Does phenidone "go bad" on the shelf? I have kept mine in the same plastic bottle in which the Formulary shipped it to me. It is a bit caked--the stuff has the consistency of powdered sugar, tends to cling to itself as if slightly "greasy", and I think is a a very pale yellow (not in front of me at present.) Reason I ask--I had some problems (gross underdevelopment, no other obvious cause) with a recent batch of mytol, and wondered, of its components, which was the most likely to be at fault. I've tried making up a phenidone stock solution in 100mL of propylene glycol, but it did not dissolve welll. Now I have a waxy mess with a bit of PG left in the bottle, kinda like the comb in the jar of honey! Thanks all.