To what extent is morhpine stronger than hydrocodone?

Can't answer that ? Without knowing whether you are talking about oral morphine, a sustained release form of morphine, or a morphine injection. Morphine is broken down by stomach enzymes and taken out by the liver after absorption to where very little is actually getting into bloodstream. So, hydrocodone 5 mg is stronger than morphine by mouth. However if given by injection morphine is twice as potent as hydrocodon.