black tongue

I felt an inflamation (inflammation) of my throat , i went to the pharmacy and they prescribe to me antibiotics (Cefadroxil / Biodroxil), i am still in the course , but i am astonished now that my tongue is black , Does these antibiotics affect and change the tongue color to Black ? . Before about two weeks my tongue was white and Dr. said to me that was fungels, but now it is black !