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0. Phenobarbital is a barbiturate and will cause a positive test result for barbiturates. Phenytoin (Dilantin) is not a barbiturate; however a metabolite, p-hydroxyphenytoin has minimal cross reactivity on the initial screening test. There is no interfe.... Phenobarbital is a barbiturate and will cause a positive test result for barbiturates. Phenytoin (Dilantin) is not a barbiturate; however a metabolite, p-hydroxyphenytoin has minimal cross reactivity on the initial screening test. There is no interfe...
Butalbital is a barbiturate and acetaminophen is the active ingredient in Tylenol. It is approved for the treatment of tension headaches and muscle contraction headaches. Vicodin (hydrocodone and acetaminophen) is a powerful opioid painkiller approved to relieve moderate to severe pain.