Viagra is the most well known treatment for erectile dysfunction (ED) and has helped countless men restore their sexual virility. This medicine contains sildenafil and works by increasing blood flow to the penile region. When a woman is sexually aroused, blood flow to her sexual organs also improves so it works in a very similar way for women. Due to the similarities of the male and female sexual response, many studies have taken place to evaluate the effects of sildenafil in women.