I've used a lot of Lomotil over the years. It can be habituating, and I suppose can also lose some of its effect, but I have found that using it regularly but as seldom as possible, it still works fine for me after 15 years. I would use it daily in tense situations, up to 3 at a time, particularly as a protection (in advance of an important time, rather than as a treatment for D.) It also works fine for D, but may take 30-40 min. to work, even if chewed. The only side effects I ever minded was the slight drowsiness I might get from 3. The dry mouth isn't too bad, and comes from the tiny amount of atropine they put in it to discourage abusive overdosing.