Keep in mind there is a difference between Darvocet and Darvocet-Ns. I know the 100mg Propoxyphene - 650mg APAP
pink pills are Darvocet-N, so they have Propoxyphene Napsylate as opposed to Propoxphene hydrochloride, which means that a 100mg pill is actually 65mg if you think of it in conventional terms (Propoxy hcl). Not accounting for the difference between the forms of propoxyphene may be part of the reason why some people get very little (they think they are taking a higher dose than they are), not to mention the conflicting dose levels I have seen listed in experience reports on the internet, though most of those don't account for opiate
tolerance or lack thereof so I can't say for sure.
Please be sure to list which drug
you are specifically referring to in a post, propoxyphene napsylate or propoxyphene hydrochloride, as 300mg of Darvocet-N does not equal 300mg of regular Darvocet, and a person who fails to make the distinction when choosing a dose could make a dangerous mistake.
Also, I think it may be possible to do a cold-water extraction to help get rid of that pesty APAP if you have propoxyphene hydrochloride, as it has greater water solubility, though I am not sure to what extent it is more soluble. This may be a potential experiment for someone who has time and drugs