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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...
â Only your doctor can recommend changing your medication. When a change in the dosage form or. brand is prescribed, careful monitoring of phenytoin serum levels should be carried out by your doctor. DILANTIN is available in 30-mg and 100-mg capsules. Do not take DILANTIN if you are allergic to phenytoin or its inactive ingredients or other anticonvulsants such as CEREBYX (fosphenytoin), PEGANONE (ethotoin), or MESANTOIN (mephenytoin).