Viagra is the trade name and the generic name is sildenafil citrate tablets, normal people who take sildenafil citrate tablets usually do not experience impotence. Sildenafil citrate tablets are medications used to treat erectile dysfunction. The common adverse reactions of this drug mainly include headache, flushing, dizziness, nasal congestion, indigestion, and visual abnormalities. Rare adverse reactions mainly include facial edema, shock, weakness, pain, rash, tachycardia, palpitations (rapid heartbeat, often accompanied by panic), hypotension, postural hypotension. Impotence does not usually occur. There are many causes of impotence, such as age factors, chronic diseases of the body, mental and psychological factors, drug factors, bad habits, etc. It is necessary to go to the hospital for further examination to clarify the cause of the disease and follow the doctor’s instructions for treatment. The drug is forbidden to be used in combination with nitrate drugs, women, people who are allergic to this product, children, recent cardiovascular status should not have sex with the crowd prohibited this drug. Patients taking sildenafil citrate tablets should consult a doctor before using the drug, take it under his guidance, do not take it blindly on your own.