Most people on Biktarvy take other medications too — for cholesterol, diabetes, pain, infections, or mental health. Some of these are completely fine. Some need to be timed carefully. And a small number cannot be taken with Biktarvy at all. This guide walks through the most common questions in plain language, so you know exactly what to watch for and what to discuss with your doctor.
For a full clinical breakdown including pharmacokinetic data and AUC tables, see our complete Biktarvy drug interactions guide.
The Four Things You Cannot Take With Biktarvy
These are absolute contraindications — not dose adjustments or timing rules. If you are prescribed any of the following, contact your HIV doctor before taking them.
- Rifampin (Rifadin) — antibiotic used to treat tuberculosis. Causes Biktarvy levels in your blood to drop so low that HIV can start replicating again and develop resistance to the medication.
- Rifapentine (Priftin) — another TB antibiotic with the same effect as rifampin on Biktarvy.
- Dofetilide (Tikosyn) — used to control heart rhythm. Biktarvy prevents dofetilide from clearing the body normally, allowing it to build up to levels that can cause a dangerous, potentially fatal heart rhythm problem.
- St. John’s Wort — an herbal supplement sold over the counter. Like rifampin, it reduces Biktarvy levels in the blood to the point where HIV treatment may fail.
Supplements and Vitamins: The Timing Rule
The most common question people have is about supplements. The rule is straightforward: anything containing magnesium, calcium, iron, aluminum, or zinc needs to be taken at least 2 hours apart from Biktarvy. These minerals can bind to Biktarvy in your stomach and reduce how much of the drug gets into your bloodstream.
The 2-hour rule applies to: magnesium supplements, calcium supplements, iron tablets, antacids (Tums, Maalox, Rolaids), multivitamins containing these minerals, and zinc supplements or lozenges.
Take Biktarvy first and wait 2 hours before taking the supplement, or take the supplement 2 hours before Biktarvy. Either direction works.
Common Questions, Answered
Not at the same time. Magnesium binds to Biktarvy in your gut and reduces absorption. Separate them by at least 2 hours in either direction. This applies whether you take magnesium glycinate, magnesium citrate, or any other form.
Yes, for occasional use. Ibuprofen (Advil, Motrin) does not interact directly with Biktarvy. If you need pain relief often, mention this to your doctor, as regular NSAID use can affect kidney function over time.
Yes. Acetaminophen (Tylenol) does not interact with Biktarvy and is generally the preferred OTC pain reliever for people on HIV treatment. Use it at standard doses for headaches, fever, and pain.
Yes. A glass of milk with your tablet is fine. The concern about calcium applies to high-dose calcium supplements taken simultaneously — not the amount of calcium in a normal serving of dairy.
Yes. Doxycycline does not interact with Biktarvy. It is commonly prescribed alongside HIV treatment for bacterial infections, acne, or STI prevention without any timing adjustment or dose change needed.
Moderate alcohol does not directly interact with Biktarvy. The bigger concern is missing doses: taking Biktarvy at the same time every day is important for keeping HIV suppressed. Heavy or regular drinking can also affect liver and kidney function. Talk to your doctor if alcohol use is a regular part of your life.
Quick Reference Table
| Medication / Supplement | Status | What to do |
|---|---|---|
| Rifampin (Rifadin) | Never take | Contact your HIV doctor immediately if prescribed |
| Rifapentine (Priftin) | Never take | Contact your HIV doctor immediately if prescribed |
| Dofetilide (Tikosyn) | Never take | Requires antiretroviral regimen review before starting |
| St. John’s Wort | Never take | Stop immediately and tell your doctor |
| Magnesium supplements | 2-hr separation | Take Biktarvy first, wait 2 hrs, then take magnesium |
| Calcium supplements | 2-hr separation | Separate by 2 hours; a glass of milk is fine |
| Iron supplements | 2-hr separation | Separate by 2 hours in either direction |
| Antacids (Tums, Maalox) | 2-hr separation | Separate by 2 hours in either direction |
| Multivitamins with minerals | 2-hr separation | Separate if contains Ca, Mg, Fe, Zn, or Al |
| Ibuprofen (Advil, Motrin) | Safe | Occasional use fine; discuss regular use with doctor |
| Acetaminophen (Tylenol) | Safe | No interaction; preferred OTC pain reliever |
| Doxycycline | Safe | No timing adjustment needed |
| Milk / dairy food | Safe | No restriction; take Biktarvy with or without food |
| Hormonal contraceptives | Safe | No interaction documented |
| Methadone / buprenorphine | Safe | No dose adjustment required |
| Warfarin | Monitor INR | Check INR within 1–2 weeks of starting or stopping Biktarvy |
Statins and Cholesterol Medications
Biktarvy affects how certain statins are processed by the body. This does not mean statins cannot be used — it means some need a dose cap. Here is the summary:
- Atorvastatin: Can be used, maximum 40 mg per day. Start at 10 mg.
