Hi Hanna, My doc gave me a few samples of Nulev that dissolve under the tongue. I was nervous to try it because I took Bentyl and it made me crazy dizzy and nauseas. I did take the Nulev and it did help stop the diarrhea. I don't recall getting tired or anything. For me, it seems to help faster than Imodium because of the quick dissolving factor. You might want to give it a try...good luck if you do.