A huge variety of antibiotics and kinds of their influence on a human body was the reason of separations of antibiotics into groups. On character of influence on a bacteriemic cell antibiotics can be parted on three groups: Bacteriostatic (bacteria are live, but not in a condition to breed), Bacterolytic (bacteriemic cellular walls are blasted).

Classification by chemical structure which widely use in medical medium, consists of following groups: Cephalosporins - possess similar structure with Penicillinums.

Macroleads - antibiotics with difficult cyclic structure. Action - bacteriostatic. Tetracyclinums - are used for treatment of infections of respiratory and urinary ways, treatment of serious infections of type of a malignant anthrax, a tularemia. Action - bacteriostatic.

Aminoglycosides - possess high toxicity. Are used for treatment of serious infections of type of infection of blood or peritonitises.

Levomycetinums - Use is limited because of the raised danger of serious complications - a lesion of the osteal brain developing blood cells. Action - bactericidal.

Antimicotic - blast a membrane of cells of funguses and cause their destruction. Action - lytic. Are gradually superseded by highly effective synthetic antimicotic preparations.