What should I watch for?
It may take a week or more for this medicine to take effect. This is why it is very important to continue taking the medicine and not miss any doses. If you have been taking this medicine regularly for some time, do not suddenly stop taking it. Ask your doctor or health care professional for advice.
Rarely, this medicine may increase thoughts of suicide or suicide attempts in children and teenagers. Call your child's health care professional right away if your child or teenager has new or increased thoughts of suicide or has changes in mood or behavior like becoming irritable or anxious. Regularly monitor your child for these behavioral changes.
For males, contact you 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 serious problem and must be treated right away to prevent permanent damage.
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. 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 allergies without asking your doctor or health care professional for advice. Some ingredients can increase possible side effects.
Your mouth may get dry. Chewing sugarless gum or sucking hard candy, and drinking plenty of water will help.
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 immediately if any of the following side effects occur:
Hives or welts
large, hive-like swelling on the face, eyelids, lips, tongue, throat, hands, legs, feet, or sex organs
redness of the skin
Painful, prolonged erection of your penis
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:
Acid or sour stomach
bleeding between periods
change in amount of bleeding during periods
change in pattern of monthly periods
decrease in the frequency of urination
decrease in urine amount
decreased interest in sexual intercourse
difficulty having a bowel movement (stool)
difficulty in passing urine (dribbling)
inability to have or keep an erection
loss in sexual ability, desire, drive, or performance
pain or tenderness around the eyes and cheekbones
shortness of breath
sleepiness or unusual drowsiness
stomach discomfort, upset, cramps, or pain
stuffy or runny nose
tightness of the chest
unusual drowsiness, dullness, tiredness, weakness, or feeling of sluggishness
unusual stopping of menstrual bleeding
unusual tiredness or weakness
blistering, crusting, irritation, itching, or reddening of the skin
bloated or full feeling
burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
change in hearing
change or problem with discharge of semen
cracked, dry, or scaly skin
difficulty with moving
dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
excess air or gas in the stomach or intestines
feeling of warmth, redness of the face, neck, arms, and occasionally, upper chest
feeling unusually cold
general feeling of discomfort or illness
increased or sudden sweating
loss of appetite
muscle aches, cramping, pains, or stiffness
pain or burning with urination
swelling of the skin
swollen, tender prostate
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.