Recruiting
Phase 2

AT673 & Semaglutide

Sponsor:

Antag Therapeutics

Code:

NCT07724340

Conditions

Adults With Overweight/Obesity and Type 2 Diabetes

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Not accepted

Interventions

AT673 low dose

AT673 high dose

Placebo

Study Details

Brief summary:

The goal of this clinical trial is to learn if AT673 contributes to additional weight loss and glycemic control when given with semaglutide in participants with overweight/obesity and type 2 diabetes. The main questions it aims to answer are:

  • To compare the effect on body weight of two doses of AT673 once-weekly versus matched placebo when concurrently administered with semaglutide once-weekly
  • To evaluate the effect of AT673 on glycated hemoglobin (HbA1c)
  • To compare the safety and tolerability of AT673 versus matched placebo when concurrently administered with semaglutide

Conditions

Adults With Overweight/Obesity and Type 2 Diabetes

Study ID

NCT07724340

Start date

Jun 19, 2026

Status verified date

Jul, 2026

Completion date

Mar, 2027

Anticipated

Primary completion date

Feb, 2027

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Not accepted

Inclusion Criteria:

1. Signed informed consent prior to start the Screening Visit procedures.
2. Female and male participants ≥18 years of age at time of consent
3. BMI g ≥27.0 kg/m2 at screening.
4. HbA1c ≥7 and ≤10% (53-86 mmol/mol) at screening.
5. Diagnosis of type 2 diabetes mellitus for ≥ 180 days prior to screening.
6. Either treated with diet and exercise alone or on stable (at least 90 days prior to screening) treatment with metformin, a sodium-glucose cotransporter 2 (SGLT2) inhibitor, sulfonylurea, and/or DPP4 inhibitor as monotherapy or combination therapy, per approved local label.

a) Note: Participants treated with sulfonylureas and/or DPP4 inhibitors must discontinue these at least 24 hours prior to initiation of semaglutide.
7. Participant has had at least 1 unsuccessful attempt at weight loss by diet and exercise in the opinion of the investigator.
8. Women of childbearing potential (WOCBP) meeting the criteria below:

i) Non-lactating and has a negative pregnancy test at screening and baseline -AND- ii) Uses an acceptable method of contraception as determined by the Investigator or Sub-Investigator for the duration of the study and 30 days following the last dose of study drug
9. Participants must, in the opinion of the Investigator, be suitable candidates to receive semaglutide (Wegovy®) as indicated according to the product label.

Exclusion Criteria:

1. Participant has had gastric bypass or other bariatric surgery or endoscopic procedure or any metabolic procedures (e.g. duodenal resurfacing, intragastric balloon, etc.) except for the following:

1. Liposuction and/or abdominoplasty that was performed > 1 year before screening
2. Laparoscopic gastric band that was removed > 1 year before screening
3. Intragastric balloon that was removed > 1 year before screening
4. Duodenal-jejunal bypass sleeve that was removed > 1 year before screening.
2. Participant has had a self-reported or medically recorded change in body weight > 5% within 3 months of screening OR has recorded change in body weight >3% between screening and randomization.
3. Participant is currently using insulin or used insulin within 3 months before screening.
4. Participant is currently using sulfonylureas and/or DPP4 inhibitors and is unable or unwilling to discontinue the use of these medications at least 24 hours prior to initiation of semaglutide.
5. Participant has a form of diabetes other than type 2.

a. Note: Previous diagnosis of gestational diabetes is permitted so long as the participant meets all inclusion and none of the exclusion criteria.
6. Participant is currently using or used within 3 months before screening any weight reducing medication including pramlintide, sibutramine, orlistat, zonisamide, topiramate, phentermine, naltrexone, bupropion.
7. Participant is currently using or used within 6 months before screening any medication that contains a GLP-1R agonist component or a GIPR modulator (either by prescription or as part of a clinical study)
8. For participants with a history of prior GLP-1R agonist use (> 6 months prior to screening):

