There are a few antibiotics that become toxic with age also. Tetracycline is one.
Originally Posted by
hopetoquilt
When an insufficient amount of antibiotic is taken, the bacteria is not completely killed off and the remaining bacteria builds a resistance to the antibiotic. This means that the antibiotic will not longer work against the bacteria. This is why we now need so many different antibiotics. It also explains why we have MERSA and VRE infections that are killing people. It is irresponsible to use a "few" antibiotic pills that were prescribed for something else.