Take this drug by mouth. Take it as directed on the prescription label at the same time every day. Keep taking it unless your health care provider tells you to stop. Talk to your health care provider about the use of this drug in children. Special care may be needed.

Side effects that you should report to your doctor or health care professional as soon as possible:

• blurred vision
• difficulty breathing, shortness of breath
• fainting spells, light headedness
• fast or irregular heartbeat, palpitations or chest pain
• numbness in hands or feet
• prolonged painful erection of the penis
• swelling of the legs or ankles
• 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):
• constipation or diarrhea
• headache
• nausea
• sexual difficulties
• stomach pain

Our pharmacists will check to see if this medication will cause any interactions with the information in your profile.

• diuretics
• medicines for high blood pressure
• sildenafil
• tadalafil
• vardenafil