Long experience in the use of various iodine preparations has shown that while possessing pronounced antibacterial and antiviral properties, wide-spectrum antimicrobial activity, and lacking mutagenic and teratogenic effects, they are toxic when introduced to the human body, which significantly narrows the scope of their clinical application. The search for alternative ways to solve the problem of high toxicity of inorganic iodine compounds has led to the development of iodinecontaining organic complexes. Iodine is characterized by a high bioactivity and exerts wide antimicrobial spectrum with no recorder evidences of resistance development to iodine in bacteria and viruses. The new anti-infectious drug (FS-1) containing molecular iodine has been recently created.