GUANFACINE (GWAHN fa seen) is used to treat high blood pressure.
Take this medicine by mouth with a glass of water. Follow the directions on the prescription label. Take your doses at regular intervals. Do not take your medicine more often than directed. Do not stop taking except on your doctor's advice. Stopping this medicine too quickly may cause serious side effects or your condition may worsen. You must gradually reduce the dose or you may get a dangerous increase in blood pressure. Ask your doctor or health care professional for advice.
Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.
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 vision
chest pain or chest tightness
irregular, fast or slow heartbeat
redness, blistering, peeling or loosening of the skin, including inside the mouth
signs and symptoms of low blood pressure like dizziness; feeling faint or lightheaded, falls; unusually weak or tired
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
change in sex drive or performance
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
narcotic medicines for pain
If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.
Keep out of the reach of children.
Store at room temperature between 15 and 30 degrees C (59 and 86 degrees F). Protect from light. Keep container tightly closed. Throw away any unused medicine after the expiration date.
They need to know if you have any of these conditions:
heart disease or recent heart attack
history of stroke
an unusual or allergic reaction to guanfacine, other medicines, foods, dyes, or preservatives
pregnant or trying to get pregnant
Visit your doctor or health care professional for regular checks on your progress. Check your heart rate and blood pressure regularly while you are taking this medicine. Ask your doctor or health care professional what your heart rate should be and when you should contact him or her.
You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. To avoid dizzy or fainting spells, do not stand or sit up quickly, especially if you are an older person. Alcohol can make you more drowsy and dizzy. Avoid alcoholic drinks.
Avoid becoming dehydrated or overheated while taking this medicine.
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.
Do not treat yourself for coughs, colds or allergies without asking your doctor or health care professional for advice. Some ingredients can increase your blood pressure.