Study to Evaluate AD04 in Adults With Alcohol Use Disorder (AUD) and Selected Serotonin Transporter Polymorphisms

Inclusion Criteria:

1. The subject has signed the Informed Consent Form.
2. The subject has breath alcohol concentration (BAC) of 0.00% at the Screening and < 0.02 % at the Baseline visit.
3. The subject has moderate to severe diagnosis of AUD as measured by Diagnostic andStatistical Manual of Mental Disorders, 5th Edition (DSM-5) criteria.
4. Males and females aged 18 and over.
5. Able to provide Timeline Follow-back Method (TLFB) alcohol consumption information forthe 28-day period prior to Screening Visit.
6. A subject is eligible for participation in the study if he/she had:
7. ≥6 HDDs (HDD is defined as a day with alcohol consumption of 60 g or more formales and 40 g or more for females) in the 4 weeks prior to the Baseline Visit,
8. an average alcohol consumption at the medium risk level (defined by the WHO "International guide for monitoring alcohol consumption and related harm" as >40grams of ethanol/day for males and >20 grams of ethanol/day for females) for the 4 weeks prior to the Screening Visit,
9. ≤14 consecutive abstinent days in the 4 weeks preceding the Screening Visit.
10. Willingness to provide a blood sample for DNA analysis at the Screening visit. Theblood sample collected for DNA testing contains at least one of the followinggenotypes as measured by Adial's validated method:

• rs4795541-LL genotype of the insertion-deletion polymorphism (5'-HTTLPR) in the 5'-regulatory region and rs1042173-TT SNP in the 3'-untranslated region of SLC6A4gene that encodes the serotonin transporter
• rs1150226-AG SNP in HTR3A, the gene that encodes subtype A of the serotonin-3receptor
• rs1176713-GG SNP in HTR3A, the gene that encodes subtype A of the serotonin-3receptor
• rs17614942-AC in HTR3B, the gene that encodes subtype B of the serotonin-3receptor

8. Expressed a wish to reduce or stop alcohol consumption.
9. Willingness to participate in behavioral and medicinal treatments for AUD.
10. Has had a stable residence in the 28 days prior to the Baseline Visit in the study andhas no plans to move in the next 9 months. A stable residence is a domicile in whichan individual can operate as if it were his or her own homestead and does not includeshelters or halfway houses.
11. Provides contact information for 2 individuals who can be used to contact the subject.
12. Able to read and understand, and complete the rating scales and questionnairesaccurately, follow instructions, and make use of the behavioral treatments.
13. The subject, if female must:

• have a negative urine pregnancy test prior to the initiation of treatment andagree not to try to become pregnant during the study
• use two adequate methods of contraception [intrauterine device, oralcontraceptives, progesterone implanted rods, or regular medroxyprogesteroneacetate injections in addition to condom or diaphragm, or double barrier method (condom or diaphragm + spermicide)], or
• be post-menopausal having had the last natural menstruation at least 24 monthsprior to the Screening Visit, or
• have had a hysterectomy or been surgically sterilized prior to baseline.

Exclusion Criteria:

