Ukwahlukaniswa: Imithi elwa namagciwane ihlukaniswe izigaba ezimbili: ama-antibiotic kanye nemithi yokwenziwa elwa namagciwane. Okubizwa ngokuthi ama-antibiotics ama-metabolites akhiqizwa ama-microorganisms,  okungase kuvimbe ukukhula noma kubulale amanye ama-microorganisms athile.  Imithi ebizwa ngokuthi i-synthetic antibacterial yizinto ezilwa namagciwane ezikhiqizwa abantu ngokusebenzisa i-chemical synthesis, hhayi ukukhiqizwa kwe-microbial metabolism.

Ama-antibiotics: Imithi elwa namagciwane ngokuvamile ihlukaniswa izigaba eziyisishiyagalombili: 1. Ama-penicillin: i-penicillin, i-ampicillin, i-amoxicillin, njll.; 2. Cephalosporins (pioneermycins): cephalexin, cefadroxil, ceftiofur, cephalosporins, njll; 3. Aminoglycosides: streptomycin, gentamicin, amikacin, neomycin, apramycin, njll.; 4. Macrolides: erythromycin, roxithromycin, tylosin, njll; 5. I-Tetracyclines: i-oxytetracycline, i-doxycycline, i-aureomycin, i-tetracycline, njll.; 6. I-Chloramphenicol: i-florfenicol, i-thiamphenicol, njll.; 7. I-Lincomycins: i-lincomycin, i-clindamycin, njll.; 8. Ezinye izigaba: i-colistin sulfate, njll.