The instruction that should be included by the nurse is: There is the potential of decreased effectiveness of birth control pills while taking phenytoin.
This refers to the set of actions that a person needs to take based on clearly defined information.
Hence, we can see that with the administration of phenytoin to a patient, the nurse in charge needs to make a discharge teaching plan for the patient and tell the person the potential of decreased effectiveness of birth control pills while taking phenytoin.
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