Verywell Health's drug information is meant for education purposes only and not intended as a replacement for medical advice, diagnosis, or treatment from a healthcare professional. Consult your doctor before taking any new medication s.
IBM Watson Micromedex provides some of the drug content, as indicated on the page. Limiting processed foods and red meats can help ward off cancer risk.
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Table of Contents View All. Table of Contents. Side Effects. Similar Drugs. How to Stay Healthy. For oral dosage forms oral disintegrating tablets, solution, or tablets : For prevention of moderate nausea and vomiting after treatment with cancer medicines: Adults, teenagers, and children 12 years of age—At first, 8 milligrams mg taken 30 minutes before starting cancer treatment.
The 8-mg dose is taken again 8 hours after the first dose. Then, the dose is 8 mg every 12 hours for 1 to 2 days. Children 4 to 11 years of age—At first, 4 mg taken 30 minutes before starting cancer treatment. The 4-mg dose is taken again 4 and 8 hours after the first dose. Then, the dose is 4 mg every 8 hours for 1 to 2 days. Children younger than 4 years of age—Use and dose must be determined by your doctor.
For prevention of more severe nausea and vomiting after treatment with cancer medicines: Adults, teenagers, and children 12 years of age—One milligram mg tablet taken 30 minutes before starting cancer treatment. Children younger than 12 years of age—Use and dose must be determined by your doctor. For prevention of nausea and vomiting after radiation treatment: Adults—At first, 8 milligrams mg taken 1 to 2 hours before radiation treatment.
Then, the dose is 8 mg every 8 hours. Children—Use and dose must be determined by your doctor. For prevention of nausea and vomiting after surgery: Adults—24 milligrams mg or three 8-mg films taken 30 minutes before starting cancer treatment.
Each film should be dissolved in the tongue before taking the next film. For prevention of nausea and vomiting after radiation treatment: Adults—One 8-milligram mg film three times a day. For prevention of nausea and vomiting after surgery: Adults—16 milligrams mg or two 8-mg films taken 1 hour before anesthesia is given.
If someone collapses or isn't breathing after taking ondansetron, call immediately. Take this medication exactly as directed. Do not take more medication or take it more often than prescribed. Ask your doctor or pharmacist if you have questions.
Headache, lightheadedness, dizziness, drowsiness, tiredness, or constipation may occur. If these effects persist or worsen, notify your doctor promptly.
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
The risk increases if you are also taking other drugs that increase serotonin, so tell your doctor or pharmacist of all the drugs you take see Drug Interactions section. Get medical help right away if you develop some of the following symptoms:. A very serious allergic reaction to this drug is unlikely, but stop taking this medication and seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction include:. This is not a complete list of possible side effects.
If you notice other effects not listed above, contact your doctor or pharmacist. Call your doctor for medical advice about side effects. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at Before taking ondansetron, tell your doctor or pharmacist if you are allergic to it; or to other anti-nausea serotonin blockers e.
This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. Before using this medication, tell your doctor or pharmacist your medical history, especially of:. Ondansetron may cause a condition that affects the heart rhythm QT prolongation.
The risk of QT prolongation may be increased if you have certain medical conditions or are taking other drugs that may cause QT prolongation. Before using ondansetron, tell your doctor or pharmacist of all the drugs you take and if you have any of the following conditions:. Low levels of potassium or magnesium in the blood may also increase your risk of QT prolongation. Talk to your doctor about using ondansetron safely. This drug may make you dizzy or drowsy.
Alcohol or marijuana cannabis can make you more dizzy or drowsy. Do not drive, use machinery, or do anything that needs alertness until you can do it safely. Avoid alcoholic beverages. Talk to your doctor if you are using marijuana cannabis. Get emergency medical help if you have signs of an allergic reaction: rash, hives; fever, chills, difficult breathing; swelling of your face, lips, tongue, or throat.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. Ondansetron may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert. Use Ondansetron Zofran exactly as directed on the label, or as prescribed by your doctor.
Do not use in larger or smaller amounts or for longer than recommended. Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.
The first dose of ondansetron is usually taken before the start of your surgery, chemotherapy, or radiation treatment. Follow your doctor's dosing instructions very carefully. Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.
Store at room temperature away from moisture, heat, and light. Store liquid medicine in an upright position. Ondansetron orally disintegrating tablet can interact with other medications, vitamins, or herbs you may be taking. An interaction is when a substance changes the way a drug works. This can be harmful or prevent the drug from working well. To help avoid interactions, your doctor should manage all of your medications carefully. Do not take these drugs with ondansetron. Doing so can cause dangerous effects in your body.
Examples of these drugs include:. Taking ondansetron with certain medications raises your risk of side effects from ondansetron. This is because the amount of ondansetron in your body may be increased.
Taking these drugs with ondansetron can make ondansetron less effective. This is because the amount of ondansetron in your body may be decreased. However, because drugs interact differently in each person, we cannot guarantee that this information includes all possible interactions.
Always speak with your healthcare professional about possible interactions with all prescription drugs, vitamins, herbs and supplements, and over-the-counter drugs that you are taking.
Taking it again could be fatal cause death. For people with risk factors for heart arrhythmias: If you have conditions such as heart failure or congenital long QT syndrome, this drug may increase your risk of arrhythmias. Ask your doctor if you have risk factors for arrhythmias. For people with phenylketonuria: The ondansetron orally disintegrating tablet contains phenylalanine. This amino acid can cause dangerous effects in people with a condition called phenylketonuria.
Research in animals has not shown a risk to the fetus. However, animal studies do not always predict the way humans would respond. This drug should only be used in pregnancy if clearly needed. For women who are breastfeeding: Ondansetron may pass into breast milk and may cause side effects in a child who is breastfed. Talk to your doctor if you breastfeed your child. You may need to decide whether to stop breastfeeding or stop taking this medication.
For seniors: The kidneys of older adults may not work as well as they used to. This can cause your body to process drugs more slowly. As a result, a higher amount of a drug stays in your body for a longer time.
This raises your risk of side effects. For children: This medication has not been studied in children younger than 4 years. It should not be used in children of this age range. All possible dosages and drug forms may not be included here. Your dosage, drug form, and how often you take the drug will depend on:.
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