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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...
The main differences among barbiturates are their half-lives (duration of their effects). Drugs such as secobarbital sodium and pentobarbital sodium are short-acting, while others such as amobarbital sodium and butabarbital sodium are intermediate-acting, and phenobarbital and mephobarbital are long-acting. Examples of barbiturates: 1  Nembutal (phenobarbital). 2  Mebaral (mephobarbital).