The way we used to fix colic was to throw them in the trailer and drive down the bumpiest road we could find. That worked every time.
Now we use 'Silver Lining Herbs', the product ia called 'colic ease'... It's herbal and you mix it with water. It makes this really slimmy stuff. We kind of force feed a little to them and in 20 minutes, no more colic. We even had a horse pass a plastic bag with the stuff.
I don't work for them or sell the product, just love it. Talk to the owner Mickey Young and tell 'em Bret Wade from Colorado sent you...