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Important Note

The following information is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. Consult your healthcare professional before using this drug.





This medication is used to prevent nausea and vomiting caused by cancer drug treatment (chemotherapy). It works by blocking one of the body's natural substances (serotonin) that causes vomiting.

How To Use

Ondansetron is given by injection into a vein (IV) over 15 minutes by a health care professional, usually 30 minutes before cancer chemotherapy treatment; or as directed by your doctor. Do not exceed the recommended infusion rate. Giving the medication faster than recommended may increase the chance of serious side effects such as fainting or slowed/irregular heartbeat. Before using, check this product visually for particles or discoloration. If either is present, do not use the liquid.

Side Effects

Headache, fever, blurred vision, lightheadedness, dizziness or redness/pain/burning at the injection site may occur. If any of these effects persist or worsen, notify your doctor or pharmacist promptly. An allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include: rash, itching, swelling, severe dizziness, trouble breathing. If you notice other effects not listed above, contact your doctor or pharmacist.


Before using this medication, tell your doctor or pharmacist your medical history, especially of: severe liver disease, stomach/intestinal problems (e.g., ileus, gastric distention), any allergies. This drug may make you dizzy or cause blurred vision; use caution engaging in activities requiring alertness such as driving or using machinery. Limit alcoholic beverages. This medication should be used only when clearly needed during pregnancy. Discuss the risks and benefits with your doctor. It is not known whether this drug passes into breast milk. Consult your doctor before breast-feeding.

Drug Interactions

Before using this medication, tell your doctor or pharmacist of all prescription and nonprescription products you may use. Do not start or stop any medicine without doctor or pharmacist approval.


If overdose is suspected, contact your local poison control center or emergency room immediately. Symptoms of overdose may include: severe dizziness or slowed/irregular heartbeat.


This medication is only to prevent nausea and vomiting associated with cancer chemotherapy. It is not to be used for nausea and vomiting due to other causes.

Missed Dose

It is important that the dose be given prior to cancer chemotherapy as directed. If you miss a dose, contact your doctor or pharmacist to establish a new dose schedule.


Store between 36 and 86 degrees F (2-30 degrees C) away from light and moisture. Do not freeze. Do not store in the bathroom. Keep all medicines away from children and pets.