How is a beyond-use date set for compounded survodutide in sterile water for injection?

What I have: survodutide · sterile water for injection.

I have done this once and I suspect I got away with it rather than got it right.

For context: I keep records of every batch, every lot number and every result, so an answer that requires me to track something is fine.

What would you do, and what would you check afterwards?

Concretely, the relevant distinction is between compounding for an individual patient and compounding at scale, which are regulated differently.

Beyond-use dates on compounded sterile preparations are set by standards that depend on the preparation environment and are much shorter than a manufactured product's shelf life.

Compounding is the preparation of a medicine for an individual patient in response to a prescription, where an approved product is unsuitable. It sits outside the approval framework by design rather than by omission.

Compounding is defined in regulation as preparation for an individual patient under prescription and is distinguished from manufacturing by scale and by the patient-specific requirement.

Ask for the certificate of analysis on the lot. A serious facility has one.

Answering this needs the jurisdiction, since the framework differs substantially between countries and even between states.

Salt forms matter: a compounded preparation using a different salt from the approved product is not the same active moiety, and that has been the specific object of regulatory warnings.

Ask for the certificate of analysis on the compounded lot. A serious facility will have one; the request itself is informative.

Beyond-use dating for compounded sterile preparations is governed by published standards keyed to the compounding environment.

The framework is jurisdiction-specific. Check yours rather than a general answer.

The short version: legitimate under a prescription within defined limits, unapproved by definition, and quality depends entirely on the facility.

Facility quality varies enormously and is the practical determinant of what you receive. The relevant questions are about sterility assurance, potency testing and beyond-use dating.

Facility quality is the dominant variable and cannot be assessed from a website.

Check the beyond-use date and what it was based on.

The part that matters: salt forms and additives are the usual point of divergence and are worth asking about specifically.

Additives are the other divergence. Preparations combining an active with vitamins or other agents are not equivalent to the approved product and have not been studied in that combination.

Regulatory warnings have specifically addressed salt forms differing from the approved active moiety in this therapeutic area.

Compounded means unapproved by definition. That is structural, not pejorative.