Post intensive care syndrome (PIC syndrome) is an important problem in modern intensive care strategy. Understanding the mechanisms of PIC syndrome helps prevent it in patients with respiratory, neuromuscular transmission, and cognitive impairments that require prolonged support of vital functions. Significant role in the formation and severity of PIC syndrome is played by the severity of the systemic inflammatory response, which is an individual reaction of the body, and this determines the degree of neurological and psychological deficits. Chronic diseases such as diabetes mellitus, especially in the context of metabolic syndrome, worsen the course of PIC syndrome and delays recovery. Early initiation of rehabilitation measures in the intensive care unit and subsequent expansion of the individual rehabilitation program contributes to the rapid and successful recovery of not only vital functions, but also cognitive, motor and emotional disorders. This shortens the hospital stay of patient and improves their quality of life after discharge.

Inclusion Criteria:

• Men and women over 18 years of age and older;
• Stay in the ITU and (or) intensive care unit for at least 3 days;
• Diagnosed "post intensive care" syndrome (PIC syndrome) with moderate-to-severe severity >3<6 points
• Diagnosed modalities "critical illness polyneuropathy, respiratory neuropathy, dysphagia" of the domain "Neuromuscular complications" of PIC syndrome at 2-3 stages of the rehabilitation route at any value of PICS severity index
• Diagnosed modalities "decreased gravitational gradient, decreased exercise tolerance" in the domain "Vegetative-metabolic complications" at 2-3 stages of the rehabilitation route at any value of PICS severity index

Exclusion Criteria:

• Premorbid level of vital activity when assessed on the rehabilitation routing scale 4-5 points;
• Hematocrit ≤30%;
• Hemoglobin level ≤80 g/L;
• Acute cardiac failure;
• Acute respiratory failure;
• Acute renal failure;
• Acute liver cell failure;
• Use of drugs from "metabolic agents" pharmacotherapeutic group at the time of inclusion in the study
• Life expectancy of 6 months or less or presence of incurable diseases in decompensation stage

The observational program will include adult patients of both sexes with signs of PIC syndrome after a stay in Anesthesiology, reanimation and intensive treatment department due to acute cerebral insufficiency for at least 72 hours, hospitalized for stage 2-3 rehabilitation in a rehabilitation center between 14 and 60 days after the onset of the disease.

The group of patients who received Cytoflavin at stage 1 during the RehabIT program will be "automatically" allocated to the Basic Therapy + Cytoflavin group