Antibiotics disturb the balance of gut bacteria, and some people use probiotics (in supplements or foods like live yoghurt) to help. Research suggests probiotics may lower the chance of antibiotic-associated diarrhoea in some situations, though results vary by product and person.
If you choose to use them, taking the probiotic a couple of hours apart from the antibiotic is a common approach. They are not a substitute for taking your antibiotic correctly.
Most healthy people tolerate probiotics well, but if you have a weakened immune system, a serious illness, or a central line, check with your clinician first, as probiotics are not appropriate for everyone.