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To describe the potential for interaction between opioids and serotonergic antidepressants leading to the development of serotonin syndrome (SS), mechanism of the interaction, and the spectrum of SS in elderly residents of a long-term care facility.
 elderly residents: Subject; elderly: Subject.Age; serotonin syndrome: Effect; opioids: Treatment; serotonergic antidepressants: Treatment; opioids: Treatment.Drug; serotonergic antidepressants: Treatment.Drug; opioids: Combination.Drug; serotonergic antidepressants: 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:
 elderly residents: Subject; elderly: Subject.Age; serotonin syndrome: Effect; opioids: Treatment; serotonergic antidepressants: Treatment; opioids: Treatment.Drug; serotonergic antidepressants: Treatment.Drug; opioids: Combination.Drug; serotonergic antidepressants: Combination.Drug