Sodium Phenylbutyrate (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:

• Change in the frequency of breathing
• Lack of or irregular menstruation
• Lower back, side, or stomach pain
• Mood or mental changes
• Muscle pain or twitching
• Nausea or vomiting
• Nervousness or restlessness
• Swelling of the feet or lower legs
• Unpleasant taste
• Unusual tiredness or weakness

• Chills
• Fever
• Joint pain
• Sore throat
• Unusual bleeding or bruising

• Convulsions (seizures)
• Dizziness
• Dryness of the mouth
• Fast, slow, or irregular heartbeat
• Increased blood pressure
• Increased thirst
• Irritability
• Muscle cramps
• Rectal bleeding
• Swelling of the face
• Unusual weight gain
• Weak pulse

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:

• Changes in taste
• Decreased appetite
• Strong body odor

• Abdominal or stomach pain
• Constipation
• Fainting
• Headache
• Mental depression
• Skin rash

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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