The 5/500 vicodin has ......5mg hydrocodone/500mg acetaminophen (tylenol)
The 7.5/660 vicodin has..7.5mg hydrocodone/660mg acetaminophen (tylenol)
Basically, you receive
2.5mg more of
narcotic pain reliever along with
160mg more of
tylenol. So, that may also account for a bit more relief besides the hydro. But be careful.....too much tylenol daily can cause damage to your organs. One thing you can ask your dr if you ever want to decrease the amount of tylenol to 325mg.....ask him/her if NORCO comes in your current dosage of 7.5mg hydro. I think I have read that it comes in as little dosage as 2.5mg up to 10mg. This is of course the hydrocodone amount in it.
Take care......Kitt