When bacteria are exposed to the same antibiotics, after a while the antibiotic can't fight the germs anymore. Being exposed to the same antibiotic for a long time can make some germs change. Sometimes germs just change by themselves. Some of the changes make the germs so strong, they can fight back against antibiotics and win the fight. These strong germs can live and multiply, even while you are taking antibiotics.
Germs can even become resistant to many antibiotics.
Antibiotic resistance is becoming a common problem in many parts of the United States. If you take antibiotics that are resistant to the germs they are supposed to kill, your infection can last longer. Instead of getting better, your infection might get worse. You might have to make several visits to your doctor's office. You might have to take different medicines or go to a hospital for antibiotics given in your veins.