Baclofen (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 as soon as possible if any of the following side effects occur:

• Bloody or dark urine
• Chest pain
• Fainting
• Hallucinations (seeing or hearing things that are not there)
• Mental depression or other mood changes
• Ringing or buzzing in the ears
• Skin rash or itching

• Blurred or double vision
• Convulsions (seizures)
• Muscle weakness (severe)
• Shortness of breath or unusually slow or troubled breathing
• 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:

• Confusion
• Dizziness or lightheadedness
• Drowsiness
• Nausea
• Unusual weakness, especially muscle weakness

• Abdominal or stomach pain or discomfort
• Clumsiness, unsteadiness, trembling, or other problems with muscle control
• Constipation
• Diarrhea
• Difficult or painful urination or decrease in amount of urine
• False sense of well-being
• Frequent urge to urinate or uncontrolled urination
• Headache
• Loss of appetite
• Low blood pressure
• Muscle or joint pain
• Numbness or tingling in hands or feet
• Pounding heartbeat
• Sexual problems in males
• Slurred speech or other speech problems
• Stuffy nose
• Swelling of ankles
• Trouble in sleeping
• Unexplained muscle stiffness
• Unusual excitement
• Unusual tiredness
• Weight gain

After you stop using this medicine, it may still produce some side effects that need attention. During this period of time, check with your doctor immediately if you notice the following side effects:

• Convulsions (seizures)
• Hallucinations (seeing or hearing things that are not there)
• Increase in muscle spasm, cramping, or tightness
• Mood or mental changes
• Unusual nervousness or restlessness

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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