The data on bacteriophage preparations, their features and benefits in comparison with other therapeutic agents are shown. The matters of phages production history to the present time are described. The data of phages application in clinical practice for the treatment, diagnostics, infections monitoring, sanitation of facilities and equipment, and conducting scientific research are shown. The benefits of phages drug are shown: affect only on specific sensitive bacteria, do not compromise the immunity, as opposed to antibiotics do not cause bacterial resistance, penetrate well into the humans and animals tissues, do not suppress the growth of normal flora and could be combined with any medication.