What science is the BUD section based on? The "Briefing" states this new revision is based on "new science" but there is no documentation, references, etc. which should be available for confirmation by practitioners.
The chapter goes into extensive detail about how:
- to ensure sterility
- to explain the different parameters to be considered
- to explain that both sterility and stability considerations must be taken into account when establishing a BUD
- to present stability considerations (1397-1419)
BUT then states that:
- BUDs for CSPs must be established in accordance with Table 7 for Category 1 CSPs and Table 8 for Category 2 CSPs. (Lines 1421-2)
- BUDs in Table 7 and Table 8 for CSPs are based on the risk of microbial contamination, not the physical or chemical stability of the CSP. (Lines 1425-1431)
- if there is any indication that the particular preparation will not remain chemically or physically stable for the specified period, a shorter BUD must be assigned. (Lines 1432-1436)
- the shorter BUDs in Table 8 for aseptically prepared CSPs that are not sterility tested must not be exceeded. (Lines 1444-1445)
HOWEVER, what is to be done if they ARE sterility tested and are stable? I don't see any provision for going beyond the BUDs in Table 8.
The chapter states that one must "look at ALL issues to assign a BUD; BUT, the chapter shows and states the BUDs only consider "sterility" (with the exception of those CSPs that are not stable).
My Comments:
It does not look like there are any alternatives or flexibility (pharmaceutical judgment). Is this what is really intended? This chapter has a tremendous impact on CSP availability throughout the US (and the world) and needs to be reasonable and effective for patient care.
If a USP <71> sterility assurance level (SAL) of 1 x 10-6 is achieved, a sterile preparation should remain sterile. Where is the science that says it goes from sterile to nonsterile if properly sealed and stored?
- A CSP cannot be sterile on day 28 and suddenly nonsterile on day 29.
- A CSP cannot be sterile on day 42 and suddenly nonsterile on day 43.
Why not a simple statement that if the CSP is improperly stored or the seal becomes challenged, then it should be immediately discarded?
If studies show that a CSP is physically/chemically stable for up to 60 days, 90 days, or even 6 months and it is sterility tested according to USP <71>, is that data of no value? If not, there are hundreds of published studies that may be of little or no value when the chapter becomes official. Does USP <71> adherence mean different things for manufacturers vs compounders? It looks like discrimination in the application of official USP standards.
In summary and sad to say, I don't see any real science behind Tables 7 and 8, just opinions.
As we have stated so often in this Newsletter, "Question Everything" and "Show me the science!"
Loyd V. Allen, Jr., PhD, RPh
Editor-in-Chief
International Journal of Pharmaceutical Compounding
Remington: The Science and Practice of Pharmacy Twenty-second edition
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