Get emergency medical help if you have signs of an allergic reaction to Zanaflex: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
a light-headed feeling, like you might pass out;
weak or shallow breathing;
confusion, hallucinations; or
yellowing of the eyes or skin.
pain or burning when you urinate.
Common Zanaflex side effects may include:
drowsiness, dizziness, weakness;
dry mouth;
feeling nervous;
blurred vision;
flu-like symptoms;
abnormal liver function tests;
runny nose, sore throat;
urination problems, painful urination;
vomiting, constipation; or
uncontrolled muscle movements.
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.
 Zanaflex side effects (more detail)
