Antibiotics not only kill bacteria, they can also harm the body by causing allergic reactions. Many people die each year due to allergic reactions to antibiotics. Upsetting the natural balance. Not all bacteria in the body are harmful. Some are necessary for the body to function normally.
Antibiotics often kill the good bacteria along with the harmful ones.
Antibiotics may kill some kinds of bacteria necessary for digestion, upsetting the natural balance of bacteria in the gut. Thus, persons who take ampicillin and other broad-spectrum antibiotics for several days may develop diarrhea. Resistance to treatment. When attacked many times by the same antibiotic, bacteria become resistant and are no longer killed by it. For this reason, certain dangerous diseases like typhoid are becoming more difficult to treat than they were a few years ago.