1. Participant has had a previous intolerance or hypersensitivity to GLP-1 receptor agonists or any of its excipients.
2. Participant has previously discontinued a GLP-1 receptor agonist after continuous treatment for 6 months or longer due to not meeting personal weight loss goals.
9. Participant is taking any medication that, may cause weight gain unless the participant has used these medications for more than 6 months at a stable dose prior to screening.
10. Participant has hepatic liver enzymes aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase levels >2.5, or total bilirubin levels > 1.5 times the upper limit of normal (ULN) at screening.
11. Participant's current alcohol intake exceeds 14 units/week for men or 7 units/week for women (1 unit = half pint of beer, 1 glass of wine, 1 measure of spirits).
12. Participant has a recent history of illicit substance use (< 3 months) or in the opinion of the Investigator suspicion of current illicit substance use.
13. Participant has uncontrolled hypertension at screening (SBP above or equal to 160 mmHg and/or diastolic blood pressure above or equal to 100 mmHg).
14. A corrected QT interval (QTc) of > 450 msec in males or > 470 msec in females at screening, or history of long QT syndrome.
15. Concurrent participation in another interventional study (e.g., of a drug, over the counter product, device) or within ≤90 days or 5 half-lives prior to Screening.
16. Participant is unable to understand and communicate with the investigators; or to understand the protocol requirements, instructions, study-related restrictions, nature, scope, and possible consequences of the clinical study; or is unlikely to comply with the study requirements (e.g., uncooperative attitude and improbability of completing the clinical study).
17. Participant is the investigator or any sub-investigator, research assistant, pharmacist, study coordinator, other staff, or relative thereof directly involved in the conduct of the study, or employee of the sponsor, site, or Contract Research Organization (CRO).
18. Participant whose obesity can be traced to a medical cause, suggestive of genetic or syndromic obesity of an endocrinologic disorder (e.g., hypothyroidism, Cushings syndrome, Prader-Willi syndrome).
19. Participant has a history of an active or untreated malignancy or in remission from a clinically significant malignancy for less than 5 years, except for basal cell carcinoma.
20. Participant has a glomerular filtration rate < 60 mL/min/1.73 m2.
21. Participant has a history of major psychiatric disorders within 5 years or lifetime history of suicide attempt.
22. Participant has any suicidal ideation of type 4 or 5 on the C-SSRS at screening.
23. Participant with a personal or family history of medullary thyroid carcinoma or with multiple endocrine neoplasia (MEN) syndrome type 2.
24. Participant with a previous history of chronic pancreatitis, or acute pancreatitis within 6 months prior to screening.
25. In the opinion of the Investigator, any disorder, condition, inability or unwillingness not covered by the exclusion criteria that may interfere with study procedures, assessments or participant's safety.

Study Design

Enrollment

150 participants

Anticipated

Allocation

Randomized

Intervention Model

Parallel Assignment

Primary purpose

Treatment

Interventions and Outcome Measures

Arms

experimental: Low dose

Low dose AT673, subcutaneous injection administered weekly

experimental: High dose

High dose AT673 subcutaneous injection administered weekly

placebo comparator: Placebo

matching placebo subcutaneous injection administered weekly

Interventions

AT673 low dose

low dose

AT673 high dose

high dose

Placebo

matching placebo

Primary outcome measure

  • Body weight [ Time Frame: 13 weeks ]

Central Contacts and Locations

Locations

CenExel Phoenix

Recruiting

Chandler, Arizona, United States, 85224

Contacts

Lee Ann Stapleton Recruitment Specialist

602-732-6262l.stapleton@cenexel.com

Principal Investigator:

Pallavi Joshi, DO

CenExel Anaheim

Recruiting

Anaheim, California, United States, 92801

Contacts

Silvia Monico Recruitment Manager

714-774-7777s.monico@cenexel.com

Principal Investigator:

Amina Haggag, MD, FAAFP, CDCES, CPI

CenExel Hollywood

Recruiting

Hollywood, Florida, United States, 33024

Contacts

May Fernandez Director of Clinical Operations

954-990-7649m.fernandez@cenexel.com

Principal Investigator:

Craig Shapiro, DO, FAOCO

CenExel Tampa

Recruiting

Tampa, Florida, United States, 33613

Contacts

Beth DeLuca Director of Recruitment

813-264-2155e.deluca@cenexel.com

Principal Investigator:

Deborah White, MD

CenExel Atlanta

Recruiting

Atlanta, Georgia, United States, 30331

Contacts

Amber Tannahill Recruitment Manager

404-881-5800a.tannahill@cenexel.com

Principal Investigator:

Elisa Barron, MD

CenExel Decatur

Recruiting

Decatur, Georgia, United States, 30030

Contacts

Michael Mahaffey Recruitment Specialist

404-537-1281m.mahaffey@cenexel.com

Principal Investigator:

Kimball Johnson, MD

CenExel Savannah

Recruiting

Savannah, Georgia, United States, 31405

Contacts

Michelle Lagares Recruitment Specialist

912-744-0800m.lagares@cenexel.com

Principal Investigator:

Marilyn Lavalle, MD

CenExel SLC

Recruiting

Salt Lake City, Utah, United States, 84107

Contacts

Jenny Hunt Recruitment Manager

801-261-2000j.hunt@cenexel.com

Principal Investigator:

Ryan Black, DO

More Information

Sponsor

Antag Therapeutics

Last update posted

Sep 1, 2026

Last verified

Jul, 2026

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-08. This information was provided to ClinicalTrials.gov by Antag Therapeutics on 2026-09-01.