Baiyunshan Jingo is the trade name and generic name of Sildenafil, which generally improves the patient’s erectile status for about 4 hours after taking it, but the effect varies among individuals. Sildenafil is used to treat erectile dysfunction in men. Generally, its effects last for about 4 hours. It is important to note that 4 hours of efficacy means that it can improve the patient’s erectile status within 4 hours, not maintain erectile status for 4 hours. However, due to each person’s different physical condition, different medical conditions, and different absorption of the drug, the maintenance time of the drug after use is also different. Application of sildenafil should also be noted that the adverse effects of the drug are angina, gout, low blood pressure. It should not be applied to those who are allergic to sildenafil, those who take nitrate drugs, those who suffer from cardiovascular diseases. When men have erectile dysfunction, they should go to the hospital in time and use the drug under the guidance of a regular doctor.