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The FK 506 dose was constant within 21 days after discontinuing phenytoin in Patient 1 who had 36 days of phenytoin therapy.
 Patient 1: Subject; 1: Subject.Population; The FK 506 dose was constant within 21 days: Effect; phenytoin: Treatment; phenytoin: Treatment.Drug; phenytoin therapy: Treatment.Drug; 36 days: Treatment.Time_elapsed
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: adverse event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Subject.Disorder, Treatment.Route, Subject.Race, Treatment.Time_elapsed, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 Patient 1: Subject; 1: Subject.Population; The FK 506 dose was constant within 21 days: Effect; phenytoin: Treatment; phenytoin: Treatment.Drug; phenytoin therapy: Treatment.Drug; 36 days: Treatment.Time_elapsed