It is very important that your doctor check your progress to see if the medicine is working properly and to check for unwanted effects.
Call your doctor if your diarrhea does not improve or if it gets worse within 48 hours.
Check with your doctor right away if you develop a fever or have blood in your stool.
Antibacterials, including rifamycin may also cause diarrhea, and in some cases it can be severe. It may occur 2 months or more after you stop using this medicine. Do not take any medicine to treat diarrhea without first checking with your doctor. Diarrhea medicines may make the diarrhea worse or make it last longer. If you have any questions about this or if mild diarrhea continues, or gets worse, check with your doctor.
You can become dehydrated if too much fluid is lost from the body with diarrhea. Make sure you drink plenty of fluids while you have diarrhea. Check with your doctor right away if you have more than one of the following symptoms: decreased urination, dizziness, dry mouth, increased thirst, or lightheadedness.