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Dr. Castellanos is an Associate Professor in the Department of Anesthesiology at the UC San Diego School of Medicine. He also serves as Medical Director of Inpatient Rehabilitation. Dr. Castellanos has specific clinical interests in pelvic pain, complex regional pain syndrome, phantom limb pain and post-spinal cord injury pain syndromes. His research interests include altering nutrition as a means of treating chronic pain, neuromodulation for chronic painful conditions and the potential use of psychedelics for these conditions.

Dr. Castellanos completed residency training in physical medicine and rehabilitation at University of Michigan Medical School, where he also completed a two-year program in healthcare administration. Dr. Castellanos earned his medical degree from University of Toledo College of Medicine in Ohio. He is board-certified in physical medicine and rehabilitation and pain medicine.