Shanghai Zhongtuo Pharmaceutical Technology Co., Ltd.

The main objective is to evaluate the pharmacodynamic effects of different doses of CMS203 tablets on erectile dysfunction and provide a basis for the clinical usage and dosage of CMS203 tablets.

To evaluate the safety and tolerability of single and multiple oral administration of CMS203 tablets in healthy adult male subjects under fasting conditions; to evaluate the pharmacokinetic characteristics of single and multiple oral escalating doses of CMS203 tablets in healthy adult male subjects; and to evaluate the effect of food on the pharmacokinetics of a single oral administration of CMS203 tablets in healthy adult male subjects.