guys from what i understand the best proportion of hydro to apap for the best results are the 10/500.if you read in chemical review a pharmacy online mag they state this.for some reason that combo when apap gets to liver and is broken down produces a more synergestic effect on the hydro with the blood brain barrier.
also was stated that generics are only required to meet a 75 percent match of active meds as opposed to brand.some generice are above by 25% and other labs are below.thats probably why watson makes the best generics in all the meds because they go above.