The generic name of Viagra is Sildenafil Citrate Tablets and normal people may experience side effects such as visual abnormalities, flushing, headache, and indigestion when taking it. Sildenafil Citrate is mainly indicated for male patients with erectile dysfunction and is not recommended for normal people. Sildenafil citrate inhibits phosphodiesterase type 5, which is found not only in the smooth muscle of the corpus cavernosum but also in several organs. As a result, dyspepsia, visual abnormalities, headache, flushing, myalgia, nausea, back pain, and nasal congestion may occur with use in normal subjects. It is clinically contraindicated in people with known allergies to the product, people taking nitrate drugs, etc. If there is a problem of erectile dysfunction, please use the drug under the supervision of a physician, and normal people should not take the drug indiscriminately.