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Tricyclic antidepressants are often effective for the management of persistent pain, and several neurochemical mechanisms have been proposed. The purpose of the present study was to examine the effect of amitriptyline (AMI) in two animal models of inflammatory pain, the formalin test and the bee venom test, and to ascertain the effect of naloxone on amitriptyline analgesia. A single dose of AMI (20...