lyndacarol wrote:
Thanks, NHE, for correcting my memory about the ingredients in Avonex. If not Avonex, doesn't one of the CRAB drugs contain a sugar? Or has my memory gotten so bad?
To be fair, I should have also included the ingredients for the prefilled syringes since many people now use those.
Quote:
30 mcg Prefilled Syringe:
A prefilled syringe of AVONEX ® is formulated as a sterile liquid for intramuscular injection. Each 0.5 mL (30 mcg dose) of AVONEX ® in a prefilled glass syringe contains 30 mcg of Interferon beta-1a, 0.79 mg Sodium Acetate Trihydrate, USP; 0.25 mg Glacial Acetic Acid,ഊUSP; 15.8 mg Arginine Hydrochloride, USP; and 0.025 mg Polysorbate 20 in Water for Injection, USP at a pH of approximately 4.8.
It does contain 25 micrograms of
Polysorbate 20. But the structure of this molecule doesn't even look close to any sugar or starch. Even if it was metabolized to the 5 member ring which sort of resembles a sugar, the low levels at 25 micrograms would not likely be significant.* It's presence is likely just to stabilize the Inf-B in solution.
NHE
* If we make an assumption about how a polysorbate 20 molecule might be metabolized such that the ether bonds surrounding the 5 member ring are hydrolized to hydroxyl groups, then the amount of "sugar-like" molecule would be reduced to 3.34 micrograms since the resultant molecular weight (164.18 g/mol) would be just 13.37% of the parent molecule's molecular weight (1227.54 g/mol).