Ondansetron
Ondansetron is a prescription anti-nausea medication in the 5-HT3 antagonist class. The pharmacy dispenses it as a 4mg tablet and as a 4mg or 8mg orally disintegrating tablet. It is prescribed as short-term alongside another treatment, after a licensed provider reviews your full medication list.
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About this treatment
Get support when nausea interrupts your day.
Ondansetron helps control nausea and vomiting by blocking a serotonin signal involved in the vomiting reflex. IAM lists a standard tablet and a tablet that dissolves on the tongue, with a review of the cause of nausea and your other medicines.
Block a signal involved in nausea
Ondansetron belongs to the serotonin 5-HT3 receptor antagonist class. It blocks a pathway that can trigger nausea and vomiting. Symptom relief can make an episode easier to manage, while your clinician still needs to understand why it is happening. Report when nausea began, its relationship to another treatment and whether you can keep fluids down.
Two tablet forms for different practical needs
A standard tablet is swallowed. An orally disintegrating tablet, or ODT, breaks apart on the tongue and is swallowed with saliva, which can be useful when taking a tablet with water is difficult. The ODT is still an oral medicine. Confirm the selected form and follow the pharmacy's packaging and handling instructions.
Keep the full treatment picture in view
Share all medicines, including antidepressants and drugs that affect heart rhythm. Mention a personal or family history of long QT syndrome, fainting, heart disease or low potassium or magnesium. Constipation and headache can occur. Seek prompt assessment for ongoing vomiting, worsening abdominal symptoms or inability to stay hydrated; fainting or an irregular heartbeat needs urgent medical attention.
Research and product information
Labeled uses focus on nausea and vomiting associated with chemotherapy, radiation and surgery. Use for symptoms caused by other medicines is off-label. Heart-rhythm risks, electrolyte problems and drug interactions require review, particularly when vomiting has led to dehydration.
- DailyMed: ondansetron orally disintegrating tablet prescribing information
- NIH MedlinePlus: ondansetron uses, tablet forms and safety information
Sources checked .
Your path to Ondansetron
Complete the assessment
Share which treatment you are starting and your nausea experience.
Provider review
A licensed provider decides whether ondansetron is appropriate and safe with your protocol.
Care coordination
Your care team coordinates the prescription after provider approval.
About this treatment
What it is
A 5-HT3 antagonist, dispensed here as a tablet or an orally disintegrating tablet. It is prescribed alongside another treatment rather than on its own.
Who it's for
Patients starting a treatment who tell their provider about nausea, and whose provider decides ondansetron is appropriate with their current prescriptions.
Forms we dispense
Tablet 4mg · ODT 4/
A licensed provider reviews your history and requests labs when clinically appropriate before prescribing.
Prescriptions are coordinated with our licensed US pharmacy partner, with dosing supplies included when needed.
We do not sell pharmaceuticals online. Every prescription comes after a full provider review.
