RetaMaps

Penn Metabolic Medicine — David M. Merrick, MD, PhD

Penn Metabolic Medicine University City · 3737 Market Street, 9th Floor · Philadelphia, PA 19104

Listing updated October 2, 2026

Retatrutide outlook for this practice

No current plans confirmed — RetaMaps has not yet confirmed this practice's intentions regarding retatrutide. Inclusion on RetaMaps does not mean the provider offers or will offer retatrutide.

About this practice

Penn Metabolic Medicine University City (3737 Market Street, 9th Floor, Philadelphia) is a Penn Medicine academic clinic for obesity and weight management, including weight gain after bariatric surgery, lipodystrophy, and diabetes management before bariatric surgery. David M. Merrick, MD, PhD, is an assistant professor of endocrinology who accepts new adult patients; insurance is accepted. Official profile text does not name GLP-1 brands. This is a different campus from Penn endocrinology at HUP Civic Center.

Services & access

Advertises semaglutide todayNot listed
Advertises tirzepatide todayNot listed
Telehealth visits—
Cash pay acceptedYes
Accepts insurance — per practice websiteYes
Accepting new patients — per practice websiteYes

"Not listed" means we didn't find this stated on the practice's public pages — it doesn't mean no. — means unknown. Medication rows describe currently FDA-approved GLP-1 medications the practice advertises today, not retatrutide. Confirm details directly with the practice.

Clinicians

  • David Michael Merrick, MD, PhD

Nearby providers in Philadelphia

Retatrutide status
Phase 3 complete · Not FDA-approvedUpdated October 2, 2026

Retatrutide is Eli Lilly's investigational once-weekly triple agonist (GIP, GLP-1 and glucagon receptors). Five Phase 3 trials have reported positive results, and Lilly plans to submit it to the FDA in Q1 2027. It is not FDA-approved, has no brand name or price, and cannot be prescribed outside clinical trials or Lilly's physician-requested expanded access program. Products sold online as "research" or compounded retatrutide are not legitimate retatrutide.

Development
Phase 3 complete
FDA status
Submission planned — Q1 2027 (Lilly guidance)
Availability
Not commercially available
Access routes
Clinical trials, or Lilly's expanded access program (physician must apply)

Next milestone: TRIUMPH-5 head-to-head vs tirzepatide results (Expected ~Dec 2026)

Sources: Lilly — What to know about retatrutide · Lilly — TRIUMPH-2/TRIUMPH-3 results · BioPharma Dive — FDA submission plans · STAT — Lilly expanded access (Aug 3, 2026) · FDA — Concerns with unapproved GLP-1 drugs