1. Patients with withdrawal symptoms requiring additional medication for withdrawal. Ifpresent at Screening/Baseline Visit, subjects must complete a medically superviseddetoxification program prior to being able to enroll in the study.
2. Subjects with diagnosis of any of the following concomitant psychiatric disorders:non-treated, unstable schizophrenia, bipolar disorder, other psychotic disorder duringthe lifetime of the subject. Recent (within last 12 months) diagnosis of a majordepressive disorder, post traumatic stress disorder, panic disorder or eatingdisorders. Subjects with nicotine use disorder, phobic or other anxiety disorders (other than post-traumatic stress disorder or panic disorder) can be included.
3. The subject reports current or recent (within 8 weeks prior to Baseline Visit)treatment with antipsychotics or antidepressants medications, which can have an effecton serotonin receptor or transporter actions.
4. The subject has been treated with any investigational medicinal product within 30 daysor 5 half-lives (whichever is longer) prior to the Baseline Visit.
5. The subject is currently participating or has recently (4 weeks prior to the BaselineVisit) participated in a treatment program for alcohol use disorders.
6. Any subject who has suicidal thoughts as evaluated by the Columbia Suicide SeverityRating Scale (C-SSRS) (i.e., has any suicidal ideation of type 4 or 5 on the C-SSRS inthe last month).
7. The subject has a clinically significant untreated and unstable illness, for example,hepatic or renal insufficiency, or a cardiovascular, pulmonary, gastrointestinal,endocrine, neurological, infectious, neoplastic, or metabolic disturbance.
8. The subject has clinically significant abnormal vital signs.
9. The subject has a clinically abnormal ECG at the Screening/Baseline Visit, clinicallysignificant cardiovascular disease requiring regular or intensive clinical monitoring,a current history of arrhythmias, or a current or past history of clinicallysignificant QT prolongation, including:

• QTcF > 450 ms (one ECG at screening and average of 3 12-lead measurements atbaseline)
• serum potassium, magnesium or calcium levels outside the central laboratory'sreference range
• receiving medications (within the last 7 days prior to the Baseline Visit) thathave the potential of prolonging the QT interval or may require such medicationsduring the course of the study
• clinically unstable cardiac disease, including unstable atrial fibrillation,symptomatic bradycardia, unstable congestive heart failure, active myocardialischemia or indwelling pacemaker
• complete left bundle branch block
• history of Long QT Syndrome or an immediate family member with this condition

10. The subject with elevated liver function tests or diagnosis of hepatic failure,esophageal variceal disease or any other clinically significant hepatic disease. Theclinical evidence may include any of the following: prolonged prothrombin time (International Normalized Ratio, INR≥1.7) with bilirubin > 10% above the upper limit,and/or serum glutamic oxaloacetic transaminase (SGOT), and/or serum glutamic pyruvictransaminase (SGPT) and/or lactate dehydrogenase (LDH) > 3x the upper limit of normalat screening.
11. The subject reports treatment, either current or within 28 days prior to the BaselineVisit, with any medications having a potential effect on alcohol consumption andrelated behaviors or mood. These include opiate antagonists (e.g., naltrexone,Vivitrol®, Selincro®), glutamate antagonists (e.g., acamprosate), anticonvulsants (e.g., topiramate), serotonin reuptake inhibitors (e.g., fluoxetine), serotoninantagonists (e.g., buspirone), other antidepressants (e.g., tricyclic antidepressantsor monoamine oxidase inhibitors), dopamine antagonists (e.g., haloperidol), anddisulfiram (Antabuse®). Note benzodiazepines are allowed if used chronically.
12. Previous or current abuse of benzodiazepines.
13. At Baseline Visit, the subject's urine contains prescription and non-prescriptiondrugs with abuse potential or other psychotropic agents not otherwise specified,including herbal agents such as St John's Wort that could interfere with the drugtreatment.
14. The subject has a history of allergic reactions or other known intolerance toondansetron or other 5-HT3 antagonists.
15. Female subjects of childbearing potential who have a positive pregnancy test atScreening/Baseline Visit or are pregnant, breast feeding and who are unwilling toadhere to an acceptable form of contraception or meet the other criteria for inclusionas specified for females in the inclusion criteria (See Inclusion Criteria, Item # 13).
16. The subject received in-patient or out-patient treatment for alcohol use disorderwithin the 28 days prior to the Baseline Visit.
17. As of the Baseline Visit, the subject is compelled to participate in an alcoholtreatment program to maintain his/her liberty.
18. As of Baseline Visit, the subject is sharing a household with a subject randomized toany investigational trial of ondansetron.
19. Any other condition or therapy that in the investigator's opinion may pose a risk tothe subject, prevent the subject from completing the required study procedures orinterfere with the study objectives.