Sitafloxacin Fumarate

1) To evaluate the safety and tolerability of single and multiple administrations of sitafloxacin fumarate injection within a set dose range in healthy subjects; 2) To conduct a pharmacokinetic study of sitafloxacin fumarate injection in healthy subjects.

1) To evaluate the safety and tolerability of a single dose of sitafloxacin fumarate injection within a set dose range in healthy subjects; 2) To conduct a comparative pharmacokinetic study of sitafloxacin fumarate injection and sitafloxacin tablets in healthy subjects and calculate the absolute bioavailability of the tablets; 3) To conduct an excretion study of sitafloxacin fumarate injection in healthy subjects.