It is not needed for a long period as the intestinal bacteria will grow back naturally if you start eating healthy food (freshly prepared homemade food - if possible use organic /natural food ). It takes consistency in following a healthy lifestyle. About intestinal bacteria, and how healthy food habits and routine lifestyle changes can help overcome digestive problems.
Yes, you can, but it has its side effects. Please talk to the doctor who is treating your mother about this. I cannot give such an advice without seeing the patient.
Having issues? Consult a doctor for medical advice