1041
CASE SUMMARY: A 65-year-old patient chronically treated with the selective serotonin reuptake inhibitor (SSRI) citalopram developed confusion, agitation, tachycardia, tremors, myoclonic jerks and unsteady gait, consistent with serotonin syndrome, following initiation of fentanyl, and all symptoms and signs resolved following discontinuation of fentanyl.
 ( adverse event: developed ,  65-year-old patient: Subject, 65-year-old: Subject.Age, confusion, agitation, tachycardia, tremors, myoclonic jerks and unsteady gait, consistent with serotonin syndrome: Effect, chronically treated with the selective serotonin reuptake inhibitor (SSRI) citalopram: Treatment, following initiation of fentanyl: Treatment, fentanyl: Treatment.Drug, citalopram: Treatment.Drug, chronically: Treatment.Duration, fentanyl: Combination.Drug, citalopram: Combination.Drug) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: developed ,  65-year-old patient: Subject, 65-year-old: Subject.Age, confusion, agitation, tachycardia, tremors, myoclonic jerks and unsteady gait, consistent with serotonin syndrome: Effect, chronically treated with the selective serotonin reuptake inhibitor (SSRI) citalopram: Treatment, following initiation of fentanyl: Treatment, fentanyl: Treatment.Drug, citalopram: Treatment.Drug, chronically: Treatment.Duration, fentanyl: Combination.Drug, citalopram: Combination.Drug) 