Rarraba: Magungunan rigakafin ƙwayoyin cuta sun kasu kashi biyu: maganin rigakafi da magungunan rigakafi na roba. Abubuwan da ake kira maganin rigakafi sune metabolites da microorganisms ke samarwa,  wanda zai iya hana girma ko kashe wasu ƙananan ƙwayoyin cuta.  Magungunan da ake kira roba maganin kashe kwayoyin cuta abubuwa ne na kashe kwayoyin cuta da mutane ke samarwa ta hanyar hada sinadarai, ba a samar da su ta hanyar kwayoyin halitta ba.

Magungunan rigakafi: Gabaɗaya magungunan rigakafi sun kasu kashi takwas: 1. Penicillins: penicillin, ampicillin, amoxicillin, da sauransu; 2. Cephalosporins (pioneermycins): cephalexin, cefadroxil, ceftiofur, cephalosporins, da dai sauransu; 3. Aminoglycosides: streptomycin, gentamicin, amikacin, neomycin, apramycin, da dai sauransu; 4. Macrolides: erythromycin, roxithromycin, tylosin, da dai sauransu; 5. Tetracyclines: oxytetracycline, doxycycline, aureomycin, tetracycline, da dai sauransu; 6. Chloramphenicol: florfenicol, thiamphenicol, da dai sauransu; 7. Lincomycins: lincomycin, clindamycin, da dai sauransu; 8. Sauran nau'ikan: colistin sulfate, da dai sauransu.