My mother in law was prescribed Bactrim to treat sores in her nose. The medication gave her severe diahrea and nausea. The dr. then prescribed Lomotil to stop the diahrea. On "this site", Drugs.com, the info. on Lomotil says "do not take lomotil if your diahrea was caused by an intibiotic! I'm scared for my Mother in law because she blindly trusts her dr. - who is also just human like the rest of us!