seasonique

Both levonorgestrel (the progestin) and ethinyl estradiol (the estrogen) in Seasonique are metabolized primarily by the CYP3A4 enzyme system in the liver. Drugs or supplements that speed up CYP3A4 activity (called enzyme inducers) cause the hormones to be broken down faster — lowering their blood levels and potentially allowing ovulation to occur. Drugs that slow CYP3A4 (inhibitors) can increase hormone levels, potentially heightening side effects.

Medications That Reduce Seasonique's Effectiveness (Major Interactions)

These medications significantly reduce the effectiveness of Seasonique. Use reliable backup contraception (such as condoms) while taking them and for several weeks after stopping:

• Rifampin (Rifadin): Used for tuberculosis. One of the strongest CYP3A4 inducers. Can reduce levonorgestrel and ethinyl estradiol levels dramatically, significantly increasing the risk of contraceptive failure. Use an additional non-hormonal contraceptive method for the entire treatment period and for 28 days after stopping rifampin.
• Phenytoin (Dilantin), carbamazepine (Tegretol), phenobarbital, primidone: Antiepileptic drugs that induce CYP3A4. Can significantly reduce hormonal contraceptive effectiveness. Patients on these medications often need non-hormonal contraception or a copper IUD.
• St. John's Wort (Hypericum perforatum): A widely used herbal supplement for depression and anxiety. A significant CYP3A4 inducer that can reduce hormonal contraceptive levels. The FDA has specifically warned that St. John's Wort can reduce oral contraceptive effectiveness and cause breakthrough bleeding. Stop using St. John's Wort while on Seasonique.
• Certain HIV antiretrovirals: Some protease inhibitors and non-nucleoside reverse transcriptase inhibitors (NNRTIs) can either reduce or increase Seasonique hormone levels depending on the specific agent. Patients on HIV medications should consult their HIV specialist and prescribing provider before using hormonal contraceptives.

Contraindicated Drug Combinations (Serious Safety Risks)

These combinations are specifically contraindicated or strongly not recommended with Seasonique:

• Ombitasvir/paritaprevir/ritonavir with or without dasabuvir (Viekira Pak, Technivie): This hepatitis C drug combination is CONTRAINDICATED with Seasonique. Co-administration can cause ALT (liver enzyme) elevations greater than 5 times the upper limit of normal, including some cases exceeding 20 times ULN. Discontinue Seasonique at least 2 weeks before starting this HCV regimen and restart no earlier than 2 weeks after completing it.
• Glecaprevir/pibrentasvir (Mavyret): Co-administration with Seasonique is not recommended due to potential for ALT elevations.

Medications That Increase Seasonique's Hormone Levels (Moderate Interactions)

Some medications slow down hormone metabolism and increase estradiol levels, potentially worsening estrogen-related side effects like nausea and breast tenderness:

• Atorvastatin (Lipitor): Co-administration with certain COCs can increase ethinyl estradiol AUC by approximately 20%. Monitor for increased estrogen-related side effects.
• Acetaminophen (Tylenol): May increase plasma ethinyl estradiol concentrations by inhibiting conjugation. The effect is generally minor and does not usually require dose adjustment.
• CYP3A4 inhibitors (itraconazole, ketoconazole): Antifungal medications that inhibit CYP3A4 may increase plasma hormone levels. Monitor for increased side effects.

Seasonique's Effect on Other Medications

Seasonique can also affect the blood levels of other medications you take:

• Lamotrigine (Lamictal): COCs significantly decrease lamotrigine plasma concentrations, likely through induction of lamotrigine glucuronidation. This can reduce seizure control in patients using lamotrigine for epilepsy or bipolar disorder. Dose adjustments may be needed. Do not adjust your lamotrigine dose without consulting your prescribing provider.
• Cyclosporine: COCs can increase cyclosporine levels. Monitor for cyclosporine toxicity if you take this immunosuppressant.
• Thyroid medications: Estrogen-containing contraceptives increase thyroid-binding globulin, which can affect thyroid function test results. Patients on thyroid replacement therapy may need dose adjustments.

What About Antibiotics?

The relationship between common antibiotics and oral contraceptive effectiveness has been debated for decades. Current evidence does NOT support a clinically significant interaction between most antibiotics (such as amoxicillin, doxycycline, tetracycline, and ciprofloxacin) and combined oral contraceptives. The notable exception is rifampin, which is a powerful enzyme inducer and definitely reduces contraceptive effectiveness.

That said, many providers still recommend using backup contraception during short courses of antibiotics as a precaution, especially if you have concerns about perfect pill adherence.

What to Tell Every Provider You See

Always tell every provider (including dentists, urgent care providers, and telehealth doctors) that you take Seasonique. Also disclose:

• All prescription medications (especially seizure meds, HIV antiretrovirals, HCV treatments)
• Over-the-counter medications (especially acetaminophen at high doses)
• Herbal supplements (especially St. John's Wort)
• Vitamins and dietary supplements

For a complete list of Seasonique side effects beyond drug interactions, see our guide on Seasonique side effects.

If you're having trouble finding Seasonique in stock, medfinder calls pharmacies near you to check availability.