Guanfacine (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:

• Blurred vision
• Confusion
• Dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
• Sweating
• Unusual tiredness or weakness

• Chest pain or discomfort
• Cough
• Difficulty with breathing
• Fast, slow, or irregular heartbeat
• Increased need to urinate
• Lightheadedness, dizziness, or fainting
• Mental depression
• Noisy breathing
• Passing urine more often
• Pounding heartbeat
• Shortness of breath
• Tightness in the chest
• Troubled breathing
• Wheezing

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

• Dizziness (extreme) or faintness
• Unusual tiredness or weakness (severe)

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:

• Constipation
• Dizziness
• Drowsiness
• Dryness of the mouth
• Headache
• Irritability
• Nausea
• Sleepiness or unusual drowsiness
• Unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
• Upper abdominal or stomach pain
• Vomiting
• Weight gain

• Acid or sour stomach
• Belching
• Decreased appetite
• Decreased sexual ability
• Dry, itching, or burning eyes
• Headache
• Heartburn
• Indigestion
• Lack or loss of strength
• Paleness of the skin
• Stomach discomfort, upset, or pain
• Trouble with sleeping
• Unusual tiredness or weakness

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
• Increased salivation
• Nervousness or restlessness
• Shaking or trembling of the hands and fingers
• Stomach cramps
• Sweating

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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