Guanfacine ER Side Effects
What should I watch for?
Visit your doctor or health care professional for regular checks on your progress. Check your heart rate and blood pressure as directed. Ask your doctor or health care professional what your heart rate and blood pressure should be and when you should contact him or her.
You may get dizzy or drowsy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol can make you more drowsy and dizzy. Avoid alcoholic drinks.
Avoid becoming dehydrated or overheated while taking this medicine. Tell your healthcare provider if you have been vomiting and cannot take this medicine because you may be at risk for a sudden and large increase in blood pressure called rebound hypertension.
Your mouth may get dry. Chewing sugarless gum or sucking hard candy, and drinking plenty of water may help. Contact your doctor if the problem does not go away or is severe.
Side Effects to watch for
Side effects that you should report to your doctor or health care professional as soon as possible:
- allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
- changes in emotions or moods
- chest pain or chest tightness
- signs and symptoms of low blood pressure like dizziness; feeling faint or lightheaded, falls; unusually weak or tired
- unusually slow heartbeat
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):