Hi bluelighters thank you for reading this! I have always used pms hydromorphone (pharmascience) and recently I filled a prescription for it and got apo brand. it says apo on one side h4 on the other I am very worried these generics do not compare evenly as I have had problems switching brands with drugs in the past . If anyone here has experience with these two drugs or even the apo version please let me know your experience. Just worried I'm going to have to go 2 months on a script that just blows as I'm sure many people here have had that experience ( and I can't judge off one test ). Living in pain sucks and not getting the proper meds sucks just as bad. Thank you to anyone who contributes and my prayers to all those who live the life of pain like me.