1. When it comes to several issues of radical prostate cancer surgery and ED, it is emphasized that the nerve fibers associated with erection should be preserved as much as possible so as to help preserve the patient’s postoperative sexual function. The postoperative sexual function status is related to the level of prostate-specific antigen PSA; the higher the level of this antigen, the worse the prognosis of sexual function; the older the age, the worse the prognosis of sexual function; although the principle is still unclear, the use of phosphodiesterase 5 inhibitors such as cialis (5 mg) daily starting before surgery helps in recovery, and it helps to maintain the length of the penis and helps to overcome the problem of postoperative incontinence. 2. Phosphodiesterase 5 inhibitors such as cialis are useful in the treatment of benign prostatic hyperplasia, and the dose should be higher if combined with ED. 3, the use of phosphodiesterase 5 inhibitors do not blindly increase the dose, although Viagra someone can use up to 500 mg, but for increasing the efficacy of the effect is not very effective. Because 100 mg has inhibited 85% of the enzyme, 200 mg inhibits 95%, and then add no role in the basis. And the adverse drug reactions must be significantly increased, it is definitely more than the loss. 4, if the use of phosphodiesterase 5 inhibitors do not see the effect, you can consider issues such as: whether to give adequate sexual stimulation after taking the drug, the need for androgen supplementation, if androgen supplementation is still ineffective, then from on-demand to daily dosing. 5. Prof. Gerald Brock believed that if the drug is used daily, cialis should be preferred because it has a long half-life and the blood concentration tends to be constant after 2 days, while Viagra used daily will have a gap in the drug every day because of the short half-life. Some doctors at the meeting argued to the contrary, saying that people do not need to maintain a constant concentration of the drug at all times, because people are not always sexually active and adverse effects can exist at any time and anywhere. Professor Gerald Brock did not have a better explanation for this.