Im on 80mg daily of methadone and took 2 Fioricet,that were given to me for a headache. After eating a couple hours later it seemed as if i had taken a larger dose of methadone. It would seem it was the fioricet that caused this ,but everything that ive read said that fioricet will decrease methadone not increase it.I would like to find out the facts,and not guess.Thanks for your time with this question.