The scientific name for Viagra is sildenafil citrate, and sildenafil citrate is best taken once a week. Do not take sildenafil citrate more than twice a week. The longer the time between uses, the lesser the side effects of the drug will be. Sildenafil Citrate is not recommended for normal people, but for patients with impotence, it must be taken on time and at regular intervals. Sildenafil citrate is a prescription drug and must be given by a doctor according to the patient’s condition after a standardized consultation in a hospital. It is not recommended to use the drug blindly, if the regular use of the body will also cause side effects. Common adverse reactions to sildenafil citrate tablets mainly include headache, flushing, dizziness, nasal congestion, indigestion, visual abnormalities and so on. The drug is forbidden to be used in combination with nitrate drugs, and it is contraindicated for women, people who are allergic to the product, children, and people whose recent cardiovascular state makes them unfit for sexual intercourse. Usual life diet should be light, life should be regular, eat easy to digest food, do not smoke, drink, do not eat too spicy, cold, stimulating food; strengthen exercise, do more aerobic exercise, pay attention to rest, do not stay up all night, avoid exertion.