Antiretroviral medicines can be affected by other medicines, supplements, and everyday products. These interactions are well documented and are managed routinely in HIV care. This guide explains why interactions occur, which categories matter most, and how a treating doctor addresses them.
The practical message is simple: everything being taken should be shared with the care team, including items bought without a prescription.
| Important note This article is general information about HIV treatment. It does not include dosing instructions and is not a substitute for medical advice. HIV medicines are prescription-only, and any change to a treatment plan is decided by a qualified doctor. |
Quick Summary / Key Takeaways
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Antiretroviral medicines can be affected by other medicines, supplements, and everyday products. These interactions are well documented and are managed routinely in HIV care. The practical message is simple: everything being taken should be shared with the care team, including items bought without a prescription.
The body processes most medicines through shared pathways, largely in the liver. When two medicines use the same pathway, one can change the level of the other. Some interactions lower the level of a medicine so it works less well, while others raise it and make effects more likely. Absorption in the stomach can also be affected.
| Category | Why it matters |
|---|---|
| Mineral-containing products | Antacids, calcium, iron, and some multivitamins can affect absorption of integrase inhibitors |
| Tuberculosis treatment | Rifampicin lowers levels of several antiretroviral medicines |
| Certain antibiotics and antifungals | Share processing pathways with some antiretroviral medicines |
| Herbal products | Some, including St John wort, can lower antiretroviral levels |
| Medicines for acidity | Can affect absorption of particular antiretroviral medicines |
| Cholesterol and heart medicines | Levels can be affected, particularly with boosted regimens |
Integrase inhibitors such as dolutegravir can bind to minerals like calcium, magnesium, iron, and aluminium, which reduces how much medicine is absorbed. This does not mean such products cannot be used, but the treating doctor or pharmacist advises on how to separate them.
Regimens containing a booster such as ritonavir deliberately slow how the body processes a medicine, which is how boosting works. The same effect extends to many other medicines, so boosted regimens involve a broader set of interactions. This is covered in protease inhibitors explained.
Rifampicin, a core part of tuberculosis treatment, speeds up the processing of several antiretroviral medicines and lowers their levels. The treating doctor adjusts the treatment plan so both conditions are managed effectively. Related information is in HIV and TB co-treatment.
| Myth | Fact |
|---|---|
| Only prescription medicines interact. | Supplements and over-the-counter products can also interact. |
| Herbal products are always neutral. | Some, including St John wort, can lower antiretroviral levels. |
| An interaction means the product can never be used. | Many are managed by adjusting timing or selecting an alternative. |
| Interactions are unpredictable. | They are well documented and managed routinely in HIV care. |
| Only new medicines need mentioning. | Everything being taken should be shared, including long-standing items. |
| When to Consult a Doctor Advice should be sought before starting any new medicine, supplement, or herbal product, before treatment for another condition begins, and where a pharmacist raises a query. A consultation can be arranged through an HIV doctor consultation. |
Interactions with ART are common, well documented, and manageable. They arise because medicines share the pathways the body uses to process them, and because some products affect absorption. Sharing a complete list of everything being taken, including supplements and over-the-counter items, is what allows a treating doctor to manage them effectively.
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An interaction occurs when another medicine, supplement, or product changes how an antiretroviral medicine works, or the other way round. Levels of one medicine may be raised or lowered, or absorption may be affected.
Yes. Supplements and over-the-counter products can interact, not only prescription medicines. Mineral-containing products and some herbal preparations are particularly relevant.
Integrase inhibitors can bind to minerals such as calcium, magnesium, iron, and aluminium, which reduces how much medicine is absorbed. A doctor or pharmacist advises on separating these products appropriately.
Rifampicin, a core part of tuberculosis treatment, speeds up the processing of several antiretroviral medicines and lowers their levels. The treating doctor adjusts the plan so both conditions are managed effectively.
Some can, but others cannot. St John wort in particular can lower antiretroviral levels. Any herbal product should be discussed with the care team before it is taken.
Not necessarily. Many interactions are managed by adjusting the timing between products, and where that is not possible an alternative medicine can usually be selected.
A complete list of everything being taken, including prescription medicines, over-the-counter products, supplements, vitamins, and herbal preparations, along with anything started recently.
No. Interactions are well documented and are managed routinely in HIV care. This is why a full medication review is carried out before starting or changing any treatment.
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