What is a 503A pharmacy?

503A pharmacies compound medications for individual patients based on a valid prescription. These are patient-specific, meaning each compound is made to order for a named individual. They require a prescription for each patient, ship compounds directly to patient or clinic, are ideal for customized dosing and delivery methods, are state-board regulated with USP standards, and operate in all 50 states.

What is the difference between 503A and 503B pharmacies?

503A pharmacies compound patient-specific medications based on individual prescriptions and are state-board regulated with USP standards. 503B facilities are FDA-registered outsourcing facilities that can produce large batches of compounded drugs without patient-specific prescriptions, are federally regulated by the FDA and subject to cGMP standards, and offer bulk ordering for clinic stock with higher consistency and scalability.

Our Solutions / 503A Pharmacy

503A
‍Pharmacies.

We work with 503A licensed compounding pharmacy partners to prepare customized medications to meet your patients' specific needs. Every partner in our network is vetted for compliance, consistency, and the quality of theirformulation work — so you're never working with an unknown vendor.

Patient-specific formulations

All 50 states covered

24-hour turnaround

USP-standard compliant

What We Carry

Customized, patient-specific compounded medications.

We offer a comprehensive portfolio of GLP-1 therapies, peptides, dermatology medications, injectables and topical creams, all formulated with ingredients sourced from trusted, high quality suppliers. Our GLP-1 API's are procured from FDA registered, green listed manufacturers and distributed through licensed wholesalers. Every one of our 503A pharmacy partners is held to rigorous third-party testing requirements. Most of our pharmacies are legit script certified to ensure the highest standards of safety, compliance and consistency.

FDA-registered API

Green-listed manufacturers, distributed through licensed wholesalers.

Third-party tested

Every batch independently verified for purity and potency before release.

Close-up of a microscope focusing on a petri dish with yellow liquid droplets inside a lab.

Close-up of a microscope with a petri dish containing yellow droplets on the stage.

Know the Difference

503A vs 503B — what it means for your practice.

Not all compounding pharmacies are the same. Understanding the distinction helps you source smarter, stay compliant, and serve your patients better.

503A — Patient-Specific

Traditional compounding pharmacies.

503A pharmacies compound medications for individual patients based on avalid prescription. These are patient-specific, meaning each compound ismade to order for a named individual.

Requires a prescription for each patient

Compounds shipped directly to patient or clinic

Ideal for customized dosing and delivery methods

State-board regulated with USP standards

Best for: peptides, HRT, specialty protocols

In all 50 states

503B — Outsourcing Facilities

FDA-registered outsourcing facilities.

503B facilities can produce large batches of compounded drugs without patient-specific prescriptions. They are federally regulated by the FDA and subject to cGMP standards — the same rigor as commercial manufacturers.

No patient-specific prescription required

Bulk ordering available for clinic stock

FDA-registered and cGMP compliant

Higher consistency and scalability

Best for: office-use compounds, bulk, IV solutions

6–12 month BUD's offered

Our Specialty

What we specialize in sourcing from our 503A network.

Medical Weight Loss & GLP-1

Semaglutide, Tirzepatide, Retatrutide, and Orforglipron — injectable and oral formats across multiple concentrations. Patient-specific and bulk office-use options available.

Hormone Therapy (HRT)

Testosterone, Estradiol, Progesterone, DHEA, Anastrozole, Clomiphene, and Thyroid — available in injectable, cream, capsule, and troche form for comprehensive hormone protocols.

Sexual Health

Sildenafil, Tadalafil, PT-141, Oxytocin, and combination formulations — capsule, troche, RDT, nasal spray, and topical options for men's and women's sexual health.

Peptides & Regenerative

BPC-157, TB-500, Tesamorelin, Sermorelin, Selank, Semax, and more — injectable and nasal spray formats across a wide and growing peptide catalog.

How It Works

How VerifiedRx handles this for you

Our 503B partners cover all 50 states with the capacity to handle high-volume clinic stock. We match your practice with the right facility based on your formulary, volume, and turnaround needs — and handle the onboarding so you're ordering bulk stock within 24–48 hours.

Verified sourcing

Every supplier in this category has been vetted for compliance, consistency, and pricing. You're never working with an unknown vendor.

Simplified onboarding

We handle the paperwork, account setup, and introductions. Most providers in this category are ordering within 24–48 hours of their first call.

Ongoing support

Your VerifiedRx rep stays involved. If something changes — pricing, availability, compliance — youhear from us before it becomes a problem.

Let's get your practice set up.

We work with licensed clinics and pharmacies across the country. Whether you're sourcing compounded medications, peptides, supplies, or cGMP Compliant Lab Testings — our team is ready to walk you through what we carry, how we source it, and what fits your practice.

503A ‍Pharmacies.