Try another one of the antibiotics recommended for that illness. You may not know enough to cure the illness. Get medical help, especially if the condition is serious or getting worse. The use of all medicines should be limited. 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.