Drug Effectiveness Review Project (DERP) This is a collaboration of public and private organizations developed by Oregon Health and Science University. Provides comparative data on the benefit, side effects, and costs of different prescription drugs. Free. Website: www.ohsu.edu/ohsuedu/research/policycenter/DERP/Email: centerebh@ohsu.eduPhone: 503 494-2182, ORDate Updated: 6/25/2010