How bad is it to take antiviral medicine and not need it?

I WAS DIAGNOSED WITH SHINGLES ABOUT 3 AND 1/2 WEEKS AGO I TOOK 2 COURSES OF ANTIBIOTICS. 1 AT 400 MGS AND 2ND AT 800 MGS. I DID NOT HAVE SHINGLES I HAD A YEAST INFECTION.HOW BAD IS TO TAKE THAT MUCH ANTIBIOTICS AND NOT NEED THEM.