Exploring the PK of Different Doses of Naltrexone in Patients With AUD

Selection criteria: 1. Volunteer to participate in clinical research; Fully understand and be informed of this experiment and sign informed consent; Willing to follow and capable of completing all testing procedures; 2. The age at the time of signing the informed consent form is ≥ 18 years old; 3. Patients diagnosed as moderate to severe alcohol use disorders based on the Diagnostic and Statistical Manual of Mental Disorders, 5th edition (DSM-5) (four or more items that meet the diagnostic criteria); 4. Have completed withdrawal treatment and have no obvious alcohol withdrawal symptoms for at least one week (≥ 7 days) before randomization/administration \[Clinical Institute Alcohol Dependence Withdrawal Assessment Form (CIWA-Ar) score\<7 points\]; 5. Able to provide TLFB alcohol consumption information 2 weeks prior to withdrawal and/or screening; 6. During the 4-week period before withdrawal and/or screening, drink heavily at least twice a week; Qualified subjects of childbearing age (male and female) must agree to take effective contraceptive measures (hormone or barrier therapy or abstinence) with their partners during the trial period. Exclusion criteria: Participants who meet any of the following criteria cannot be selected for the experiment: 1. The researcher determines that participating in this experiment does not comply with the rights and interests of the subjects, or any other circumstances that do not allow the subjects to conduct the study safely; 2. Pregnant and reproductive age women with positive pregnancy tests or lactating women, including those who planned to conceive during the study period. Note: Here, women of childbearing age refer to women with fertility. The following criteria must be met, regardless of their sexual orientation or whether they have undergone tubal ligation: 1) have not undergone hysterectomy or bilateral ovariectomy; Or 2) Have not experienced natural menopause for more than 12 consecutive months (i.e., have menstruated at any time during the previous 12 consecutive months); 3. Significant abnormalities in liver function (such as AST or ALT exceeding twice the upper limit of normal values) or liver failure (including but not limited to: abdominal fluid accumulation, prolonged prothrombin time, international standard ratio (INR) ≥ 1.7, esophageal varicose disease) or liver and gallbladder ultrasound display results have a significant impact on the judgment of the efficacy and safety of the study drug; 4. Suffering from uncontrollable active infectious diseases in clinical practice, such as active hepatitis B (positive for hepatitis B surface antigen (HBsAg) detection and hepatitis B virus (HBV) deoxyribonucleic acid (DNA) copy number\>1000 IU/ml), active hepatitis C (positive for hepatitis C virus antibody and hepatitis C virus (HCV) ribonucleic acid (RNA)), etc; 5. A history of congenital hemorrhagic disease (such as hemophilia) or any clinically significant bleeding, or abnormal platelet function, or prothrombin time (PT) exceeding the upper limit of normal values by more than 3 seconds (sec) during coagulation function testing, or platelet count\<50 × 109/L； 6. Previous history of severe pancreatitis or severe tremor delirium episodes; 7. According to the judgment of the researchers, the subjects have any severe/uncontrollable systemic diseases (such as respiratory, circulatory, digestive, nervous, hematological, urogenital, endocrine system diseases) or mental illnesses (such as severe depression, schizophrenia, bipolar disorder, etc.) or other major diseases that the researchers believe will hinder the provision of informed consent and make participation in the study unsafe Complicating the interpretation of research outcome data or otherwise affecting the achievement of research objectives; 8. Hospitalization or surgery may be required during the study period, including planned elective surgery or hospitalization that cannot be postponed; 9. According to the DSM-5 standard, currently diagnosed (within one year prior to randomization/administration) with substance use disorders other than alcohol, such as benzodiazepines, amphetamines, opioids, or cocaine; 10. Within 30 days before randomization/administration, I have taken drugs to prevent relapse (such as naltrexone) or received systematic psychological support treatment; 11. Currently undergoing treatment for opioid, amphetamine, alcohol, and other substance use disorders, or receiving opioid treatment within 7 days before randomization/administration, opioid treatment may be required during the study period, or on the day of randomization/administration, urine opioid, marijuana, amphetamine, and other drugs tested positive or naloxone challenge test positive; 12. Allergies to research drugs or their excipients (polylactic acid, magnesium stearate), local anesthetics; 13. Participating in any study drug or device research, or having used any study drug or device within 30 days prior to randomization/administration; 14. If there is a skin infection or systemic skin disease at the site of implantation surgery, it is determined that it can affect the effectiveness and safety evaluation of the study drug; 15. Clinical or laboratory evidence suggests that human immunodeficiency virus (HIV) or syphilis are carried/infected.