Drug Interactions With Apri 28 Day: What You Need to Know

Taking Apri 28 Day (Desogestrel 0.15 mg / Ethinyl Estradiol 0.03 mg) is straightforward — one pill, same time, every day. But certain medications, supplements, and even foods can interfere with how well it works or increase your risk of side effects. Knowing what to watch for can help you stay protected.

How Drug Interactions Work With Birth Control

Most drug interactions with combined oral contraceptives like Apri 28 Day fall into two categories:

1. Medications that reduce Apri's effectiveness — These speed up how your liver processes the hormones, leading to lower hormone levels in your blood. Lower hormone levels can mean breakthrough bleeding, spotting, or — most importantly — contraceptive failure.
2. Medications affected by Apri — Apri 28 Day can change how your body processes other drugs, making them less effective or increasing their side effects.

The liver enzyme system responsible for breaking down many drugs (called CYP450) is the key player in most of these interactions. Drugs that rev up these enzymes (called "inducers") can lower hormone levels significantly.

Medications That Interact With Apri 28 Day

Major Interactions — Use Backup Contraception or an Alternative Method

These medications can significantly reduce the effectiveness of Apri 28 Day. If you take any of these, talk to your provider about using backup contraception or switching to a non-oral method:

• Rifampin (Rifadin) and Rifabutin (Mycobutin) — Used for tuberculosis and some other infections. Rifampin is the single most potent reducer of oral contraceptive effectiveness. Even short courses can compromise protection.
• Anticonvulsants:
  • Phenytoin (Dilantin)
  • Carbamazepine (Tegretol)
  • Phenobarbital
  • Topiramate (Topamax) — at doses above 200 mg/day
  • Felbamate (Felbatol)
  • Oxcarbazepine (Trileptal)
  These seizure medications increase liver enzyme activity and can lower contraceptive hormone levels significantly.
• Barbiturates — Including phenobarbital and other sedatives in this class.
• HIV protease inhibitors and NNRTIs — Some HIV medications (like ritonavir, nelfinavir, nevirapine, and efavirenz) can alter hormone levels. If you're on HIV treatment, work with your provider to find a compatible contraceptive method.
• Hepatitis C antivirals — Specifically combinations containing ombitasvir/paritaprevir/ritonavir (Viekira Pak). This combination is contraindicated with Apri 28 Day due to the risk of dangerous ALT (liver enzyme) elevations. Do not take these together.
• Griseofulvin — An antifungal that may reduce oral contraceptive effectiveness.

Moderate Interactions — Monitor and Discuss With Your Provider

• Certain antibiotics (Ampicillin, Tetracycline) — The evidence on whether common antibiotics reduce pill effectiveness is debated. Most research suggests the risk is very low, but some providers recommend backup contraception during antibiotic courses as a precaution. Note: Rifampin is the major concern — most other antibiotics are not proven to significantly interact.
• Lamotrigine (Lamictal) — This is a two-way interaction. Apri 28 Day can lower lamotrigine levels by 40-60%, potentially reducing seizure control. If you take Lamotrigine, your neurologist and prescriber need to coordinate closely. Lamotrigine doses often need to be adjusted when starting or stopping oral contraceptives.
• Acetaminophen (Tylenol) — Oral contraceptives may decrease acetaminophen's effectiveness by speeding up its metabolism.
• Thyroid hormone replacement (Levothyroxine) — Oral contraceptives may increase thyroid-binding proteins, potentially requiring a dose adjustment of your thyroid medication. Have your TSH checked after starting Apri 28 Day.

Supplements and Over-the-Counter Products to Watch

• St. John's Wort — This is the most important supplement interaction. St. John's Wort is a potent liver enzyme inducer and can significantly reduce the effectiveness of Apri 28 Day. It's sold over the counter for mood support, but if you're on birth control, do not take it. Use alternatives for mood support and discuss options with your provider.
• Vitamin C (Ascorbic Acid) in high doses — Large doses (1,000 mg+) of vitamin C may increase ethinyl estradiol levels, potentially increasing estrogen-related side effects like nausea or headaches. Normal dietary intake and standard multivitamin doses are fine.

Food and Drink Interactions

• Grapefruit juice — Grapefruit inhibits the CYP3A4 enzyme, which can increase estrogen levels in your blood. Occasional grapefruit consumption is unlikely to cause problems, but daily large quantities may increase estrogen-related side effects. Moderate consumption is generally fine.
• Alcohol — Alcohol does not directly interact with Apri 28 Day's effectiveness. However, excessive alcohol consumption can lead to vomiting, which can reduce absorption of the pill if it occurs within 2 hours of taking your dose.

What to Tell Your Doctor

To avoid dangerous interactions, make sure every healthcare provider you see knows you're taking Apri 28 Day. Here's a practical checklist:

• Before any new prescription: Tell the prescriber you're on a combined oral contraceptive containing desogestrel and ethinyl estradiol.
• Before surgery: Your surgeon may want you to stop Apri 28 Day 4-6 weeks before major surgery (especially procedures requiring prolonged immobilization) to reduce blood clot risk.
• At the pharmacy: Make sure your pharmacist knows all your medications. Many pharmacies run automatic interaction checks, but only if your medication list is complete.
• Supplements and OTC products: Don't assume "natural" means safe to combine. Specifically mention St. John's Wort, high-dose vitamin C, and any herbal supplements.
• Specialist visits: If you see a neurologist (for seizure medications), infectious disease doctor (for HIV or TB treatment), or hepatologist (for hepatitis C), make sure they know you're on Apri 28 Day.

If you're prescribed a medication that interacts with Apri 28 Day, your provider may recommend:

• Using backup contraception (condoms) during treatment and for 7-28 days after
• Switching to a progestin-only or non-hormonal contraceptive method
• Adjusting doses of the interacting medication

Final Thoughts

Most medications are perfectly safe to take alongside Apri 28 Day. The major interactions to remember are: rifampin, certain anticonvulsants, St. John's Wort, and hepatitis C antivirals containing ombitasvir/paritaprevir/ritonavir. These can significantly reduce your birth control's effectiveness or cause dangerous side effects.

When in doubt, ask your pharmacist — they're often the best resource for catching drug interactions in real time.

For more about this medication, see What Is Apri 28 Day? or our side effects guide. Ready to fill your prescription? Visit Medfinder to find Apri 28 Day near you.