Nausea after medicine – what to check first
What to do when a medicine makes you feel nauseated, which label details matter and when nausea needs urgent medical assessment.
Nausea can be a side effect, interaction or separate illness
Feeling sick after taking a medicine does not prove the medicine is the cause, but the timing is worth recording. Nausea can also come from an infection, pregnancy, migraine, dehydration or another condition. A pharmacist can check the exact product, dose, food instructions and other medicines before you stop or add anything.
The details a pharmacist needs
- The exact ingredient, strength and time taken.
- Whether it was taken with food, water or another product.
- When nausea started and whether there is vomiting, pain, fever or diarrhoea.
- Every prescription, pharmacy, traditional and complementary medicine.
Do not double the next dose, crush a tablet or switch to an anti-nausea medicine without checking the instructions for the product involved.
Until you have advice
- Take small sips of fluid if you can keep them down.
- Keep the medicine packaging and write down the timing.
- Contact a pharmacist or prescriber before changing essential treatment.
- Ask what warning signs should bring you back or send you to urgent care.
Some medicine reactions are emergencies
Common questions
- What should I do if medicine makes me nauseous?
- Record the timing and exact product, then ask a pharmacist or prescriber whether it should be taken with food, changed or reviewed. Do not stop essential treatment without advice.
- Can I take an anti-nausea medicine with my other medicine?
- Check first. Anti-nausea medicines can interact with other treatment and may be unsuitable in pregnancy, childhood or certain health conditions.
Sources
- Adult Primary Care guide: symptom-based integrated approach to the adult in primary careNational Department of Health, South Africa
- Primary Healthcare Standard Treatment Guidelines and Essential Medicines ListNational Department of Health, South Africa
- Medicines Online Directory and approved patient information leafletsSouth African Health Products Regulatory Authority
Last reviewed 26 August 2026.