text: We like to say "match the bug, with the drug".  Penicillin was one of the first antibiotics.  It was widely prescribed and used.  With new and better technology, scientists have discovered other drugs that are more sophistocated to treat certain infections.  While yes it is true over prescription of antibiotics, not just penicillin, can cause tolerance, I believe in part the fact that technology has caught up with infections and we have the right medicine to treat them.