Viagra generic name is sildenafil citrate tablets, which can be taken up to once a day, it is recommended to take it every other day and not more than 15 times a month, which usually does not harm the body. Sildenafil citrate tablets can increase blood flow to the penis and improve erectile function, and are clinically used in the treatment of erectile dysfunction, and do little harm to the body when taken correctly. This product should be taken as needed, up to once a day, and it is recommended to be used every other day, and should not be used continuously, so it should not be taken more than 15 times a month. Frequent side effects of this product include visual abnormalities, headache, flushing, myalgia, back pain, etc. It is contraindicated in people with known allergies to this product and in patients using nitrates. It is recommended to take it under the supervision of a physician and should not be used blindly.