Introduction:

Viagra is a Pfizer, Inc registered trademark which contains the active ingredient sildenafil citrate. It is available in 25mg, 50mg, and 100mg doses and is sold through prescription only. It's taken as an oral tablet and has proven to be one of the most successful drugs of the decade for treating Erectile Dysfunction. It is an FDA approved drug and seen as safe for human consumption.

Uses of Viagra:

Viagra is actively used for the treatment of male impotence and works by increasing the blood flow to the penis increasing the body's ability to maintain and achieve an erection during sexual stimulation.

Who should not be taking Viagra:

Viagra is strictly prohibited to:

Men taking nitrates such as nitroglycerin

Viagra should not be used by women or children.

Extreme Side effects of Viagra:
Viagra is reported to have caused:

Heart Attacks

Sudden Death

Irregular Heart Beats

Stroke

Chest Pain

Increased Blood Pressure

However, the side effects are not always directly related to the effect of Viagra as they can be caused due to:

Sexual Activity

Patients Blood Pressure

Patie

A combination of the above factors

That is why it is suggested that the patient take Viagra under a doctor's prescription.

Symptomatic Side Effects:

Headache

Flushing

Upset stomach

Stuffy nose

Urinary tract infection

Visual changes such as mild and temporary changes in blue/green colors or increased sensitivity to light.

Diarrhea

Patients with the following symptoms should use Viagra with care:

Age more than 65

Liver problems

Medications (e.g., ketoconazole, itraconazole, erythromycin and saquinavir).

Such patients are recommended to take a starting dose of 25 mg Viagra.