Ondansetron: dissolving tablets and heart-rhythm precautions
This guide is here to teach you. It is not medical advice, and it does not replace your doctor or pharmacist. Always do what your doctor tells you, and ask a pharmacist before you change how you take any medicine.
Print or save this guideQuick answers
How do I take an ODT?
With dry hands, peel back the blister foil instead of pushing through it. Put the tablet on your tongue immediately and let it dissolve; swallow with saliva.
Can I take another if nausea continues?
Follow the prescribed interval and maximum. Contact your clinician if treatment is not working instead of adding doses.
Why ask about my heart medicines?
Ondansetron can affect heart rhythm. Low potassium/magnesium, rhythm disorders and other medicines can increase risk.
Sources: MedlinePlus; ondansetron ODT labeling.
What if I miss a scheduled dose?
Take it when remembered unless the next dose is nearly due; then skip it. Never double. If prescribed only as needed, follow that plan rather than creating a catch-up schedule. MedlinePlus
What should I tell the pharmacist?
Mention congenital long-QT syndrome, fainting, heart failure, liver disease and all medicines. Ondansetron must not be combined with apomorphine. An ECG or electrolyte checks may be needed for people at risk. Tell us about PKU because some ODT products contain phenylalanine. Ondansetron ODT labeling
Which symptoms need help?
Headache and constipation can occur. Seek urgent care for fainting, chest pain or an abnormal heartbeat. Fever with confusion and muscle stiffness/twitching can signal serotonin syndrome. Severe breathing trouble or throat swelling requires emergency help. Report abdominal swelling or inability to pass stool/gas, especially after surgery. Ondansetron ODT labeling
Get help with your prescription
Ask a Fairview pharmacist to check your nausea medicine and other prescriptions. Prescription services are through the pharmacy, not the OTC shop. This is general education.