I read a post a few months back from a member who had been given Singulair by her doctor and it really helped with her ulcers. I had been taking Zyrtec for allergies so my doctor let me switch to the Singulair to give it a try since it also helps with seasonal allergies. I also started a zinc & echinacea lozenge (for immune defense) around the same time and miracle of miracles... My frequent, almost constant ulcers became almost non-existent! Thanks again to whoever posted her experience, maybe this combo I'm using will help others! Let me know if you have questions!