Ondansetron
System: AllopathyClass: Antiemetic (5 HT3 Blocker)Composition: OndansetronPrescription: Prescription OnlyEssential medicine (NLEM): Yes
Ondansetron prevents and treats nausea and vomiting.
Common brands
- Emeset
- Ondem
- Vomikind
Dosage forms
- Tablet
- Mouth-dissolving tablet
- Syrup
- Injection
Uses
- Vomiting in gastroenteritis
- Chemotherapy-related nausea
- Post-operative nausea
How it works
Blocks serotonin signals that trigger vomiting.
How to take
Mouth-dissolving tablet on the tongue; follow prescribed dose.
Common side effects
- Headache
- Constipation
Serious side effects — get medical help
- Heart rhythm problems (QT prolongation)
- Serotonin syndrome with other drugs
Who should not take it
- Congenital long QT
Interactions
- Other QT-prolonging drugs
- Antidepressants (serotonin)
Pregnancy & breastfeeding
Use only if prescribed in pregnancy.
Alcohol & driving
No specific restriction.
Storage
Store below 30°C.
Used for these conditions
Prescribed by
Brands available in India
Frequently asked questions
What is Ondansetron used for?
Vomiting in gastroenteritis, Chemotherapy-related nausea, Post-operative nausea
What are the side effects of Ondansetron?
Headache, Constipation
How should I take Ondansetron?
Mouth-dissolving tablet on the tongue; follow prescribed dose.
Who should not take Ondansetron?
Congenital long QT
Medically reviewed by
Medical review pending
Last updated
9 October 2026
Sources
- National List of Essential Medicines (NLEM) 2022, MoHFW
- National Formulary of India, Indian Pharmacopoeia Commission
- CDSCO approved drug information
This information is for general awareness and does not replace advice from a qualified doctor. Do not start, stop or change any medicine without medical advice.