Chlorzoxazone (Oral Route)

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Side Effects

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur:

• Bloody or black, tarry stools
• Clay-colored stools
• Constipation
• Cough
• Dark urine
• Decreased appetite
• Difficulty swallowing
• Dizziness
• Fast heartbeat
• Fever
• Headache
• Hives
• Itching
• Large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
• Loss of appetite
• Nausea and vomiting
• Puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
• Severe stomach pain
• Shortness of breath
• Skin rash
• Swelling of the feet or lower legs
• Tightness in the chest
• Unusual tiredness or weakness
• Vomiting of blood or material that looks like coffee grounds
• Wheezing
• Yellow eyes or skin

Get emergency help immediately if any of the following symptoms of overdose occur:

• Diarrhea
• Difficult or troubled breathing
• Drowsiness
• General feeling of discomfort or illness
• Headache
• Irregular, fast or slow, or shallow breathing
• Lightheadedness
• Nausea
• Pale or blue lips, fingernails, or skin
• Sluggishness
• Vomiting

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

• Bruising
• Large, flat, blue, or purplish patches in the skin
• Small red or purple spots on the skin

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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