Mapping a rotation that you will actually follow
The evidence base here is the insulin injection-technique literature, which is large and transfers well on tissue questions.
Reconstitution
Page 3 of 12 of this archive, newest first.
The retest date and the expiry date are not the same document
What would make a difference is not a regulator. It is three lines on a certificate, all of which are already known to whoever wrote it.
What the four services actually offer, test by test
Endotoxin is the more tractable of the two questions, and a kinetic chromogenic determination is neither slow nor exotic. It is simply not on the menu.
The cleanroom grade nobody names on the paperwork
The compendial sterility test cannot demonstrate that a batch is sterile. It can only fail a batch that is grossly contaminated. Everything else is process validation.
Why a dead-clean sterile filter can pass pyrogen straight through
Bacterial endotoxin is a heat-stable lipopolysaccharide from the outer membrane of Gram-negative organisms. It survives sterilisation, passes a sterilising filter, and is…
The pyrogen question has a price, and it is not the price of a purity run
A compendial sterility test takes fourteen days of incubation and consumes the containers tested. That timescale is incompatible with the business model that made…
Endotoxin is not a microorganism, and killing the bacteria does not remove it
The masking phenomenon known as low endotoxin recovery means a formulation can return a clean result while containing endotoxin the assay cannot see.
In-use periods, and the ones nobody can give you
A needle blunts on first use. Reuse is uncomfortable, and it is a documented contributor to lipohypertrophy.
Adsorption, and the dose that stayed on the glass
An in-use period is established by a dedicated study on a specific formulation in a specific container at a specific concentration. Borrowing one from a marketed product is…
How a correct calculation becomes a wrong dose
A pharmacist catches most of these in licensed practice. In this market there is no pharmacist, so the checks have to be structural.
Sterility is not a percentage, which is the whole difficulty
Every certificate circulating in this market answers a question about molecules. Almost none answers a question about organisms, pyrogens, or the integrity of the seal.
The four testing services and the study none of them can run
We asked twenty companies three questions about stability data and print every answer, refusal and non-response.
Mean kinetic temperature is not the average temperature
The compendial definitions of cold, controlled cold and controlled room temperature permit specified excursions, and knowing the permitted band is the difference between an…
What we asked twenty suppliers about stability data
Storage instructions in this market are close to uniform and almost never accompanied by the study that would justify them. Uniformity is a sign of convention, not of…
LAL, kinetic chromogenic, recombinant factor C: three ways to the same figure
The masking phenomenon known as low endotoxin recovery means a formulation can return a clean result while containing endotoxin the assay cannot see.
Freezing a reconstituted vial: the ice-water interface problem
Bacteriostatic water contains benzyl alcohol at 0.9 per cent, which inhibits microbial growth in a preserved multiple-dose presentation. It does not sterilise a contaminated…
Storage after reconstitution, and the evidence behind the numbers
The air shot before a pen injection removes air from the cartridge and confirms flow. Skipping it can mean a materially reduced dose, and it is skipped constantly.
Container closure integrity, and the tests that actually probe it
A sterile product is sterile only for as long as its container closure system excludes the outside world. Integrity is testable, and the tests are cheap by the standards of…
What Medutest charges to answer the pyrogen question
The masking phenomenon known as low endotoxin recovery means a formulation can return a clean result while containing endotoxin the assay cannot see.
What Medutest charges to answer the pyrogen question
The masking phenomenon known as low endotoxin recovery means a formulation can return a clean result while containing endotoxin the assay cannot see.