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SSRIs and fentanyl are commonly co-administered, especially in the setting of chronic or malignant pain, as underlying depression may contribute to the pathogenesis of pain.
 SSRIs and fentanyl are commonly co-administered: Treatment; chronic or malignant pain: Treatment.Disorder; underlying depression: Treatment.Disorder; SSRIs: Treatment.Drug; fentanyl: Treatment.Drug; SSRIs: Combination.Drug; fentanyl: 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: potential therapeutic event 
  Option: Treatment.Freq, Subject.Population, Combination.Drug, Subject.Gender, Treatment.Duration, Subject, Effect, Treatment, Treatment.Disorder, Treatment.Time_elapsed, Subject.Disorder, Subject.Race, Treatment.Route, Treatment.Dosage, Subject.Age, Treatment.Drug 
Text: {0} 
Answer:
 SSRIs and fentanyl are commonly co-administered: Treatment; chronic or malignant pain: Treatment.Disorder; underlying depression: Treatment.Disorder; SSRIs: Treatment.Drug; fentanyl: Treatment.Drug; SSRIs: Combination.Drug; fentanyl: Combination.Drug