Generic name: Sildenafil citrate
Brand names: Viagra

Viagra an oral drug for treating impotence, also known as ED. Viagra is one of the most popular drugs used for treating ED. It proved its effectiveness both in clinical trials and post clinical use. Viagra activation time is about 30 minutes and its effect may last up to 5 hours.

Viagra enhances sensitivity to sexual stimulation and is used to treat ED in men. It makes possible to achieve and maintain an erection during sexual intercourse.

Viagra is taken orally 30 minutes before sexual intercourse. Taking fat food with Viagra may interfere with drug activation time.

Viagra works by boosting the blood flow into the penis thus providing hard and maintaining erection.

Viagra should not be used with drugs containing nitrates (they are usually taken for the treatment of heart-related diseases). Taking Viagra with these drugs can bring on a severe drop in blood pressure.
If you suffer from severe heart problems you must avoid taking Viagra or any other ED treatment drugs.

Some people do not experience any side effects when taking Viagra. But if any of the following serious side effects occur to you, stop taking Viagra and inform your doctor right away: difficulty breathing, blocked throat; swelling of face, or itchiness, limb swelling, frequent heartbeat, severe dizziness, or painful erection.
Less serious common side effects include the following conditions: flushing; rash, stuffy nose, diarrhea, vision changes or headache. Do not stop taking Viagra if you experience any of these mild side effects, just talk to your doctor if they persist.
If you are over 60, the possibility of the above mentioned conditions is higher. Your doctor may decrease your dose of this medication.