What should I watch for?
Visit your doctor or health care professional for regular checks on your progress. Check your blood pressure regularly. Ask your doctor or health care professional what your blood pressure should be and when you should contact him or her.
Drowsiness and dizziness are more likely to occur after the first dose, after an increase in dose, or during hot weather or exercise. These effects can decrease once your body adjusts to this medicine. Do not drive, use machinery, or do anything that needs mental alertness until you know how this drug 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.
Do not treat yourself for coughs, colds, or pain while you are taking this medicine without asking your doctor or health care professional for advice. Some ingredients may increase your blood pressure.
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.
For males, contact your doctor or health care professional right away if you have an erection that lasts longer than 4 hours or if it becomes painful. This may be a sign of a serious problem and must be treated right away to prevent permanent damage.
Common and Rare 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 as soon as possible if any of the following side effects occur:
Dizziness or lightheadedness
dizziness, faintness, or lightheadedness when getting up from a lying or sitting position
fast and pounding heartbeat
shortness of breath
swelling of feet or lower legs
Painful or prolonged erection of the penis (called priapism), although extremely rare, must have immediate medical attention. If painful or prolonged erection occurs, call your doctor or go to an emergency room as soon as possible
Incidence not known
Abdominal or stomach pain
black, tarry stools
blood in urine or stools
chest pain or discomfort
difficult, burning, or painful urination
general tiredness and weakness
headache, sudden and severe
inability to speak
lab results that show problems with liver
loss of appetite
pain or discomfort in arms, jaw, back or neck
pinpoint red or purple spots on skin
slow or irregular heartbeat
sores, ulcers, or white spots on lips or in mouth
tightness in chest
unpleasant breath odor
unusual bleeding or bruising
upper right abdominal pain
vomiting of blood
weakness in arm and/or leg on one side of the body, sudden and severe
yellow eyes and skin
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:
lack or loss of strength
unusual tiredness or weakness
Acid or sour stomach
difficulty in moving
frequent urge to urinate
lower back or side pain
muscle aching, cramping, or weakness
muscle pains or stiffness
nervousness, restlessness, unusual irritability
sleepiness or drowsiness
stomach discomfort, upset or pain
Incidence not known
burning, crawling, itching, numbness, prickling, “pins and needles”, or tingling feeling
change in frequency or urination
feeling of warmth
general feeling of discomfort or illness
hives or welts
increased urge to urinate during the night
increased volume of pale dilute urine
loss of appetite
redness of skin
redness of the face, neck, arms and occasionally upper chest
swelling of the breasts or breast soreness in both females and males
thinning of hair
trouble in holding or releasing urine
waking to urinate at night
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.