Is there a role for medications, beyond treatment for concomitant psychiatric disorders, in the management of pediatric amplified musculoskeletal pain syndrome?  

Having been trained by Dr. David Dan Sherry, my answer would be, "no". Using medicines might make the clinician or the patient/family feel better, but they do not work. Medicinal therapy also takes the focus off the 2 required pathways for optimal treatment, namely aerobic exercise (lots of it) and ...