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Author: Admin | 2025-04-28
If you continue taking ondansetron more frequently than this you are at higher risk of side effects such as constipation, headache, or heart effects.How long does ondansetron take to work? Oral ondansetron works quickly, usually within 30 minutes, but it can take up to two hours for the full effect. It’s taken before you receive medicines or procedures that might make you feel nauseous or cause vomiting. Oral doses are usually taken 30 minutes before chemotherapy, 1 hour before surgery, or 1 to 2 hours before radiation treatments. You may need extra doses. Your doctor will tell you exactly when to take your medication.Does ondansetron make you sleepy? Yes, ondansetron (Zofran) might make you feel sleepy or tired. Ondansetron injection for the treatment of post-operative nausea and vomiting has been reported to cause drowsiness or sedation in 8% of patients vs. 7% of those using a placebo (an inactive treatment). Malaise (generally feeling unwell) and fatigue (tiredness or lack of energy) have also been reported in 13% of patients (vs. 2% placebo) when it is used orally for the prevention of chemotherapy-induced nausea and vomiting.Further informationRemember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medicine only for the indication prescribed.Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.Medical DisclaimerCopyright 1996-2025 Cerner Multum, Inc. Version: 15.01.
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