[Regulatory] 503A vs 503B in one paragraph, because everyone conflates them
503A vs 503B in one paragraph, because everyone conflates them — a position I have arrived at slowly and would like tested.
Asked for the beyond-use date basis and got a real answer with a stability reference attached. Not universal, apparently.
Kept the label from every vial. When the shortage status changed, having the paper trail made the conversation much shorter.
Paid noticeably more at one clinic than another for what turned out to be the same facility behind both.
Ask me anything specific. Anything general I will probably get wrong.
best — the order this archive was captured in
Compounded preparations are not approved products and carry no bioequivalence claim. That is a statement about regulatory category, not about quality.
Correction: patient-specific refers to the prescription, not to a bespoke formulation. Common misreading and it changes the argument.
a 503B has to register and report, so there is a paper trail to ask for
What is the beyond-use date and what is it based on?
This. Compounded preparations carry no equivalence claim, and treating them as generics is a category error people make constantly.
Switched between two compounded preparations and the concentration on the label was different. Redid the arithmetic on paper before drawing anything.
Right, and the concentration genuinely can differ from the branded product, which breaks people’s arithmetic.
Push back: "compounded is fine because a pharmacy made it" skips every question this board exists to ask.
compounded is not generic, there is no equivalence claim
the label on a compounded vial is a legal document, read it
ask which facility, then ask for their testing
Was there potency testing on the finished preparation, or only on the starting material?
Yes — asking which facility, by name, is the single most useful question and most clinics will answer it.
- 1Compounded preparations are not approved products and carry no…6 comments in this branch · started by u/formulary_fighter