Sildenafil is not recommended for normal people to take once in a while. Sildenafil is clinically used for the treatment of erectile dysfunction, only patients with the presence of this disease should take the drug, not recommended for normal people. Moreover, taking sildenafil tablets may cause headache, flushing, dizziness, nasal congestion, indigestion, visual abnormalities and other adverse reactions, and taking too much of it can be harmful to men’s health, so it is not recommended for men who can have a normal erection for sexual intercourse. Before taking the drug, it should also be noted that sildenafil is prohibited from combining with nitrate drugs, and this drug is prohibited for women, people who are allergic to the product, children, and people whose recent cardiovascular status makes them unfit to have sex. Patients taking sildenafil tablets should consult a doctor before taking the drug, take it under his guidance, do not take it blindly on your own.