Possible side effects of Tizanidine

Consumer Information (PDR)

Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe to continue using Zanaflex.

• More common side effects may include:
  Abnormal movements, blurred vision, constipation, dizziness, drowsiness, dry mouth, flu-like symptoms, frequent urination, low blood pressure, nervousness, runny nose, slow heartbeat, sore throat, speech disorders, urinary and other infections, vomiting, weakness or fatigue

Consumer Information (MedFacts)

All medicines may cause side effects, but many people have no, or minor, side effects. Check with your doctor if any of these most COMMON side effects persist or become bothersome:

Constipation; dizziness; drowsiness; dry mouth; flushing; tiredness; weakness.

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); change in emotions, mood, or behavior; hallucinations; increased muscle spasms; muscle weakness; slow heartbeat; trouble urinating or lack of bladder control; urinary tract infection; yellowing of the skin or eyes.

This is not a complete list of all side effects that may occur. If you have questions or need medical advice about side effects, contact your doctor or health care provider. You may report side effects to the FDA at 1-800-FDA-1088 (1-800-332-1088) or at http://www.fda.gov/medwatch.

Advanced Consumer Information (Micromedex)

• feeling light-headed, fainting, slow heart rate;

• hallucinations, confusion, unusual thoughts or behavior;

• nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes); or

• burning or pain when you urinate.

Less serious side effects may be more likely to occur, such as:

• drowsiness or dizziness;

• feeling anxious or nervous;

• numbness or tingling;

• stomach pain, diarrhea, constipation, vomiting;

• fever;

• dry mouth;

• muscle weakness, back pain;

• increased muscle tone or spasms; or

• sweating or skin rash.

This list is not complete and other side effects may occur. Tell your doctor about any unusual or bothersome side effects.

Consumer Information (Cerner Multum)

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.

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

Other 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. However, check with your doctor if any of the following side effects continue or are bothersome:

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