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.
Call your doctor at once if you have:
severe constipation, stomach pain, or bloating;
headache with chest pain and severe dizziness, fainting, fast or pounding heartbeats;
fast or pounding heartbeats;
jaundice (yellowing of the skin or eyes);
blurred vision or temporary vision loss (lasting from only a few minutes to several hours);
high levels of serotonin in the body--agitation, hallucinations, fever, fast heart rate, overactive reflexes, nausea, vomiting, diarrhea, loss of coordination, fainting.
Common side effects may include:
diarrhea or constipation;
headache;
drowsiness; or
tired feeling.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Zofran ODT side effects (more detail)
