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.
Feeling sick or actually vomiting after taking your HIV medication is a common concern, especially in the first few weeks of treatment. Most nausea is mild and settles on its own. But if you vomit shortly after taking a dose, you may worry about whether the drugs have been absorbed.
Here’s practical guidance on what to do.
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If You Vomit After Taking Your Medication
| When You Vomited | What to Do |
|---|---|
| Within 1 hour of taking the dose | Take another dose as soon as you can keep it down |
| More than 1 hour after taking the dose | Do not take another dose — the drug has likely been absorbed |
| You keep vomiting and can’t keep anything down | Contact your HIV clinic for advice |
Tips for Managing Nausea
- Take medication with food (unless your specific drug says otherwise)
- Eat smaller, more frequent meals
- Avoid strong smells, spicy or greasy food
- Try ginger tea or ginger biscuits
- Take your dose at bedtime so you sleep through the worst of any nausea
- Stay upright for 30 minutes after taking your tablet
When Nausea Is Normal vs Concerning
Normal (usually settles)
- Mild nausea in the first 2-4 weeks of starting or switching treatment
- Slight queasiness around the time you take your dose
- Getting better over time
Contact your clinic if
- Nausea is severe or persistent beyond 4 weeks
- You can’t keep food or fluids down for more than 24 hours
- You have abdominal pain, dark urine or yellowing of the skin
- You develop a rash alongside nausea
- You’re losing weight because you can’t eat
Could It Be Your Medication?
Some HIV drugs are more likely to cause nausea than others. If nausea is persistent and affecting your quality of life, your HIV team can consider switching to a different regimen. Never stop or change your medication without speaking to your team first.
Diarrhoea After Taking Meds
Diarrhoea within an hour of taking your dose raises similar absorption concerns. If it’s a one-off, no action is needed. Persistent diarrhoea should be discussed with your clinic — protease inhibitors are a common cause, and alternatives may suit you better.
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Frequently Asked Questions
Should I take a double dose if I vomited?
Only if you vomited within an hour and can see the tablet. Otherwise, take your next dose as scheduled. Never take a double dose unless advised by your HIV team.
Will nausea go away?
Usually, yes. Most medication nausea settles within 2-4 weeks. If it doesn’t, talk to your clinic — there may be a better-tolerated option.
Can I take anti-sickness tablets with my HIV meds?
Some anti-emetics are safe with ART. Check with your HIV pharmacist before taking anything over the counter.
Related reading
- Blood Test for Syphilis, Hepatitis B and Hepatitis C
- Can You Get an STI From Being Fingered?
- Can You Catch an STI From a Toilet Seat?
- Can You Clear HPV Once You Have It?
- Can You Die From Hepatitis B?
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.
