Compounding 101
What Is a Compounding Pharmacy?
A compounding pharmacy is a licensed pharmacy that prepares customized medications to fit an individual patient's prescription — adjusting the strength, dosage form, or ingredients in ways mass-manufactured drugs can't. Compounding is used when a commercial product doesn't work for a patient: a different strength, a liquid instead of a pill, an allergen-free version, or a combination of medications. In the U.S., compounding is performed under two regulatory categories — 503A pharmacies (patient-specific prescriptions) and 503B outsourcing facilities (larger-batch) — and follows United States Pharmacopeia (USP) quality standards.
Key takeaways
- Compounding = custom-made medication prepared per prescription, not off-the-shelf.
- Common reasons: custom strength, alternative form (liquid, cream, troche), allergen-free base, combined ingredients, or discontinued products.
- Two categories: 503A (traditional, patient-specific) and 503B (outsourcing facilities, bulk).
- Quality is governed by USP chapters <795> (non-sterile), <797> (sterile), and <800> (hazardous drugs).
- Compounded preparations are not FDA-approved and always require a valid prescription.
What compounding pharmacies do
Traditional drug manufacturing makes one product in fixed strengths for the mass market. Compounding works the opposite way: a pharmacist prepares a medication to match what a specific patient needs, exactly as their provider prescribes. That might mean a precise strength between commercial doses, a capsule made without a dye or filler the patient reacts to, a flavored liquid for someone who can't swallow tablets, or two medications combined into a single preparation.
Because each preparation is made to order, compounding gives prescribers flexibility that commercial products can't. It is widely used in hormone therapy, weight management, dermatology, pediatrics, pain management, sexual health, and veterinary medicine.
When is compounding used?
Providers turn to compounding when an FDA-approved product doesn't fit a patient's situation. Common scenarios include:
- A needed strength isn't manufactured commercially.
- The patient is allergic or sensitive to a dye, preservative, or filler in the commercial product.
- The patient can't take the available form (e.g., needs a liquid, topical, or troche instead of a tablet).
- A commercial medication has been discontinued or is in shortage.
- Multiple medications can be combined to simplify a regimen.
503A vs. 503B: the two regulatory categories
U.S. compounding falls under Sections 503A and 503B of the Federal Food, Drug, and Cosmetic Act. 503A pharmacies compound for an identified patient based on a prescription and are regulated primarily by state boards of pharmacy. 503B outsourcing facilities can compound larger batches without a patient-specific prescription, register with the FDA, and must follow current Good Manufacturing Practice (cGMP).
| 503A pharmacy | 503B outsourcing facility | |
|---|---|---|
| Prescription | Patient-specific required | Not always required (bulk) |
| Primary oversight | State boards of pharmacy | FDA (cGMP) + registration |
| Typical use | Individual patient prescriptions | Office/clinic stock, larger volumes |
| FDA-approved drugs? | No (compounded) | No (compounded) |
Quality and safety standards
Reputable compounding pharmacies follow USP standards: <795> for non-sterile preparations (capsules, creams, oral liquids), <797> for sterile preparations (injectables, ophthalmics) made in cleanroom environments, and <800> for safely handling hazardous drugs. Third-party potency and sterility testing, accreditation (such as NABP), and certifications (such as LegitScript) are additional signals of a quality compounding operation.
How Logos RX fits in
Logos RX is a 503A compounding pharmacy in Tampa, Florida, operating both sterile and non-sterile labs and licensed in 25 U.S. jurisdictions. Providers prescribe through our portal; we compound the preparation to specification and ship it nationwide within our licensed states. Every medication is made to order against a valid prescription.
Frequently asked questions
Are compounded medications FDA-approved?
No. Compounded preparations are not FDA-approved. They are prepared by licensed pharmacies to a prescriber's specification and follow USP quality standards, but they do not go through the FDA new-drug approval process.
Do I need a prescription for compounded medication?
Yes. All compounded medications require a valid prescription from a licensed healthcare provider.
Is compounding safe?
When performed by a licensed pharmacy following USP <795>/<797>/<800> standards with appropriate testing and accreditation, compounding is a well-established practice. Ask whether a pharmacy is state-licensed, accredited, and tests its preparations.
Related reading
Work with a 503A compounding pharmacy
Logos RX compounds personalized medications in Tampa and ships nationwide within our licensed states. Providers can prescribe through our portal.
Educational content. Compounded medications are not FDA-approved and require a prescription. Last reviewed June 2026.