Ivy_bitch said:"Dextropropoxyphene hydrochloride is a white or almost white odourless crystalline powder. It is very soluble in water, freely soluble in alcohol, soluble in acetone and chloroform, practically insoluble in ether. Store in an airtight container. Protect from sunlight."
From: http://www.medsafe.govt.nz/profs/Datasheet/c/Capadexcap.htm
Since propoxyphene is a pretty good local anesthetic, you can feel a slight numbness in your mouth when you drink the solution.
The consensus seems to be that people prefer tramadol. Maybe I prefer propoxyphene because my tramadol tolerance is high. I somehow doubt this to be the case, however, since there is likely to be some cross-tolerance between these two.
Wish I had real opiates
The active in Darvocet is Propoxyphene Napthylate or whatever, not the HCl salt. Not soluable.