Bad Body Odor and bad breath are directly connected to the level of the friendly bacteria in you body. Bad bacterias are anaerobic (live without oxygen) and stink. Good (friendly) bacterias live in an oxygen environment and are odorless. I have read many stories of people saying the same thing like you: Body Odor after taking antibiotic. You have to fill your body with abundant probiotics. Take Primal Defense (6 to 12 dayly) and you will see some improvement after 3 or 4 weeks. Hope this helps