Anti-infective
Antiretrovirals
Antiretroviral therapy (ART) for HIV — Combination drugs that suppress HIV so the virus becomes undetectable and untransmittable — taken lifelong and managed by specialists.
Education and reference only. This is a plain-language class overview — it deliberately contains no doses. Always check the current Summary of Product Characteristics (SmPC), the BNF and your local formulary before prescribing or administering any medicine.
Quick answer
What is Antiretrovirals?
Antiretrovirals are the medicines used to treat HIV. Modern treatment combines several drugs — now often in a single daily tablet — to suppress the virus so effectively that it becomes undetectable on blood tests.
- How it works: HIV copies itself by hijacking human cells, and antiretrovirals block different steps of that life cycle.
- In practice: In practice, ART is initiated and supervised by HIV specialists, with regimens chosen for the individual and increasingly built around an integrase inhibitor in a single tablet for simplicity and adherence.
What it is
Antiretrovirals are the medicines used to treat HIV. Modern treatment combines several drugs — now often in a single daily tablet — to suppress the virus so effectively that it becomes undetectable on blood tests. When the virus is undetectable it cannot be passed on through sex, a principle known as U=U (undetectable equals untransmittable). Treatment is lifelong, and the same drugs are also used to prevent HIV in people at risk, either before exposure (PrEP) or shortly after a possible exposure (PEP).
How it works
HIV copies itself by hijacking human cells, and antiretrovirals block different steps of that life cycle. The main groups are nucleoside/nucleotide reverse-transcriptase inhibitors (NRTIs, such as tenofovir, emtricitabine and abacavir), non-nucleoside reverse-transcriptase inhibitors (NNRTIs, such as efavirenz and rilpivirine), protease inhibitors (such as darunavir, often given with a low-dose booster), and integrase inhibitors (such as dolutegravir and bictegravir). Combining drugs that attack different stages stops the virus replicating and makes it far harder for resistance to develop.
In practice
In practice, ART is initiated and supervised by HIV specialists, with regimens chosen for the individual and increasingly built around an integrase inhibitor in a single tablet for simplicity and adherence. Before starting abacavir, test for HLA-B*5701, as a positive result predicts a dangerous hypersensitivity reaction. Boosted regimens using ritonavir (or cobicistat) are powerful but cause extensive drug interactions, so every new medicine — including over-the-counter products and supplements such as St John's Wort — must be checked. Adherence is everything: missed doses risk viral rebound and resistance, so any barriers to taking the tablets are addressed actively.
Examples
Practical use
How to take it & use it well
- Take your HIV medicines every single day, at the times you have been told, even when you feel completely well, as keeping the level steady is what keeps the virus suppressed and protects your health.
- Try to link your doses to a daily routine, such as a meal or brushing your teeth, and use a phone alarm or pill organiser, since missing doses lets the virus rebound and can lead to resistance.
- Follow the food advice for your particular combination, as some are best taken with food and others on an empty stomach, and never stop or change them on your own without speaking to your HIV team.
- Keep a few spare days of tablets with you when travelling and order repeats in good time, so you never run out, as gaps in treatment are the main thing that lets the virus come back.
- Tell any pharmacist, GP or dentist that you take HIV medicines before starting anything new, including remedies bought over the counter, as many ordinary medicines can clash with your treatment.
- Go to your regular blood tests and clinic appointments, as these confirm the virus is staying undetectable and check that your kidneys, liver and bones are not being affected.
Common uses
- Treatment of HIV infection
- Pre-exposure prophylaxis (PrEP)
- Post-exposure prophylaxis (PEP)
- Preventing mother-to-child transmission
Monitoring
- HIV viral load and CD4 count
- Kidney and liver function and (for some agents) bone health
- HLA-B*5701 before abacavir and review of all co-medications for interactions
Weighing it up
Advantages & disadvantages
Advantages
- Taken faithfully, they keep HIV under control so that people can live long, healthy lives much like anyone else.
- When the virus is kept undetectable, it cannot be passed on through sex, which is known as undetectable equals untransmittable, or U equals U.
- Many modern options combine several medicines into a single daily tablet, making treatment far simpler than in the past.
- They protect the immune system, greatly lowering the risk of serious infections and HIV-related illness.
- They allow people with HIV to plan families and have children without passing the virus on, with the right care.
Disadvantages
- They are not a cure and must be taken every day for life, as the virus rebounds if treatment stops.
- Missing doses can let the virus become resistant, which can make a whole combination stop working.
- Some people get side effects, especially early on, such as nausea, headache, sleep changes or vivid dreams.
- Certain ones can affect the kidneys, liver, bones or blood fats over time, which is why monitoring is needed.
- They interact with many other medicines, so every new treatment has to be checked carefully first.
Key safety principles
What to watch for
- Test for HLA-B*5701 before abacavir to avoid a serious hypersensitivity reaction.
- Boosted regimens (e.g. with ritonavir) interact with many drugs — always check before adding anything, including herbal products.
- Adherence is critical; missed doses risk viral rebound and drug resistance.
- Some agents need adjustment in kidney or liver impairment and in pregnancy — specialist-managed.
- Never stop or switch therapy without specialist advice.
Key interactions
What to avoid or check alongside
- Indigestion remedies, antacids and supplements containing calcium, magnesium, iron or zinc can stop some HIV tablets being absorbed, so they must be spaced well apart.
- Some cholesterol-lowering statins can build up to harmful levels with certain HIV medicines, so the choice and amount may need changing.
- Several HIV medicines can make the contraceptive pill or implant less reliable, so a back-up method or specialist advice is often needed.
- Medicines for tuberculosis, epilepsy and some herbal products such as St John's wort can lower the level of HIV treatment and let the virus rebound.
- Recreational drugs, including some used on the club scene, can reach dangerous levels with certain HIV medicines, so always be honest with your team.
Patient & carer advice
- Take every dose as prescribed — keeping the virus suppressed protects you and means you cannot pass it on (U=U)
- Tell every healthcare professional and pharmacist you take HIV medication so interactions can be checked
- Do not start any new medicine, supplement or St John's Wort without checking first
- Keep your specialist appointments and blood tests
Answers
Antiretrovirals: frequently asked questions
What does undetectable equals untransmittable mean?
It means that when your HIV medicines keep the virus at an undetectable level in your blood, you cannot pass HIV on to a sexual partner. This is often shortened to U equals U and is backed by strong evidence. Staying on treatment every day is what keeps you undetectable.
What happens if I miss a dose of my HIV medicine?
An occasional missed dose is not a disaster, but repeated missed doses let the virus rebound and can lead to resistance, which may stop your combination working. Take it as soon as you remember unless it is nearly time for the next, and never double up. If you miss doses often, tell your HIV team so they can help.
Can I ever stop taking antiretrovirals once I'm undetectable?
No. Being undetectable shows the treatment is working, not that the virus has gone, and stopping lets it rebound within weeks. HIV medicines are taken for life, so never stop without your specialist team, even if you feel completely well.
Will my HIV medicines interact with other tablets?
They can, which is why it is so important to tell every pharmacist, GP and dentist that you take them. Common culprits include indigestion remedies, some statins, certain contraceptives and herbal products. Always have new medicines checked against your combination before starting them.
Are HIV medicines a cure?
No, they are not a cure, but they are a highly effective lifelong treatment that keeps the virus suppressed and the immune system healthy. Taken every day, they allow people with HIV to live a normal life span and prevent passing the virus on.
Authoritative sources
Always verify against the source
This overview is for orientation. For doses, interactions, contra-indications and the full monograph, use:
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