How long does it take for antibiotics to work?

WebMD shares that although a person may feel improvement in health after just a few days of antibiotic usage, the full prescribed dosage should always be taken. Some of the bacteria may be stronger and take longer to fight.

MedicineNet states that if no change in health is felt after a few days of treatment, it is important to speak with a doctor, as the incorrect antibiotic may have been chosen. Many different types of antibiotics are available, and each works a little differently and affects different types of bacteria, according to WebMD. A doctor will prescribe the appropriate amount and length of prescription for the particular illness.