Antibiotics: how they work? Antibiotics are special substances of biological origin that can suppress the growth of viruses, bacteria and microorganisms or completely destroy them. The specificity of antibiotics action is the main feature. That is, each specific type of pathogen microorganisms is susceptible not to every type of antibiotics. This feature is the basis of the main modern antibiotics classification: narrow-spectrum antibiotics (suppress the vital activity of bacteria of one type) and broad-spectrum antibiotics (destroy various types of microorganisms)….