I don't know that I have had notable experience with that particular wormer. I haven't kept real close track of when I've given each one. I have always watched for colic after worming but never had too much trouble.
Good morning!
I really like it, even with this problem. There is such, IMO:), a big change in their coat afterit, bigger then with the other brands, that I feel it must really really clean them out.
I've used it on so many different horses, and seen the same result, that I really don't think it's just my imagination.
Becky