What To Do
Your horse is showing signs of colic pain. If it seems safe to do so, assess their general health using the Whole Horse Exam (WHE) paying particular attention to their attitude, heart rate, mucous membrane appearance, capillary refill time, and gut sounds. Share these findings with your vet when you call them.
Depending on the circumstances, your vet may advise you to treat and monitor your horse yourself or suggest that they examine the horse. If your vet advises you to treat your horse with pain medication, always remove feed and prevent access to feed.
Medications like flunixin meglumine (Banamine®) may mask the signs of colic pain regardless of whether the condition causing the pain is really resolved. This may cause the horse to become hungry again and eat (or want to eat) when they should not.
If your vet advises you to treat the horse yourself, also talk to them about the subtle signs to watch for that might indicate an ongoing problem despite medication, and when to begin feeding the horse again.
What Not To Do
Do not handle a colicy horse if you are not confident you can do it safely.
Do not give your horse any medication (including Banamine®) without first consulting your vet because you may mask signs of illness and delay treatment. Do not give your horse a dose of Banamine®, assume that it has "fixed" the problem, and go to bed. Do not give your horse several doses of Banamine® without veterinary guidance. Additional doses of medication do not necessarily improve pain relief and can cause fatal side effects.
Do not assume that the problem has resolved because your horse has passed manure.
Do not give "colic remedies" or any other treatments or medications without first talking to your vet. Substances containing belladonna paralyze the gut, which can be harmful. These products can help temporarily though, and since 70% of episodes are simple and will resolve on their own without such medications, most horses get better.
Do not insert anything up the rectum or give your horse an enema. The rectum is very fragile and can be torn, a potentially fatal injury.
While walking a horse can be helpful, exercising a horse to exhaustion can worsen the situation and increase stress to the horse.
Do not try to pass a naso-gastric tube yourself.
Do not assume that "colic" is always a simple problem that is simply resolved.