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Onan Syrup is a medicine given to children to help treat nausea and vomiting. It is mainly given to treat nausea and vomiting associated with surgery, chemotherapy, radiotherapy, and stomach/intestinal infection. It also helps treat vomiting that is caused as a side effect of medicines like painkillers.

Written By Dr. Swati Mishra, BDS,
Reviewed By Dr. Sachin Gupta, MD Pharmacology, MBBS,
Last updated on 29 Apr 2026 | 01:02 PM (IST)
₹21.1 MRP ₹23.3510% off 
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General Information

The content is shown in English
Onan Syrup image
Onan Syrup image

Product introduction

Onan Syrup may be given before or after meals. To control vomiting caused due to chemotherapy, give this medicine to your child 30 minutes before the procedure. Give it 1 to 2 hours before a radiotherapy session and 1 hour before surgery to prevent your child from vomiting post these procedures. If your child expels out the medicine within 30 minutes of the intake, help your child calm down and repeat the dose. Do not double the dose if it is already time for the next dose.

Onan Syrup may cause some temporary side effects such as headache, constipation, diarrhea, and fatigue. These side effects usually subside once your child’s body adapts to the medicine. In case these side effects persist or become bothersome, do reach out to the doctor on a priority basis.

Let the doctor know about all the medicines your child is taking, including painkillers, antibiotics, or medicines taken to treat depression. Also, inform the doctor if your child has a history of liver problems, kidney malfunction, blockage in the gastrointestinal tract, heart problems, or allergies to any medicine, its ingredients, or a food product. This information is very important for dose alterations and for planning your child’s overall treatment.

Uses of Onan Syrup

Benefits of Onan Syrup

Vomiting
Vomiting is the forceful expulsion of stomach contents, which can occur due to infections, surgery, or treatments like chemotherapy. Onan Syrup helps control this by preventing the signals that trigger vomiting. This provides relief and allows patients to stay comfortable and maintain proper nutrition.
Nausea
Nausea is the uneasy sensation that often comes before vomiting and can make daily activities difficult. Onan Syrup reduces this sensation by blocking the pathways in the body that cause nausea. This helps patients feel more at ease and improves their overall quality of life during treatment.

Side effects of Onan Syrup

Most side effects do not require any medical attention and disappear as your body adjusts to the medicine. Consult your doctor if they persist or if you’re worried about them
Common side effects of Onan
  • Fatigue
  • Headache
  • Constipation
  • Diarrhea

How to use Onan Syrup

Take this medicine in the dose and duration as advised by your doctor. Check the label for directions before use. Measure it with a measuring cup and take it by mouth. Shake well before use. Onan Syrup may be taken with or without food.

How Onan Syrup works

During radiotherapy, chemotherapy, abdominal infection, or any major surgeries, the dead cells in the body start releasing a chemical called serotonin directly into the blood. Later, this stimulates special centers in the body that are responsible for inducing vomiting in your child. Giving Onan Syrup just before the procedure helps block the effect of this chemical on vomiting centers of the brain and prevents vomiting.

Quick tips

  • Onan Syrup effectively controls nausea and bouts of vomiting reflex in children undergoing chemotherapy or radiotherapy sessions.
  • It is fast-acting and starts working within 30 minutes.
  • Practice self-care measures:
    1. Give plenty of fluids to your child to avoid dehydration
    2. Avoid giving fried and spicy food or heavy meals to your child. 
    3. Ensure that your child eats slowly and in small proportions.

Safety advice

Alcohol

Alcohol

CONSULT YOUR DOCTOR
It is not known whether it is safe to consume alcohol with Onan Syrup. Please consult your doctor.
Pregnancy

Pregnancy

CONSULT YOUR DOCTOR
Onan Syrup is not recommended during pregnancy as there is positive evidence of fetal risk based on animal studies. However, it may still be prescribed by a doctor in situations where the benefits outweigh the risks.
Breast feeding

Breast feeding

CAUTION
Onan Syrup should be used with caution during breastfeeding. Breastfeeding should be held until the treatment of the mother is completed and the drug is eliminated from the body.
Driving

Driving

SAFE
Onan Syrup does not usually affect your ability to drive.
Kidney

Kidney

CAUTION
Onan Syrup should be used with caution in patients with severe kidney disease. Dose adjustment may be needed.
Liver

Liver

CAUTION
Onan Syrup should be used with caution in patients with liver disease. Dose adjustment may be needed.

Interaction with drugs

Taking Onan with any of the following medicines can modify the effect of either of them and cause some undesirable side effects
Life-threatening

Hydroxyzine (Oral Route)

Do not consume Hydroxyzine with Ondansetron.
Life-threatening

Voriconazole (Oral Route)

Do not consume Voriconazole with Ondansetron.
Life-threatening

Fluconazole (Oral Route)

Do not consume Fluconazole with Ondansetron.
Life-threatening

Domperidone (Oral Route)

Do not consume Domperidone with Ondansetron.
Life-threatening

Efavirenz (Oral Route)

Do not consume Efavirenz with Ondansetron.

Frequently asked questions

Onan Syrup is unlikely to cause harm if you give an extra dose by mistake. However, you must still speak to your child’s doctor immediately. Sometimes, excessive intake of Onan Syrup can cause some serious side effects like excess sleepiness, agitation, rapid heartbeat, hypertension, flushing, dilated pupils, sweating, involuntary muscle jerk, uncontrolled eye movements, overactive reflexes, and seizures. These symptoms are collectively known as serotonin syndrome. If any of these appear, consult the doctor without any delay.
Onan Syrup should be stored at room temperature, in a dry place, away from direct heat and light. Also, keep all the medicines out of the reach and sight of children to avoid any accidental intake.
Usually, it is advised not to give Onan Syrup along with antidepressant medicines, apomorphine, anti-migraine medicines, painkillers, heart medicines, and antibiotics like linezolid. But, it is ideal to speak to your child’s doctor before coming to any conclusion. So, narrate your child’s complete medical history to your child’s doctor and follow their advice strictly.
Call your child’s doctor immediately if your child develops symptoms of serotonin syndrome like irregular heartbeat, green-colored vomiting, inability to pass wind, pale skin and eyes, dark-colored urine, restlessness, and insomnia.
Avoid combining Onan Syrup with such medicines because concomitant use of Onan Syrup with medicines meant to treat depression or migraine results in serotonin syndrome. Consult your child’s doctor before giving any medicine to your child.

Fact Box

Chemical Class

Carbazoles

Habit Forming

No

Therapeutic Class

GASTRO INTESTINAL

Action Class

Serotonin 5-HT3 Receptor Antagonists
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Disclaimer

Tata 1mg's sole intention is to ensure that its consumers get information that is expert-reviewed, accurate and trustworthy. However, the information contained herein should NOT be used as a substitute for the advice of a qualified physician. The information provided here is for informational purposes only. This may not cover everything about particular health conditions, lab tests, medicines, all possible side effects, drug interactions, warnings, alerts, etc. Please consult your doctor and discuss all your queries related to any disease or medicine. We intend to support, not replace, the doctor-patient relationship.

Marketer details

Name: Cure Quick Pharmaceuticals
Address: Sector 3, Karnal, Haryana 132001

Vendor Details

Country of origin: India
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