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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...
Dilantin (phenytoin) is an anti-epileptic drug, also called an anticonvulsant. It works by slowing down impulses in the brain that cause seizures. Dilantin is used to control seizures. Phenytoin does not treat all types of seizures, and your doctor will determine if it is the right medicine for you.