803
Of the 15 patients treated with tizanidine and mexiletine, 4 suffered tizanidine-induced adverse effects such as drowsiness and dry mouth in the retrospective survey.
 15 patients: Subject; 4: Subject; 15: Subject.Population; drowsiness and dry mouth: Effect; tizanidine and mexiletine: Treatment; tizanidine: Treatment.Drug; mexiletine: Treatment.Drug; tizanidine: Treatment.Drug; tizanidine: Combination.Drug; mexiletine: Combination.Drug
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:
 15 patients: Subject; 4: Subject; 15: Subject.Population; drowsiness and dry mouth: Effect; tizanidine and mexiletine: Treatment; tizanidine: Treatment.Drug; mexiletine: Treatment.Drug; tizanidine: Treatment.Drug; tizanidine: Combination.Drug; mexiletine: Combination.Drug