To evaluate the safety and tolerability of multiple doses of YK-1169 in healthy subjects, the pharmacokinetic characteristics of multiple doses in healthy subjects, and the drug interaction between cefepime and avibactam.

A randomized, single-blind, placebo-controlled, dose-escalation, single-center clinical trial design was used. A total of 5 dose groups A1, A2, A3, A4 and A5 were set in the test, including A1 YK-1169 0.5g group (containing cefepime 0.4g and avibactam 0.1g), A2 YK-1169 1.25g group (containing cefepime 1.0g and avibactam 0.25g), A3 YK-1169 2.5g (containing cefepime 2.0g and avibactam 0.5g), A4 YK-1169 3.75g (containing cefepime 3.0g and avibactam 0.75g) and A5 YK-1169 5.0g (containing cefepime 4.0g and avibactam 1.0g).

A single-center, randomized, open, three-period three-crossover 3 × 3 Latin square trial design was used. To study the effect of intravenous infusion of this product, cefepime for injection or avibactam for injection on the disposition process of the drug in the human body, so as to study whether there is a pharmacokinetic drug interaction in this product.

Inclusion Criteria:

1. healthy subjects aged 18 to 45 years (including the cut-off value), both men and women;
2. body mass index (BMI) 19.0-28.0 kg/m2 (including the cut-off value);
3. fully understand the purpose of the trial, basically understand the pharmacological effects of the investigational drug and possible risks, voluntarily sign the informed consent form;
4. be able to communicate well with the investigator, and understand and abide by the requirements of this study.

Exclusion Criteria:

1. participate in any drug clinical trials or use of study drugs within 3 months before the use of study drugs;
2. have a history of respiratory system, digestive system, cardiovascular system, endocrine system, urinary system, nervous system (such as epilepsy, etc.), hematology, immunology (including personal or family history of hereditary immunodeficiency), metabolic abnormalities and the investigator believes that there is still clinical significance;
3. allergic to penicillins, allergic to cephalosporins, allergic to amoxicillin clavulanate potassium tablets or their excipients, or a history of drug, food or other substance allergy;
4. can not tolerate intravenous puncture or have a history of halo, fainting needle;
5. received surgery within 6 months before the use of study drugs that will affect drug distribution, metabolism, excretion; or received surgery within 4 weeks before the use of study drugs; or plan to undergo surgery during the study period; -
6. Use of any drugs (including Chinese herbal medicine, health products, etc.) within 14 days before the use of the study drug;
7. Vaccination or live attenuated vaccine within 14 days before the use of the study drug, or plan to vaccinate during the trial;
8. Blood donation or massive blood loss (> 400 mL) within 3 months before the use of the study drug, receiving blood transfusion or use of blood products, or intend to donate blood or blood components during the trial or within 3 months after the end of the trial;
9. Drug abusers or use of soft drugs (such as marijuana) or hard drugs (such as cocaine, phencyclidine, etc.) within 1 year before the use of the study drug;
10. Smokers or smokers who smoke more than 5 cigarettes per day for 3 months before the use of the study drug, or can not stop using any tobacco products during the trial;
11. habitual drinking, tea, coffee and/or caffeine-containing beverages and do not agree to stop eating the above diet during the trial;
12. special requirements for diet, can not comply with the unified diet, or lactose intolerance;
13. volunteers (or their partners) during the trial to 3 months after the end of the trial have a pregnancy plan, sperm donation and egg donation plan, or reluctant to take one or more non-drug contraceptive measures (such as complete abstinence, condoms, contraceptive rings, partner ligation, etc.);
14. female volunteers are pregnant or lactating women; or have non-protective sex within 2 weeks before the use of the study drug; or use oral contraceptives within 30 days before the use of the study drug or use of long-acting estrogen or progestogen injection or implants within 6 months before the use of the study drug; 15. physical examination, 12-lead electrocardiogram, vital signs, abdominal ultrasound, chest X-ray, laboratory tests are abnormal clinical significance (subject to the clinician 's judgment);

16. Volunteers may not be able to complete this study for other reasons or have other reasons for not being suitable for the trial judged by the investigator; 17. First cycle admission examination vital signs abnormal clinical significance, drug screening positive, alcohol test positive or female pregnancy test abnormal clinical significance.