Fundraising Fox

RonanRx Inc.

YC S26

San Francisco, US · Founded 2026 · 5 employees · 1 known investors

RonanRx offers personalized GLP-1 weight-management care delivered via text, where a licensed physician reviews a patient's history to set an individualized dose, titration schedule, and patient-specific adjunct, and a licensed pharmacist at the patient's selected pharmacy verifies and releases compounded, patient-specific prescriptions. It serves individual patients in the US (availability varies by state) and plans to add hormone therapy (HRT).

Also known as Ronan Rx Inc.

Digital HealthHealthtechWellness & FitnessHealth TechTelehealthTherapeuticsUnited States of AmericaAmerica / Canada

Founders & leadership· Y Combinator alumni (S26)

RonanRx Inc. was founded in 2026 by Lloyd Armbrust and Emily Colman.

LALloyd Armbrust
Lloyd Armbrustin𝕏FounderLloyd Armbrust is a two-time Y Combinator founder who has previously built a manufacturing business and had three company exits. He is the founder of RonanRx, which provides personalized GLP-1 weight-management care and plans to expand into hormone therapy.
ECEmily Colman
Emily Colmanin𝕏FounderCo-founder and COO of RonanRx, which provides personalized, physician-reviewed GLP-1 weight-management care initiated by text. She is a go-to-market operator with over a decade in healthcare sales, most recently at Eli Lilly.

Investors · 1

Y CombinatorSan Francisco · $500K

Competitors · 4

by search overlap
AgelessRx4 shared keywords
Walgreens4 shared keywordsWalgreens operates a pharmacy and retail health and wellness business, offering prescription services, over-the-counter medications, health products, and photo services to consumers.
Redsail Technologies4 shared keywordsRedSail Technologies develops pharmacy management software and clinical programs for community, long-term care, outpatient, and pharma customers. Its integrated tools aim to improve patient engagement, medication adherence, and health outcomes in the pharmacy industry.
Arrive Health4 shared keywordsArrive Health provides technology that surfaces real-time, patient-specific clinical, cost, and coverage data within electronic health record (EHR) and clinical workflows, helping providers and patients understand out-of-pocket treatment costs and make care decisions. It serves healthcare providers, care teams, and patients in the United States, and is now part of Interra Health.

Companies competing with RonanRx Inc. for the same Google search keywords, organic and paid, via search-intersection analysis.

In the news

RonanRX: We use AI to personalize peptides to your biologyycombinator.com · Jul 2026

Frequently asked questions

What does RonanRx Inc. do?
RonanRx offers personalized GLP-1 weight-management care delivered via text, where a licensed physician reviews a patient's history to set an individualized dose, titration schedule, and patient-specific adjunct, and a licensed pharmacist at the patient's selected pharmacy verifies and releases compounded, patient-specific prescriptions. It serves individual patients in the US (availability varies by state) and plans to add hormone therapy (HRT).
Who founded RonanRx Inc.?
RonanRx Inc. was founded by Lloyd Armbrust, Emily Colman in 2026.
Who are RonanRx Inc.'s investors?
RonanRx Inc.'s investors include Y Combinator.
Where is RonanRx Inc. headquartered?
RonanRx Inc. is headquartered in San Francisco, US.