Hengchang (Guangzhou) New Drug Research Co., Ltd.

(1) Primary objective: To evaluate the pharmacokinetic characteristics of the test and reference preparations after a single dose in healthy subjects in the fasting and postprandial state, using finasteride tablets provided by Hengchang (Guangzhou) New Drug Research Co., Ltd. as the test preparation (T) and finasteride tablets (trade name: Propecia®) licensed by Merck Sharp & Dohme Limited and produced by AIAC International Pharma LLC as the reference preparation (R), and to evaluate the bioequivalence of the two preparations in healthy subjects. (2) Secondary objective: To investigate the safety of the test and reference preparations in healthy subjects.

(1) Primary objective: To evaluate the pharmacokinetic characteristics of the test and reference preparations after a single dose in healthy subjects in the fasting and postprandial state, using finasteride dispersible tablets provided by Hengchang (Guangzhou) New Drug Research Co., Ltd. as the test preparation (T) and finasteride tablets (trade name: Proscar®) licensed by Organon Pharma (UK) Limited and produced by AIAC International Pharma LLC as the reference preparation (R), and to evaluate the bioequivalence of the two preparations in healthy subjects. (2) Secondary objective: To investigate the safety of the test and reference preparations in healthy subjects.

The main purpose of the study is to study the pharmacokinetics of the test preparation sildenafil citrate orodisintegrating tablets (specification: 50 mg, produced by Wuhan Haite Biopharmaceutical Co., Ltd., provided by Hengchang (Guangzhou) New Drug Research Co., Ltd.) and the reference preparation sildenafil citrate orodisintegrating tablets (Viagra®, specification: 50 mg; licensed by Pfizer Limited, provided by Hengchang (Guangzhou) New Drug Research Co., Ltd.) in healthy adult male subjects after a single oral administration under fasting conditions, and to evaluate the bioequivalence of the two preparations when taken orally under fasting conditions. Secondary purpose of the study is to study the safety of the test preparation sildenafil citrate orodisintegrating tablets and the reference preparation sildenafil citrate orodisintegrating tablets (Viagra®) in healthy adult male subjects.