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PRECAUTIONS: Before taking ondansetron, tell your doctor or pharmacist if you are allergic to it; or to other 5-HT3 blockers (e.g., granisetron); or if you have any other allergies.Before using this medication, tell your doctor or pharmacist your medical history, especially of: liver disease, stomach/intestinal problems (e.g., recent abdominal surgery, ileus, swelling).This drug may make you dizzy or drowsy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Avoid alcoholic beverages.To minimize dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.This medicine may contain aspartame. If you have phenylketonuria (PKU) or any other condition that requires you to restrict your intake of aspartame (or phenylalanine), consult your doctor or pharmacist regarding the safe use of this medicine.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: Your healthcare professionals (e.g., doctor or pharmacist) may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop or change the dosage of any medicine before checking with them first.This drug should not be used with the following medication because a very serious interaction may occur: apomorphine.If you are currently using the medication listed above, tell your doctor or pharmacist before starting ondansetron.Before using this medication, tell your doctor of all nonprescription and prescription medication you may use, especially of: tramadol.Ask your doctor or pharmacist for more details.This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use. Keep a list of all your medications with you, and share the list with your doctor and pharmacist.

OVERDOSE: If overdose is suspected, contact your local poison control center or emergency room immediately. US residents can call the US national poison hotline at 1-800-222-1222. Canadian residents should call their local poison control center directly.

Report Problems to the Food and Drug Administration   You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088. Need help identifying pills and medications? Use the pill identifier tool on RxList.