Antibiotics: a compound or substance that kills or suppresses the growth of bacteria/or fungi Selectivity toxicity A drug that kills harmful microbes without damaging the host Selectively toxic for bacteria destroy structures present in bacteria, not present in host Minimize harm to patient less or no toxic to patientSelectivity toxicity A drug that kills harmful microbes without damaging the host  Selectively toxic for bacteria -destroy structures present in bacteria, not present in host  Minimize harm to patient - less or no toxic to patient Antibiotics: a compound or substance that kills or suppresses the growth of bacteria/or fungi