Viagra is a very common drug in the treatment of erectile dysfunction, the drug name of Viagra is Sildenafil, the main role is to improve the content of nitric oxide in the penile corpus cavernosum, thereby improving the blood supply to the penile corpus cavernosum, enhance the hardness and duration of erection. The general price of Viagra is about 50 yuan a piece, mainly taken 1-3 hours before sex, after taking the patient to have sex, the penis needs to be sexually stimulated to get an erection. The effect of Viagra is better for improving the erectile hardness of the penis. Generally for patients with premature ejaculation, after taking Viagra orally, the duration of prolonged sexual life varies from person to person and cannot be determined. Some patients may have poor results after taking Viagra orally, mainly for patients with erectile dysfunction who can take it, and for patients with premature ejaculation it is generally not recommended to apply Viagra.