Donlac Tablet is a prescription medicine used in the treatment of diarrhea. This medicine is a probiotic and it works by restoring the balance of good bacteria in the intestine that may get upset after antibiotic use or due to intestinal infections. Donlac Tablet is taken with or without food in a dose and duration as advised by the doctor. You may take this medicine along with oral rehydration solution (ORS) as it will help to provide adequate fluid and electrolyte replacement. The dose you are given will depend on your condition and how you respond to the medicine. You should take this medicine until your doctor tells you to stop. Consult a doctor while taking any other medicine especially steroids or antibiotics along with this medicine. The most common side effects are bloating and flatulence. Most of these are temporary and usually resolve with time. Contact your doctor straight away if you are at all concerned about any of these side effects. Before taking this medicine, you should let your doctor know if you have liver or kidney problems. Pregnant or breastfeeding women should also consult their doctor.