i used antibiotics years ago and it fucked my gut up enough where i could def tell.. what i did was get something called sach boulardii which is sold everywhere, but you need to get the quality stuff from the fridge at your health food store.. don't buy off amazon or from CVS.
my advice is stay away from antibiotics. i know people won't listen to me cause docs hand them out like candy, but one day they won't work anymore on you and then what? use ONLY as a last resort