What side effects may I notice from receiving Chlorzoxazone?

Side effects that you should report to your doctor or health care professional as soon as possible:

-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-breathing problems
-signs and symptoms of liver injury like dark yellow or brown urine; general ill feeling or flu-like symptoms; light-colored stools; loss of appetite; nausea; right upper belly pain; unusually weak or tired; yellowing of the eyes or skin
-uncontrollable head, mouth, neck, arm, or leg movements
-unusual bleeding or bruising
-unusually weak or tired
-vomiting

Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-dizziness
-drowsiness
-headache
-nausea
-orange or purple-red color of the urine
-stomach upset
-tiredness

This list may not describe all possible side effects for Chlorzoxazone. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.