DanielChem_CHI said:The shortage clause is the answer to the second question and it is a subtraction rather than an addition.
Pushing back on DanielChem_CHI here. A research-chemical supplier selling lyophilised powder labelled research use only is not compounding and is not claiming to. It is a different legal universe with no pharmacy oversight, no patient relationship and no content guarantee, and conflating the two in these threads helps nobody.
Dr.ObesityLA said:Two pharmacies quoted me last year, one describing itself as 503A and one as 503B, and I assumed 503B just meant bigger until both stopped within…
503A vs 503B compounding pharmacies for compounded supply — this distinction matters enormously:
| Feature | 503A | 503B |
|---|---|---|
| Regulation | State Board of Pharmacy | FDA-registered |
| Prescription | Required (patient-specific) | Can compound without patient Rx |
| Testing | Varies by state | cGMP required |
| Scale | Small batches | Larger production |
| Quality consistency | Variable | Generally higher |
I strongly recommend 503B facilities. The FDA oversight and cGMP requirements mean more consistent product quality.
TirzTom said:A research-chemical supplier selling lyophilised powder labelled research use only is not compounding and is not claiming to.
GMP compliance checklist relevant to compounded supply compounding quality:
- Clean room environment with HEPA filtration
- Environmental monitoring (viable and non-viable)
- Personnel training and competency assessment
- Validated analytical methods for testing
- Stability testing program
- Complete batch records and traceability
- Quality management system with deviation handling
A 503B pharmacy following cGMP should be able to answer questions about ALL of these if you ask. Don't be afraid to ask — it's your health.
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Browse GL BiochemOne thing that is still open after tom_AK’s answer:
Why a shortage listing created a legal pathway at all, since a shortage is a supply fact rather than a permission?
Closing the loop on my own question.
The bulks-list asymmetry was the piece I had missed entirely. It explains why one of my two pharmacies is still arguing it can supply and the other simply stopped.