Viagra (brand name for sildenafil) is a fairly well-known drug used to treat erectile dysfunction. Sildenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, sildenafil works by increasing blood flow to the penis to help a man get and keep an erection.

Viagra (sildenafil) relaxes muscles found in the walls of blood vessels and increases blood flow to particular areas of the body.

It was first approved for this use by the FDA in 1998. As with any drug, side effects may occur, and certain situations may increase the severity or frequency of these side effects.

Side effects are broken down into two main categories; common and serious.

Common side effects of Viagra:

Headaches (most commonly reported)
Gastrointestinal complaints (nausea, diarrhea, indigestion, upset stomach)
Flushing of the chest, neck, or face
Abnormal vision (blurred vision, sensitivity to light, or changes in the way colors are seen)
Skin rash
Dizziness
Painful or tender muscles, back pain
Nasal congestion or a runny nose

Serious side effects of Viagra:

Swelling of the hands, ankles, and feet
Hearing loss or ringing in the ears
Changes or total loss of vision – may be in one eye or both (this is rare)

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