Definition: The term "antibactericillin" is a type of antibiotic. It fights bacteria, but it has side effects that can be unpleasant or dangerous if used improperly. The active ingredient in this drug is an antibiotic molecule called an antimicrobial agent. Antimicrobial drugs are typically prescribed for bacterial infections and are intended to kill the bacteria while not causing harm to healthy cells or tissues. They do not address the root cause of infections, which usually requires antibiotics alone.