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Oxycodone-gabapentin also significantly improved pain relief vs gabapentin alone (P = 0.003).
 Oxycodone-gabapentin: Treatment; pain: Treatment.Disorder; Oxycodone: Treatment.Drug; gabapentin: Treatment.Drug; Oxycodone: Combination.Drug; gabapentin: 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:
 Oxycodone-gabapentin: Treatment; pain: Treatment.Disorder; Oxycodone: Treatment.Drug; gabapentin: Treatment.Drug; Oxycodone: Combination.Drug; gabapentin: Combination.Drug