Dolorex - The pain eraser. When equine pain strikes, strike back with Dolorex, the veterinary-registered butorphanol solution specifically for horses. Dolorex is an opioid analgesic which is free of morphine-like side-effects. It won’t mask clinical signs of colic, contributing to faster and more accurate diagnoses. Good pain management is always the best medicine. For outstanding control of equine pain, reach for the pain eraser – Dolorex. Prescription Animal Remedy (P.A.R.) Class II. For use only by, in the presence of, or under the control of a veterinarian. | 