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503B outsourcing facility

An FDA-registered compounding facility that can make larger batches under CGMP standards and FDA inspection — a step above 503A, but still not an FDA-approved manufactured drug.

By the glp1.how editorial teamReviewed

A 503B outsourcing facility is a compounder that registers with the FDA under Section 503B of the federal Food, Drug, and Cosmetic Act. Unlike a 503A pharmacy, it can produce larger batches without an individual prescription and must follow Current Good Manufacturing Practice (CGMP) standards and submit to FDA inspection.

This adds a layer of oversight above traditional 503A compounding, but a 503B product is still not the same as an FDA-approved manufactured drug: it has not gone through the FDA's review of safety and effectiveness for a specific product. Knowing whether a compounded medication comes from a 503A pharmacy or a 503B facility can help when weighing quality and risk with a prescriber.

The FDA's page for outsourcing facilities (external link) describes the registration, CGMP and inspection requirements.

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Revision history

Updated 1 time since Jul 18, 2026 · show changes
  1. v2

    Body revised

  2. v1

    Change tracking began

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Related terms

  • GMP (Good Manufacturing Practice) · A regulatory standard ensuring medications are consistently produced and controlled to quality standards — a key marker of legitimacy for compounded or manufactured drugs.
  • 503A compounding · A section of federal law that lets a licensed pharmacy compound a medication for an individual patient's prescription, outside the FDA approval process.
  • Effectiveness · How well a medication performs in everyday, real-world use, as opposed to the controlled conditions of a clinical trial.

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