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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...
1 Therapeutic drug levels should be maintained between 20 to 30 mg/ml. 2  Rapid dilantin administration can cause cardiac arrhythmias. 3  Dilantin should be mixed in dextrose in water before administration. 4  Dilantin should be administered through an IV catheter in the clientâs hand.