Your doctor will ask if you have ever had allergic reactions to any medicines. This is to make sure you receive the right antibiotic. When an antibiotic is overused or misused, bacteria can become resistant to it. This means that this antibiotic c annot kill the bacteria or keep it from growing. Some bacteria that cause common infections have become resistant to many diffent antibiotics.
Bacteria can develop resistance to antibiotics in many ways.
Some doctors give patients antibiotics when they might not be helpful. Antibiotics won't cure a cold because colds are caused by viruses, not bacteria. Antibiotics do not have any effect on viral infections. The treatment for a cold is generally rest, plenty of fluids and medicines for fever and headache. Also, antibiotics are misused because many patients do not take them according to their doctor's instructions.