Most people on Biktarvy take other medications too — for cholesterol, diabetes, pain, infections, or mental health. Most are completely fine. A few need to be timed carefully around your dose. 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. Lowers bictegravir levels by about 75%, 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, Antacids, and the Timing Rules
The most common question people have is about supplements and antacids. Certain minerals — aluminum, magnesium, calcium, iron, and zinc — can bind to Biktarvy in your stomach and reduce how much of the drug reaches your bloodstream. How you handle this depends on which mineral is involved.
- Aluminum or magnesium (antacids like Maalox, Mylanta, Milk of Magnesia; magnesium supplements) — the strongest effect. Take Biktarvy at least 2 hours before, or at least 6 hours after. Taking Biktarvy 2 hours after is not enough.
- Calcium or iron (supplements, Tums, iron tablets) — easiest to handle: take them with food, which prevents the interaction, or take Biktarvy 2 hours before them.
- Zinc and mineral-containing multivitamins — less studied; take them with food, or separate from Biktarvy by at least 2 hours.
Common Questions, Answered
Not at the same time. Magnesium binds to Biktarvy in your gut and reduces absorption — and the effect is strong, so the timing is one-directional. Take Biktarvy at least 2 hours before magnesium, or at least 6 hours after. Taking Biktarvy shortly after magnesium is not enough. This applies to any form of magnesium and to magnesium-containing antacids.
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 concentrated calcium supplements taken on an empty stomach — not the amount of calcium in a normal serving of dairy, which also comes with food.
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 |
| Aluminum/magnesium antacids (Maalox, Milk of Magnesia) | Strict timing | Biktarvy 2 hrs before, or 6 hrs after |
| Magnesium supplements | Strict timing | Biktarvy 2 hrs before, or 6 hrs after |
| Calcium supplements & antacids (Tums) | Take with food | With food, or Biktarvy 2 hrs before; a glass of milk is fine |
| Iron supplements | Take with food | With food, or Biktarvy 2 hrs before |
| Multivitamins with minerals | Timing/food | With food at a different time, or 2 hrs apart; wider gap if it has Al/Mg |
| 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 |
| Statins (atorvastatin, rosuvastatin, etc.) | Safe | No clinically significant interaction; standard doses |
| 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 |
Statins and Cholesterol Medications
Good news: Biktarvy does not have a clinically significant interaction with statins. Older “boosted” HIV regimens — those containing ritonavir or cobicistat — do require statin dose limits, and this is a common point of confusion. Biktarvy is unboosted and does not meaningfully change statin levels.
- Atorvastatin, rosuvastatin, pravastatin, pitavastatin: can be used at their standard doses with Biktarvy — no Biktarvy-specific dose cap is required.
- Your doctor still chooses your statin and its dose based on your cholesterol and heart-disease risk, as they would for anyone.
If you are starting Biktarvy and already take a statin, you do not need a dose change for the Biktarvy itself — but always keep both your HIV doctor and your other prescribers aware of your full medication list.
Metformin and Diabetes Medications
Biktarvy raises metformin levels modestly — metformin exposure increases by about 39%. For most people with normal kidney function, no metformin dose change is needed, and the Biktarvy label does not set a metformin dose limit. If your kidney function is reduced, your doctor may monitor more closely or adjust your metformin dose, because metformin can rarely cause a serious side effect called lactic acidosis. It is reasonable for your doctor to check your kidney function around the time you start Biktarvy.
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
Can I take magnesium with Biktarvy?
Not at the same time. Magnesium — like aluminum, calcium, iron, and zinc — can bind to Biktarvy in your stomach and reduce absorption. Aluminum and magnesium have the strongest effect, so the timing is not symmetric: take Biktarvy at least 2 hours before, or at least 6 hours after, magnesium (or a magnesium-containing antacid). Taking Biktarvy 2 hours after magnesium is not enough.
Can I take ibuprofen with Biktarvy?
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.
Can I take Tylenol (acetaminophen) with Biktarvy?
Yes. Tylenol does not interact with Biktarvy and is the preferred over-the-counter pain option for most people on HIV treatment.
Can I drink milk with Biktarvy?
Yes. The calcium in a glass of milk is not enough to interfere with Biktarvy absorption, and it comes with food. Concentrated calcium supplements taken on an empty stomach are the concern — not dairy with your meal.
Can I take doxycycline with Biktarvy?
Yes. Doxycycline does not interact with Biktarvy. It is commonly used alongside HIV treatment with no timing restrictions needed.
Do I need a dose change for my statin or metformin on Biktarvy?
Usually not. Unlike older “boosted” HIV regimens (those containing ritonavir or cobicistat), Biktarvy does not have a clinically significant interaction with statins, so atorvastatin, rosuvastatin, pravastatin, and others can be used at standard doses. Metformin levels rise modestly (about 39%), but the Biktarvy label sets no metformin dose limit for people with normal kidney function — closer monitoring is advised mainly if your kidney function is reduced.
Can I drink alcohol while taking Biktarvy?
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.
What is absolutely contraindicated with Biktarvy?
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 (bictegravir falls about 75% with rifampin) 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.
Can I take vitamins and supplements with Biktarvy?
It depends on what the supplement contains. Aluminum- or magnesium-containing products (including many antacids) have the strongest effect — take Biktarvy at least 2 hours before or 6 hours after them. Calcium and iron are easiest handled by taking them with food, or by taking Biktarvy 2 hours before them. Supplements without these minerals — vitamin C, vitamin D (without calcium), B vitamins, omega-3s — need no 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, MBBS, 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. 2025.
- The effect of antacid and mineral supplements on bictegravir pharmacokinetics: results from a Phase 1, open-label, drug–drug interaction study. 2025.
- DHHS Panel on Antiretroviral Guidelines. clinicalinfo.hiv.gov
- University of Liverpool HIV Drug Interaction Database. Accessed July 2026.