Bactericidal and Bacteriostatic Effect
Another classification system is based on whether an antibiotic kills microorganism (bacterial effect) or merely inhibits growth (bacteriostatic effect). Penicillins, aminoglycoside, vanconmycin, bacitracin , the polymyxin, and colistin are bactericidal. Tetracyline, on the other hand, is bacteriostatic. When susceptible bacteria are exposed to tetracycline, growth will cease temporally and then resume.
Spectrum of Activity
- The species of susceptible microorganism (for example, staphylococcus, streptococcus, and E coli)
- Weather the species are gram-positive or gram-negative.