Viagra (Sildenafil) As A Treatment For Weak Penis (Erectile Dysfunction):

Modalities

Initial dose: 50 mg orally once a day, as needed, 1 hour prior to sexual activity.

Maintenance: 25 to 100 mg orally once a day, as needed, 1 hour prior to sexual activity

Comments: This drug may be taken anywhere from 30 minutes to 4 hours before sexual activity.

Serious Warning:

DO NOT take sildenafil (Viagra) if you are also using a nitrate drug for chest pain or heart problems, including nitroglycerin, isosorbide dinitrate, isosorbide mononitrate, and some recreational drugs such as "poppers". Taking sildenafil with a nitrate medicine can cause a sudden and serious decrease in blood pressure.

Some medicines can cause unwanted or dangerous effects when used with sildenafil. Tell your doctor about all your current medicines, especially riociguat (Adempas).

Contact your doctor or seek emergency medical attention if your erection is painful or lasts longer than 4 hours. A prolonged erection (priapism) can damage the penis.

Stop using sildenafil and get emergency medical help if you have sudden vision loss.