-certain medicines for blood pressure, heart disease, irregular heart beat
-certain medicines for depression, anxiety, or psychotic disturbances
-certain medicines for seizures like carbamazepine, phenobarbital, phenytoin
-certain medicines for sleep
-ketoconazole
-narcotic medicines for pain
-rifampin

They need to know if you have any of these conditions:

-high blood pressure
-kidney disease
-liver disease
-low blood pressure
-slow heart rate
-an unusual or allergic reaction to guanfacine, other medicines, foods, dyes, or preservatives
-pregnant or trying to get pregnant
-breast-feeding

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.

Keep out of the reach of children.

Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Throw away any unused medicine after the expiration date.