some bacteria are resistant to antibiotics, which reduces the effectiveness of antibiotics
antibiotics become less effective due to:
overuse
incomplete courses (patients don't complete entire prescribed duration of antibiotics)
if antibiotics are overused, it allows resistant bacteria to survive and reproduce - leading to the rise of an entire strain with antibiotic resistance
common drug-resistant bacteria: MRSA
to slow down development of antibiotic resistant bacteria, antibiotics should be:
used only when truly necessary
course of antibiotics given to patient should always be fully completed