When I was switched medications from hydro to something else, I continued to take tylenol to help since I stopped taking hydro. It helped with the headaches. Be sure to check for drug interactions or too much actimatiphen first though.
Actually, I think the perc's will more than take care of any withdrawl symptoms from stopping hydro. You should be fine with those for backup. I wish I had a couple of 10/325 perc's right now!!
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And if the band youre in starts playing different tunes....I'll see you on the dark side of the moon