Or know what's in it?
I was on a couple of versions of extended release morphine
, first Avinza, and then Kadian, with moderate impact. My PM doctor suggested that because the system gets used to a drug, its effectiveness can decline over time, thus requiring more of the med to accomplish the same result. He suggested that a change of meds might help, and started me on Opana, which he described as "more potent" than morphine.