This medicine is a phosphodiesterase inhibitor used to treat sexual function problems such as impotence or erectile dysfunction. In combination with sexual stimulation, this medicine works by helping the blood flow into the penis to achieve and maintain an erection.
Follow the directions for using this medicine provided by your doctor. This medicine comes with a patient information leaflet. Read it carefully. Ask your doctor, nurse, or pharmacist any questions that you may have about this medicine. TAKE THIS MEDICINE by mouth as needed 1 hour before sexual activity or as directed by your doctor. DO NOT TAKE THIS MEDICINE more often than once daily as needed. If you are taking certain other medicines you may only be able to take this medicine one time every three days. Contact your doctor or pharmacist for more information. This medicine may be taken on an empty stomach or with food. However, taking this medicine with a high-fat meal may reduce the amount of medicine that your body absorbs. AVOID EATING GRAPEFRUIT OR DRINKING GRAPEFRUIT JUICE while being treated with this medicine unless your doctor instructs you otherwise.
SIDE EFFECTS that may occur while taking this medicine include headache, flushing, stomach upset or nausea, heartburn, stuffy or runny nose, diarrhea, dizziness, or lightheadedness. Rarely vision changes such as increased sensitivity to light, blurred vision, or impaired blue/green color discrimination may also occur. If these continue or are bothersome, check with your doctor. CONTACT YOUR DOCTOR IMMEDIATELY if you experience fast, slow, or irregular heartbeats. SEXUAL ACTIVITY may put extra strain on your heart, especially if you have heart problems. If you have heart problems and experience any serious side effects while having sex, stop having sex and tell your doctor immediately. These side effects include severe dizziness, fainting, chest pain, or nausea. In the unlikely even that you have a painful or prolonged erection (lasting more than 4 hours), stop using this medicine and seek immediate medical attention or permanent problems could occur. AN ALLERGIC REACTION to this medicine is unlikely but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include rash, itching, unusual swelling, severe dizziness, or trouble breathing. If you notice other effects not listed above, contact your doctor, nurse, or pharmacist.
Do NOT TAKE THIS MEDICINE if you have had an allergic reaction to it in the past or to any other ingredient that is found in it. THIS MEDICINE MAY CAUSE DIZZINESS OR VISION CHANGES. DO NOT DRIVE, OPERATE MACHINERY, OR DO ANYTHING ELSE THAT COULD BE DANGEROUS until you know how you react to this medicine. Using this medicine alone, with other medicines, or with alcohol may lessen your ability to drive or to perform other potentially dangerous tasks. TO MINIMIZE DIZZINESS OR LIGHTHEADEDNESS, sit up or stand slowly when rising from a seated or lying position. Your dose is based on your medical condition, response to therapy, and the other medicines you are taking. DO NOT EXCEED THE RECOMMENDED DOSE without checking with your doctor. Rarely, this medicine may change heart rhythm, especially if taken with other medicines that can change the heart rhythm. This change in heart rhythm can result in serious, rarely fatal, irregular heartbeats. Ask your doctor for more information and if you should stop taking any of your other medicines to reduce the risk of this side effect. BEFORE YOU BEGIN TAKING ANY NEW MEDICINE, either prescription or over-the-counter, check with your doctor or pharmacist. CAUTION IS ADVISED WHEN USING THIS MEDICINE IN THE ELDERLY because they may be more sensitive to the side effects of this medicine. THIS MEDICINE SHOULD NOT BE USED IN WOMEN OR CHILDREN.
Drug interactions can result in unwanted side effects or prevent a medicine from doing its job. Use our drug interaction checker to find out if your medicines interact with each other. Check drug interactions
If overdose is suspected, contact your local poison control center or emergency room immediately. Symptoms of overdose may include back pain, muscle pain, and abnormal vision.
STORE THIS MEDICINE at room temperature 77 degrees F (25 degrees C) in a tightly-closed container, away from heat and light. Brief storage between 59 and 86 degrees F (15 and 30 degrees C) is permitted.