Yasmin 28 Drug Interactions: What to Avoid and What to Tell Your Doctor

Yasmin 28 (drospirenone/ethinyl estradiol) can interact with a number of medications, herbal supplements, and even certain foods. These interactions fall into two main categories: interactions that reduce Yasmin 28's contraceptive effectiveness (leading to possible unintended pregnancy), and interactions that increase the risk of side effects — particularly elevated potassium levels (hyperkalemia).

Always give your provider and pharmacist a complete list of everything you take — including over-the-counter medications, vitamins, and herbal supplements — before starting Yasmin 28.

Drugs That Reduce Yasmin 28's Effectiveness (CYP3A4 Inducers)

The following medications speed up the liver enzymes (particularly CYP3A4) that break down estrogen and drospirenone. When these hormones are metabolized faster, blood levels drop — and so does Yasmin 28's contraceptive effectiveness. If you take any of these, use a backup contraception method or switch to a non-hormonal contraceptive:

Rifampin (rifampicin): An antibiotic used for tuberculosis. The most potent interactor — can reduce hormonal contraceptive efficacy by up to 90%. Use a non-hormonal method (IUD, condoms) during TB treatment. Avoid Yasmin 28 during rifampin courses.

Anticonvulsants (seizure medications): Carbamazepine (Tegretol), phenytoin (Dilantin), phenobarbital, topiramate (Topamax at ≥200mg/day), and oxcarbazepine all induce CYP3A4 and reduce contraceptive efficacy. Use backup contraception and discuss alternatives with your neurologist and OB/GYN. Note: lamotrigine levels can be reduced by COCs, which may increase seizure risk.

St. John's Wort (herbal supplement): This popular herbal supplement for depression is a known CYP3A4 inducer. It can reduce hormone levels and lead to breakthrough bleeding and contraceptive failure. Avoid St. John's Wort while on Yasmin 28.

Certain HIV medications: Some antiretrovirals, including efavirenz, nevirapine, and ritonavir-boosted regimens, can reduce ethinyl estradiol levels. Discuss alternative contraception with your HIV care team.

Aprepitant (anti-nausea medication): Used for chemotherapy-induced nausea; may reduce contraceptive efficacy.

Drugs That Raise Potassium (Hyperkalemia Risk)

Drospirenone has antimineralocorticoid activity — it blocks aldosterone, which normally promotes potassium excretion. When combined with other medications that also raise potassium, the result can be dangerous hyperkalemia (high potassium). Your prescriber should check your potassium levels during the first month of Yasmin 28 if you take any of the following daily for a chronic condition:

Potassium-sparing diuretics: Spironolactone (Aldactone), eplerenone (Inspra), amiloride (Midamor), triamterene (Dyrenium) — additive potassium-retaining effects.

ACE inhibitors: Lisinopril, enalapril, ramipril, and others — used for hypertension and heart failure.

ARBs (angiotensin receptor blockers): Losartan, valsartan, olmesartan — also used for hypertension.

Heparin: Used for blood clot prevention/treatment — can raise potassium when combined with drospirenone.

NSAIDs (long-term daily use): Ibuprofen (Advil, Motrin), naproxen (Aleve) — when taken daily for chronic conditions like arthritis. Occasional use for pain is generally fine.

Potassium supplements / salt substitutes: Avoid potassium supplements unless prescribed; many salt substitutes (like NuSalt) are high in potassium.

Absolute Contraindication: Hepatitis C Antivirals

Yasmin 28 is contraindicated with Hepatitis C drug combinations containing ombitasvir/paritaprevir/ritonavir (with or without dasabuvir — medications like Viekira Pak and Technivie). Co-administration can cause significant ALT (liver enzyme) elevations. Do not use Yasmin 28 if you are taking these HCV treatments.

A Note About Common Antibiotics

You may have heard that antibiotics reduce birth control effectiveness. For most common antibiotics (amoxicillin, azithromycin, doxycycline), current evidence does NOT support this concern — they do not meaningfully reduce ethinyl estradiol levels or contraceptive efficacy. The one major exception is rifampin. If you're taking a short course of a non-rifampin antibiotic for an infection, you do not need backup contraception based on the antibiotic alone.

What to Tell Your Doctor

Always tell your prescriber and pharmacist if you take:

Any prescription medications for blood pressure, seizures, HIV, or mental health

Any herbal supplements (especially St. John's Wort)

Potassium supplements or potassium-containing salt substitutes

Any over-the-counter pain medications taken on a daily basis

For a full list of Yasmin 28 side effects to monitor, see our side effects guide. If you need help locating Yasmin 28 at a pharmacy, medfinder can find one near you.