I don't know the answer to your question, but my mare just had Tildren yesterday and I was concerned about colic from it. I started her on Ulcergard for a week before and will continue for a few days after, I also told my vet to give her banamine before running the Tildren just as a precaution. She was fine during and so far after ( not quite 24 hours later). I believe the colic issue is just while the Tildren is running in. My thoughts were be proactive that is why I did the Ulcergard.
If my horse were ulcer prone, I would probably do the Ulcergard or Gastrogard for a little longer after the treatment.
What has your vet suggested? Mine did not say to do anything beforehand, but when I told him I was going to do the Ulcergard he thought that was a fine idea...I guess no one had ever asked him about doing anything beforehand to make it easier on the horse.
I'm not questioning you or your vet, but was the Tildren run in slowly? I think that may have something to do with the colic issue. My vet used human IV tubing to insure it went in slowly. Just a thought.