It is possible to have intercourse twice in a row after taking sildenafil, but it is not recommended. Sildenafil is clinically used to treat erectile dysfunction in men, and the effects of the drug generally last for about four hours after taking it. Therefore, it is theoretically possible to have sex twice in a row after taking the drug. But too much sex is also harmful to the male body. Therefore, it is not recommended to have intercourse twice in a row after taking sildenafil. The use of the drug should be strictly in accordance with the doctor’s advice and should not be abused. The common adverse effects of the drug are mainly headache, flushing, dizziness, nasal congestion, indigestion, and visual abnormalities. Sildenafil is prohibited in combination with nitrate drugs, the drug is contraindicated in women, people who are allergic to the product, children, people whose recent cardiovascular state does not allow them to have sex.