This medication may interact with the following:
-Certain medications for blood pressure, heart disease, irregular heartbeat
-Certain medications for mental health conditions
-Certain medications for seizures, such as carbamazepine, phenobarbital, phenytoin
-Certain medications for sleep
-Ketoconazole
-Opioid medications
-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 medications, foods, dyes, or preservatives
-Pregnant or trying to get pregnant
-Breast-feeding

Visit your care team for regular checks on your progress. Check your heart rate and blood pressure as directed. Ask your care team what your heart rate and blood pressure should be and when you should contact them.
You may get dizzy or drowsy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medication 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 medication. Tell your care team if you have been vomiting and cannot take this medication 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 care team if the problem does not go away or is severe.

Keep out of the reach of children and pets.
Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Throw away any unused medication after the expiration date.