I was told by the pharmacy that supplied me Spontan and the doctor that prescribed me Spontan that no other company has been able to stop the drug crystallizing in the bottle. I've also heard this from the CEO and a stockbroker. I don't recall if it was in one of his interviews or at an investor lunch I attended last year.
As you would expect, Pfizer is not going to provide reasons publicly as to why they don't proceed with some drugs/delivery pathways
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(20min delay)