When should I call my doctor if I am taking Dificid?

If you're taking Dificid (fidaxomicin) to treat diarrhea caused by the bacterium Clostridium difficile, you should call your doctor if your diarrhea does not start to get better within a few days. And because Dificid can cause serious side effects, you also should let your doctor know if you experience any of these symptoms: weakness, fatigue, dizziness, headache, shortness of breath, chest pain, a fast, pounding heartbeat, pale skin, cold hands and feet, stomach cramps, bright red blood in vomit, vomit that looks like coffee grounds, black tar-like stools, bright red stools or a fever, sore throat, chills or other signs of infection. Signs of a serious allergic reaction include trouble breathing, itching and swelling of the face, mouth or throat.