Ondem Syrup
30ml Syrup in BottleProduct Summary
Ondem Syrup is an antiemetic medicine used in children to prevent nausea and vomiting caused by chemotherapy, radiotherapy, and surgery. It contains ondansetron, which inhibits the action of serotonin, the chemical substance responsible for inducing nausea and vomiting, helping children feel more comfortable.
Medically Reviewed by Dr. Krisha R. Marolia
Last updated on: 13 October 2026 | 5:31 PM (IST)
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SYRUP
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General Information
| Therapy | Anti-emetic |
| Composition | Ondansetron(2.0 Mg/5Ml) Ondansetron 2.0 Mg/5Ml |
Ondansetron 2.0 Mg/5Ml

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*Offer applicable on orders above ₹1000About Ondem 2
Ondem syrup is used to manage nausea and vomiting in children. It contains ondansetron as an active ingredient. Ondem syrup works by inhibiting the action of a chemical substance known as serotonin, which is responsible for inducing nausea and vomiting.
This syrup should be given to your children as directed by a doctor under an adult's supervision. Shake the Ondem syrup well before each use.
Common side effects of Ondem Syrup may include headache, constipation, diarrhoea, and fatigue. These side effects usually disappear once your child's body adjusts to the medication. If these side effects persist or become difficult notify your doctor right away.
Inform your doctor about all of your child's medications, including painkillers and antimicrobial agents. Also, inform the doctor if your child has a history of liver problems, kidney failure, gastrointestinal tract blockage, heart issues, or allergies to any medicine, its ingredients, or food products.
A few other preparations that also contain ondansetron are Emigo suspension, Vomena Paed, Emeset syrup, and Zofer syrup.
Uses
Contraindications
- If your child is allergic to ondansetron or other ingredients of Ondem syrup.
- If your child is taking a medicine called apomorphine, which is used to treat loss of muscle control and muscle stiffness in Parkinson's disease.
Side effects
- Constipation
- Sensation of warmth
- Flushing
- Headache
- Hiccups
- Low blood pressure
- Fits
Precautions and Warnings
Other General Warnings
- Your child is allergic to similar medicines like granisetron or palonosetron.
- Your child has severe constipation or has a blockage in the stomach as the medicine can affect the food transit time through the digestive tract.
- Your child has heart problems like heart failure or irregular heartbeats.
- Your child has liver problems or a condition of salt imbalance in blood or dehydration or your child is experiencing fluid loss.
Doctor’s suggestion

Directions for use
- Do not consume Ondem directly from the bottle.
- Use a proper measuring cup or spoon for the exact quantity.
- Shake well before use and read the instructions on the bottle before use.
Storage and disposal
- Store Ondem syrup at room temperature, away from light and moisture.
- Keep the medicine away from children and pets.
- Do not flush unused or expired medicines in the toilet or pour them into the drain.
Quick tips
- Follow the doctor's instructions carefully regarding the dosage and duration of Ondem Syrup administration.
- Inform the doctor about any other medicines your child is taking.
- Do not start any new medication without consulting your doctor first.
- Give your child plenty of fluids, such as water, clear soups, or oral rehydration solutions.
- Avoid greasy, spicy, or heavy foods when your child is unwell.
- Offer small meals and encourage your child to eat slowly.
- Allow your child to rest and avoid excessive physical activity.
- Monitor for signs of dehydration, such as dry mouth, tiredness, or reduced urine output.
- Maintain a calm and comforting environment to help your child recover.
- If vomiting persists or worsens, contact the doctor immediately.
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Frequently asked questions
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References
- Ondansetron 4mg/5ml Syrup - Summary of Product Characteristics (SmPC) - (emc) [Internet]. Medicines.org.uk. 2022 [cited 4 May 2022]
- CDSCO [Internet]. Cdscoonline.gov.in. 2022 [cited 4 May 2022]
- Ondansetron 4 mg film-coated tablets - Summary of Product Characteristics (SmPC) - (emc) [Internet]. Medicines.org.uk. 2024 [cited 18 December 2024]
- Ondansetron 4 mg film-coated tablets - Patient Information Leaflet (PIL) - (emc) [Internet]. Medicines.org.uk. 2024 [cited 18 December 2024]
- MedlinePlus. Ondansetron: MedlinePlus Drug Information [Internet]. Bethesda (MD): National Library of Medicine (US); [cited 18 December 2024 ].
- Griddine A, Bush JS. Ondansetron. [Updated 2023 Feb 15]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2024 Jan-
- National Cancer Institute. Ondansetron Hydrochloride [Internet]. Cancer.gov. [cited 18 May 2026 ].
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