Guanabenz (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:

• Dizziness (severe)
• Irritability
• Nervousness
• Pinpoint pupils
• Slow heartbeat
• Unusual tiredness or weakness

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:

• Dizziness
• Drowsiness
• Dryness of mouth
• Weakness

• Decreased sexual ability
• Headache
• Nausea

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:

• Anxiety or tenseness
• Chest pain
• Fast or irregular heartbeat
• Headache
• Increased salivation
• Increase in sweating
• Nausea or vomiting
• Nervousness or restlessness
• Shaking or trembling of hands or fingers
• Stomach cramps
• Trouble in sleeping

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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