Shenzhen Haiwang intlong Biotechnology Co., Ltd

Primary objective: To compare the differences in absorption extent and rate of a single oral administration of sildenafil citrate orodisintegrating tablets (50 mg/tablet) produced by Fuzhou Haiwang Fuyao Pharmaceutical Co., Ltd. and sildenafil citrate orodisintegrating tablets (50 mg/tablet, trade name: Viagra®) produced by Fareva Amboise, a licensed company of Pfizer Limited, in healthy people under fasting conditions, and to evaluate the bioequivalence of the two oral preparations under fasting conditions. Secondary objective: To evaluate the safety and tolerability of sildenafil citrate orodisintegrating tablets (50 mg/tablet) produced by Fuzhou Haiwang Fuyao Pharmaceutical Co., Ltd. under fasting conditions.

Primary objective: To evaluate the bioequivalence of norfloxacin capsules in healthy Chinese adult male and female subjects when taken orally on an empty stomach. Secondary objective: To evaluate the safety of norfloxacin capsules when taken orally on an empty stomach.

Primary objective: To evaluate the bioequivalence of norfloxacin capsules in healthy Chinese adult male and female subjects after oral administration. Secondary objective: To evaluate the safety of norfloxacin capsules after oral administration.