Safety and Pharmacokinetics of Y-4 Tablets in Healthy Subjects

Each subject will receive a single dose and multiple doses. During the single dose phase (Day1-Day4), the subjects will be administered with single dose of Y-4 tablets on fasting state in the morning of Day D1. During the multiple dosing phase (Day5-Day13), the subjects will be required to administer with Y-4 tablets continuously for 6 days, BID of Day5-Day9 (once in the morning and once in the evening, Q12h) and QD of Day10, for a total of 11 doses.

Each subject will receive a single dose and multiple doses. During the single dose phase (Day1-Day4), the subjects will be administered with single dose of Y-4 placebos on fasting state in the morning of Day D1. During the multiple dosing phase (Day5-Day13), the subjects will be required to administer with Y-4 placebos continuously for 6 days, BID of Day5-Day9 (once in the morning and once in the evening, Q12h) and QD of Day10, for a total of 11 doses.