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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...
Examples of barbiturates available in the US include: 1  amobarbital (Amytal) 2  butabarbital (Butisol) 3  pentobarbital (Nembutal)  secobarbital 1  (Seconal) belladonna and phenobarbital (Donnatal)  butalbital/acetaminophen/caffeine (Esgic, 1  Fioricet) butalbital/aspirin/caffeine (Fiorinal Ascomp, Fortabs)