References UK clinical guidance from the NHS, the British HIV Association (BHIVA), and the British Association for Sexual Health and HIV (BASHH). Last updated: April 2026.
Starting HIV treatment is one of the most important decisions you’ll make after an HIV diagnosis. Modern antiretroviral therapy (ART) is highly effective, well-tolerated, and can reduce HIV to undetectable levels within a few months. Most people feel completely well on treatment and go on to have a normal lifespan.
Here’s what to expect in the first weeks and months of starting HIV treatment in the UK.
When Should You Start HIV Treatment?
Current BHIVA guidance is clear: everyone diagnosed with HIV should start treatment as soon as possible, regardless of CD4 count. Earlier treatment gives better long-term outcomes, reduces the risk of AIDS-related complications, and makes you non-infectious to sexual partners once the virus is suppressed (U=U — Undetectable = Untransmittable).
In the UK, treatment is free on the NHS and available through specialist HIV clinics. Your HIV specialist will discuss options and help you choose a regimen.
Typical First-Line Regimen
For most newly diagnosed adults, a single-tablet once-daily regimen is recommended:
- Biktarvy (bictegravir + emtricitabine + TAF) — one tablet daily
- Triumeq (dolutegravir + abacavir + lamivudine) — one tablet daily, only after HLA-B*5701 testing
- Dovato (dolutegravir + lamivudine) — a two-drug regimen, one tablet daily
What to Expect in the First Weeks
| Timeframe | What’s Happening |
|---|---|
| Week 1-2 | Drug reaches steady levels. You may notice mild side effects (nausea, headache, fatigue). Most settle within a few days. |
| Week 4 | First follow-up blood tests. Viral load may already be dropping significantly. |
| Month 2-3 | Viral load typically drops to very low levels. CD4 count starts to recover. |
| Month 3-6 | Viral load usually becomes undetectable (<50 copies/ml). You are now non-infectious (U=U). |
| Month 6+ | Routine monitoring every 3-6 months. CD4 count continues to recover over 1-2 years. |
Common Side Effects
- Nausea (usually settles in 1-2 weeks)
- Headache
- Fatigue
- Diarrhoea
- Sleep disturbance (more common with some drugs like dolutegravir taken at night)
- Vivid dreams (mainly with efavirenz, which is less commonly used now)
Most side effects improve significantly after the first 2-4 weeks. If they don’t, your doctor may switch you to a different drug.
Monitoring During Treatment
- Month 1: Viral load, CD4 count, liver/kidney function, blood counts
- Month 3: Viral load check to confirm suppression is on track
- Month 6: Full blood work, confirmation of undetectable viral load
- Ongoing: Every 3-6 months for routine monitoring
Read more: What is HIV? | ART side effects | CD4 counts explained
Frequently Asked Questions
How long before I feel normal on HIV treatment?
Most people feel completely normal within 2-4 weeks of starting treatment. Initial side effects usually settle quickly. If you still feel unwell after a month, discuss with your HIV clinic — a different drug may suit you better.
Will HIV treatment affect my other medications?
Some HIV drugs interact with other medications. Always tell your HIV specialist about everything you take, including over-the-counter drugs, supplements, and recreational substances. Modern integrase inhibitor regimens have relatively few interactions.
Can I stop treatment if I feel better?
No. HIV treatment is lifelong. Stopping causes the virus to rebound within days, your CD4 count will fall, and you risk developing drug resistance. Always discuss any changes with your HIV specialist.
Related reading
- Injectable HIV Treatment: Everything You Need to Know
- Are HIV Tests Accurate If You're on PrEP, PEP or ART?
- CD4/CD8 Ratio: What It Means and Why It Matters
- CD4 Counts Explained: What Your Numbers Mean
- Changing HIV Treatment: When, Why and How
Sources
- NHS — Sexual health conditions
- BASHH — UK clinical guidelines for STI management
- British HIV Association (BHIVA) — HIV treatment guidelines
- Terrence Higgins Trust — sexual health information
- UK Health Security Agency — STI surveillance data
Steve Page is a recognised expert on Sexually Transmitted Diseases (STDs) and STD treatments, having published numerous articles in peer-reviewed journals and presented his research at conferences around the world. He has an in-depth understanding of the latest medical research on STDs, and is an advocate for the development of new treatments and protocols to improve the health of those affected. In addition to his research, he has dedicated his career to understanding the causes and symptoms of STDs, as well as how to best treat those impacted.
