The purpose of this study is to evaluate the influence of HRS9531 injection on pharmacokinetics of metformin in healthy subjects.

Inclusion Criteria:

1. Ability to understand the trial procedures and possible adverse events, be able and willing to provide a written informed consent;
2. Male subjects aged 18-45 years on the date of signing informed consent (inclusive);
3. Body weight ≥50 kg, body mass index (BMI) within the range of 20.0-30.0 kg/m2 (inclusive);
4. HbA1c<6.0%.

Exclusion Criteria:

1. Chronic or severe medical history of the respiratory system, circulatory system, digestive system, urinary system, blood system, endocrine system, immune system, nervous system, mental system, etc., or those with existing systemic diseases mentioned above, and judged by the investigator to be unsuitable to participate in this study;
2. Obvious gastric emptying abnormalities or gastrointestinal diseases in the past, or had undergone gastrointestinal surgery (except for gastrointestinal polyps, appendix, and haemorrhoidectomy)
3. Past history or family history of medullary thyroid cancer or multiple endocrine neoplasia type 2 (MEN2), a history of pancreatitis or symptomatic gallbladder stones;
4. Surgery within 6 months prior to dosing, planned to undergo surgery during the study period;
5. Participation in clinical trials of any drug or medical device in the 3 months or 5 half-lives, whichever longer, prior to dosing;
6. Blood donation history or blood loss ≥400 mL within 3 months or ≥200 mL within 1 month before dosing, or received blood transfusion within 3 months before dosing;
7. Allergic constitution includes severe drug allergy or history of drug allergy;
8. Hepatitis B surface antigen (HBsAg), HIV antibody, hepatitis C virus antibody (HCVAb), treponema pallidum specific antibody detection, positive;
9. Abnormal laboratory test results or abnormal examinations considered unsuitable to participate in this trial;
10. History of hypoglycaemia;
11. The investigator considers that the subject has any other factors that would make it inappropriate to participate in this study.