Nhazi: A na-ekewa ọgwụ nje na-egbu nje ụzọ abụọ: ọgwụ nje na ọgwụ nje nje. Ihe a na-akpọ ọgwụ nje bụ metabolites nke microorganisms na-emepụta,  nke nwere ike igbochi uto ma ọ bụ gbuo ụfọdụ microorganisms ndị ọzọ.  Ihe a na-akpọ ọgwụ nje antibacterial sịntetik bụ ihe ndị na-egbu nje ndị mmadụ na-emepụta site na njikọ kemịkalụ, ọ bụghị site na microbial metabolism.

Ọgwụ nje nje: A na-ekekarị ọgwụ nje nje ụzọ asatọ: 1. Penicillins: penicillin, ampicillin, amoxicillin, wdg; 2. Cephalosporins (pioneermycins): cephalexin, cefadroxil, ceftiofur, cephalosporins, wdg; 3. Aminoglycosides: streptomycin, gentamicin, amikacin, neomycin, apramycin, wdg; 4. Macrolides: erythromycin, roxithromycin, tylosin, wdg; 5. Tetracyclines: oxytetracycline, doxycycline, aureomycin, tetracycline, wdg; 6. Chloramphenicol: florfenicol, thiamphenicol, wdg; 7. Lincomycins: lincomycin, clindamycin, wdg; 8. Ụdị ndị ọzọ: colistin sulfate, wdg.