Also give some thought to what could have caused this colic episode. Evaluate the horse's physical status first, and record your findings.
Circulatory compromise needs veterinary attention.
Use only the recommended drugs and dosages. Do not combine drugs. Do not give repeated doses. The goal is to relieve pain while monitoring the horse's condition for improvement or deterioration. Be very cautious about giving drugs that may affect your or the vet's ability to accurately assess the horse's condition.