I'm not sure of the equivalents. But I know i've read in different studies, and it is mentioned in my pill prescription book that many people OD on Darvacet/Darvon. It's says because they don't feel a full ephoric (spelling) effect that they keep taking more and more. I've only had Darvon and it made me sick so my Doctor switched my pain meds so I don't know very much about this.