My son has UP. His gastro doctor has never discussed upgrading from a pill (Lialda) to a foam application.
Lialda is OK but nothing to write home about.
I've said it before, the notion of 42 enemas for relief, I won't do. But for a cure, where relief is the minimum, he would do.
Sorry, I can help answer the liquid vs. foam part of your post.
Paul