- Rosuvastatin: Can be used, maximum 20 mg per day. Start at 5 mg.
- Pravastatin: Preferred option — lowest interaction burden.
- Pitavastatin: Also preferred when higher potency is needed.
- Simvastatin / Lovastatin: Best avoided if alternatives exist.
If you are taking a statin and starting Biktarvy for the first time, tell your prescribing doctor. They may need to review your current statin dose before initiating treatment.
Metformin and Diabetes Medications
Biktarvy can raise metformin levels in the blood by approximately 79%, which increases the risk of a rare but serious side effect called lactic acidosis. If you take metformin, your doctor should cap the dose at 1,000 mg per day and check your kidney function before starting Biktarvy and every 3 to 6 months afterward.
Other common diabetes medications including insulin, glipizide, and sitagliptin do not have significant interactions with Biktarvy.
Antidepressants and Mental Health Medications
Most commonly prescribed antidepressants — including SSRIs such as sertraline, fluoxetine, and escitalopram — do not have clinically significant interactions with Biktarvy. Bupropion and mirtazapine are also generally safe. If you take any psychiatric medication, mention it to both your HIV doctor and your prescribing psychiatrist so both teams are aware of your full medication list.
Anticonvulsants and Seizure Medications
Several older seizure medications are not recommended with Biktarvy because they lower Biktarvy levels in the blood significantly. These include carbamazepine (Tegretol), phenytoin (Dilantin), phenobarbital, and oxcarbazepine. If you take any of these, your HIV doctor and neurologist need to coordinate before any changes are made. Safer alternatives for people on Biktarvy include lamotrigine (Lamictal), levetiracetam (Keppra), and gabapentin (Neurontin).
Frequently Asked Questions
Not at the same time. Magnesium — along with calcium, aluminum, iron, and zinc — can bind to Biktarvy in your stomach and prevent it from being absorbed properly. Separate magnesium supplements from Biktarvy by at least 2 hours in either direction. The same rule applies to antacids and multivitamins containing these minerals.
Yes, ibuprofen is generally safe with Biktarvy for occasional use. There is no significant drug interaction. If you need pain relief regularly, mention it to your doctor as long-term NSAID use can affect kidney function.
Yes. Tylenol does not interact with Biktarvy and is the preferred over-the-counter pain option for most people on HIV treatment.
Yes. The calcium in a glass of milk is not enough to interfere with Biktarvy absorption. High-dose calcium supplements taken at the exact same time are the concern — not dairy with your meal.
Yes. Doxycycline does not interact with Biktarvy. It is commonly used alongside HIV treatment with no timing restrictions needed.
Moderate alcohol does not directly interact with Biktarvy. The main risks are missing doses and the long-term effects of heavy drinking on liver and kidney health. Discuss regular alcohol use with your doctor.
Four things must never be taken with Biktarvy: rifampin, rifapentine (both TB antibiotics), dofetilide (a heart rhythm drug), and St. John’s Wort. Rifampin and rifapentine drop Biktarvy levels so severely that HIV can rebound and develop resistance. Dofetilide accumulates to levels that can cause a fatal heart arrhythmia. St. John’s Wort has the same mechanism as rifampin. If you are prescribed any of these, contact your HIV doctor before taking them.
Most supplements are fine. The exception is anything containing calcium, magnesium, iron, aluminum, or zinc — these must be separated from Biktarvy by at least 2 hours. Vitamin C, vitamin D (without calcium), B vitamins, and omega-3s do not need any timing adjustment. Avoid St. John’s Wort entirely.
How we reviewed this article:
This page was written by Ray Ashton and reviewed by Dr. Ranjit Mohan, MD, in accordance with SunnyPharma’s Editorial Policy. Content is checked for clinical accuracy against FDA prescribing information and current HIV treatment guidelines, and updated when guidance changes.
Read our editorial policy →References
- Gilead Sciences. Biktarvy US Prescribing Information. January 2024.
- DHHS Panel on Antiretroviral Guidelines. Updated January 2025. clinicalinfo.hiv.gov
- University of Liverpool HIV Drug Interaction Database. Accessed March 2026.
- Tseng A, et al. Drug–drug interactions between antiretrovirals and co-administered agents. Ther Drug Monit. 2023;45(1):14–35.