Sildenafil Citrate Tablets, a drug commonly used in clinical practice for the treatment of male erectile dysfunction, has been used for a long time, and its efficacy is precise and well-received in clinical practice. After taking the drug orally, the main effect is to increase the nitric oxide content of the penile corpus cavernosum, thereby stretching the arteries and corpus cavernosum of the penis, making the blood supply to the penis more adequate during erection, and then improve the hardness and duration of the penis erection. Generally sildenafil tablets need to be taken orally 1-3 hours before sexual intercourse, with a maximum of one tablet a day. Some common side effects are mainly headache, dizziness, flushing and other symptoms, patients can stop the drug at any time according to their needs. It is generally recommended to take one tablet orally before sex 2-3 times a week, which is still very helpful for the treatment of erectile dysfunction.