Naltrexone (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:

• Skin rash

• Abdominal or stomach pain (severe)
• Blurred vision, aching, burning, or swollen eyes
• Chest pain
• Confusion
• Discomfort while urinating and/or frequent urination
• Fever
• Hallucinations or seeing, hearing, or feeling things that are not there
• Itching
• Mental depression or other mood or mental changes
• Ringing or buzzing in the ears
• Shortness of breath
• Swelling of the face, feet, or lower legs
• Weight gain

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:

• Abdominal or stomach cramping or pain (mild or moderate)
• Anxiety, nervousness, restlessness and/or trouble in sleeping
• Headache
• Joint or muscle pain
• Nausea or vomiting
• Unusual tiredness

• Chills
• Constipation
• Cough, hoarseness, runny or stuffy nose, sinus problems, sneezing, and/or sore throat
• Diarrhea
• Dizziness
• Fast or pounding heartbeat
• Increased thirst
• Irritability
• Loss of appetite
• Sexual problems in males

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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