| Outcome Measures: |
Primary: The primary pharmacokinetics parameters of Cmax To assess the potential pharmacokinetic interaction between HMS5552 and metformin in subjects with T2DM, HMS5552 and metformin PK parameters: PK parameters (Cmax) will be computed for each subject per day with non-compartmental methods using the actual sampling times. Descriptive statistics will be calculated for the PK parameters per day (Days 3, 8 and 13). The effect of metformin on the exposure of HMS5552 will be determined by a PK comparison between the exposure of HMS5552 on Day 13 vs. on Day 8. The effect of HMS5552 on the exposure of metformin will be determined by a PK comparison between the exposure of metformin on Day 8 vs. on Day 3., 13 days | Secondary: The pharmacokinetics parameters of Tmax To assess the potential pharmacokinetic interaction between HMS5552 and metformin in subjects with T2DM, HMS5552 and metformin PK parameters: PK parameters ( Tmax) will be computed for each subject per day with non-compartmental methods using the actual sampling times. Descriptive statistics will be calculated for the PK parameters per day (Days 3, 8 and 13). The effect of metformin on the exposure of HMS5552 will be determined by a PK comparison between the exposure of HMS5552 on Day 13 vs. on Day 8. The effect of HMS5552 on the exposure of metformin will be determined by a PK comparison between the exposure of metformin on Day 8 vs. on Day 3., 13 days|The pharmacokinetics parameters of AUC0-24hr To assess the potential pharmacokinetic interaction between HMS5552 and metformin in subjects with T2DM, HMS5552 and metformin PK parameters: PK parameters (AUC0-24hr) will be computed for each subject per day with non-compartmental methods using the actual sampling times. Descriptive statistics will be calculated for the PK parameters per day (Days 3, 8 and 13). The effect of metformin on the exposure of HMS5552 will be determined by a PK comparison between the exposure of HMS5552 on Day 13 vs. on Day 8. The effect of HMS5552 on the exposure of metformin will be determined by a PK comparison between the exposure of metformin on Day 8 vs. on Day 3., 13 days|Safety assessments includes monitoring of adverse events (AEs), vital signs (blood pressure, pulse rate, respiratory rate and oral temperature), clinical laboratory findings, resting 12-lead electrocardiograms (ECGs), and physical examination findings., Safety assessments will include monitoring of adverse events (AEs), blood glucose via glucometer readings, vital signs (blood pressure, pulse rate, respiratory rate and oral temperature), clinical laboratory findings, resting 12-lead electrocardiograms (ECGs), and physical examination findings on Day 13 , Day 8 and Day-1, 13 days|Pharmacodynamic responses (serum levels) of glucose, insulin and C-peptide will be evaluated., 13 days
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