Step 1: find the dispensing pharmacy
Your prescription label must name the pharmacy that dispensed it. If a seller will not tell you which pharmacy prepares the product, treat that as a warning sign.
Step 2: check the license
Each state runs its own board of pharmacy with a public license lookup. The National Association of Boards of Pharmacy keeps a directory of every state board. Check the license in the pharmacy’s home state and, if it ships to you from elsewhere, in your state: most states require an out-of-state (nonresident) pharmacy license to ship to their residents. Note the license status, expiry date and any disciplinary actions listed.
Step 3: know what 503A means
A 503A pharmacy compounds medications for individual patients with a prescription, under state oversight. That is different from a 503B outsourcing facility, which registers with FDA and follows federal manufacturing standards. Neither makes the product FDA-approved.
Step 4: ask a few direct questions
- Is this preparation compounded under USP <797> sterile standards?
- Where does the active ingredient come from, and is it from an FDA-registered supplier?
- What testing is done on the finished preparation (for example sterility, endotoxin, potency), and can I see results for my lot?
- What beyond-use date and storage instructions apply?
A good pharmacy will answer plainly. See also FDA’s BeSafeRx guidance on buying medicine online.