AGMG: A Clinical Research Legacy Since 1983
Associated Gastroenterology Medical Group remains at the forefront of gastroenterology care, providing access to prominent clinical trials. We’re proud to have been involved in the clinical testing of elite pharmacological innovations including Humira®, Nexium®, Prilosec®, Zantac® and many others. Contact us about currently enrolling trials and eligibility requirements.
Therapeutic Areas of Focus
Gastroenterology (GI)
- GERD
- Irritable bowel syndrome (IBS)
- Constipation
- Inflammatory bowel disease (Crohn’s disease and ulcerative colitis)
- Celiac disease
Hepatology
- Fatty liver disease
- Hepatic dysfunction, MASH, MASLD
Metabolic Dysfunction
- Obesity
- Type 2 Diabetes
- Dyslipidemia
- Hypertension
Meet Our Research Leaders
AGMG Research is led by Dr. Dennis Riff and Dr. Brian Riff, who brings decades of independent clinical and research experience. Dennis Riff, MD, FACG is a pioneer in clinical research, former co-owner of Anaheim Clinical Trials with over 40 years of experience, and Brian Riff, M.D., AGAF grew up in research represents the next generation leadership. Our model is a hybrid research platform embedded within a primary care and gastroenterology practice.
Previous Clinical Trials

Treatment of Inflammatory Bowl Disease (IBD)

Treatment of inflammatory bowel disease (IBD)

Treatment of GERD, Gastroduodenal ulcers

Treatment of GERD, Gastroduodenal ulcers

Treatment of GERD, Gastroduodenal ulcers

Treatment of Inflammatory Bowel Disease (IBD)

Treatment of the Flu

Bowel preparation medication for Colonoscopy

Bowel preparation medication for Colonoscopy

Treatment for Type 2 Diabetes, Can promote Weight Loss
Blockbuster and Breakthrough Therapeutic Experience
Blockbuster Biologic and Immunology Agents (IBD)
- Remicade (infliximab)
First-in-class anti-TNF biologic that transformed IBD treatment
Breakthrough Hepatology Therapies (HCV)
- Intron A
- Ribavirin
Defined the standard of care in hepatitis C prior to modern DAAs
Blockbuster Gastroenterology Class (GERD / Acid Suppression)
- Rabeprazole
- Lansoprazole
Part of the proton pump inhibitor class, one of the largest global GI markets
Breakthrough GI and Infectious Disease Therapies
- Tamiflu
Global antiviral used in pandemic and seasonal influenza management
Foundational and Standard-of-Care GI Therapies
- Mesalamine (Asacol®)
- Balsalazide
Core therapies in ulcerative colitis management
We also piloted the FIRST eCRF data management system, at home colon cancer screening kit among many other firsts.
Contact Angela Aviles
We love what we do, and we love our patients. We hope to see you at Associated Gastroenterology.