647
OBJECTIVE : To report a case of serotonin syndrome associated with interaction between fentanyl and citalopram , as evidenced by medication history , clinical features and reversal following discontinuation of fentanyl .
 adverse effect: serotonin syndrome, citalopram; adverse effect: serotonin syndrome, fentanyl; adverse effect: serotonin syndrome, fentanyl
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
 Entity Pairs:  serotonin syndrome, citalopram; serotonin syndrome, fentanyl; serotonin syndrome, fentanyl 
Answer:
 adverse effect: serotonin syndrome, citalopram; adverse effect: serotonin syndrome, fentanyl; adverse effect: serotonin syndrome, fentanyl