Antibiotics work by killing off the bacteria that are causing your infection. Unfortunately, they also kill off many types of normal bacteria that colonize your body. This side effect can lead to symptoms. For example, if the antibiotic kills some of the bacteria living in your colon, the result can be a few days of temporary diarrhea. Similarly, if the antibiotic kills off some of the bacteria living in the vagina, the result can be a vaginal yeast infection.
In some investigations, yogurt has been shown to prevent these side effects (diarrhea and yeast infections). It does this because yogurt contains some types of bacteria that can replace the normal bacteria that are being killed off by the antibiotics. These are called 'probiotics'. Therefore taking yogurt may be a good idea. If you decide to do it, make sure to use a "probiotic" yogurt, which has higher concentrations of these bacteria than normal yogurt. You should continue to take the yogurt for 1-2 weeks after finishing the antibiotics.
If you develop diarrhea that is persistent, abdominal pain
, bloating, or fever
you should see your doctor
. Similarly, if you are a woman and you develop significant vaginal itching or discharge you should see your doctor.