About Ondansetron
Medically reviewed by Dr Khizer Hussain Junaidy, MD Pharmacology, Diabetologist & Bariatric Physician, on 23 Oct 2026.
What it is for
Prevents and treats nausea and vomiting, including from stomach infections and after surgery.
How to take it
Mouth-dissolving tablets are placed on the tongue. Take as advised, usually every 8 to 12 hours.
Common side effects
- Headache, constipation.
Call your doctor if
- Fast or uneven heartbeat.
- Vomiting with severe belly pain or blood.
Take care
Tell the doctor about heart rhythm problems.
From our clinic: Sip ORS slowly after vomiting settles to avoid dehydration.