Safety and Efficacy of the Therapy With BRAINMAX® for the Treatment of Patients With Asthenia After COVID-19

Inclusion Criteria: 1. Patients able to sign the patient informed consent form for the participation in the clinical study 2. Patients of both sexes of 18-65 years of age 3. Patient's negative test result for severe acute respiratory syndrome (SARS) -CoV-2 RNA obtained by polymerase chain reaction (PCR) method within 72 hours 4. COVID-19 diagnosis documented in the history more than 12 weeks ago\* 5. Minimum two symptoms of asthenic state: fatigue, atony, dizziness, sleeping disorder, feeling of energy loss and decreased functioning, intellectual function disorder, attention and memory disorder, which appeared during or after COVID-19, retain for more than 12 weeks and cannot be explained by an alternative diagnosis 6. Patients capable of following the requirements of the Clinical Study Protocol 7. Negative pregnancy test result (for women with the active childbearing potential) 8. MFI-20 scale score is more than 30 at the moment of screening. Exclusion Criteria: 1. Allergic reactions to the components of the study product 2. Oxygen saturation by pulse oximetry (SpO2) oxygen saturation ≤ 95% 3. Depression level score by Hamilton Depression Rating Scale (HDRS) at the screening ≥ 8 4. Intracranial pressure rise (for the reason of venous outflow disorder and intracranial tumours) 5. Severe hepatic failure 6. Severe renal failure 7. Chronic liver and hepatic diseases 8. Thyroid diseases 9. Anaemia 10. Malignant tumour of any localization currently or during 5 years before the inclusion into the study except for completely treated carcinoma in situ 11. Autoimmune diseases 12. Other chronical diseases which, according to the investigator, can cause asthenia 13. G lomerular filtration rate (GFR) parameter at screening \< 30 mL/min 14. Pregnancy or lactation period 15. Participation in any other clinical study during the last 3 months 16. Tuberculosis, cancers or positive reaction to the HIV infection, hepatitis B \& C, syphilis according to the history data 17. Severe eyesight and/or hearing disorders, serious articulation disorders and/or other deviations able to prevent the patient from adequate cooperation during the study) 18. Mental disorders in the history 19. Alcohol, drug abuse or drug dependence in the history 20. Patients which, according to the investigator, are obviously or probably incapable of understanding and evaluating this study information within the process of the informed consent form signing, including but not limited to with regard to expected risks and possible discomfort 21. Other diseases, symptoms or conditions not listed above, which, according to the investigator, are predicaments for the participation in the clinical study Exclusion of patients from the study 1. Erroneous inclusion (inclusion and exclusion criteria violation). 2. Investigator or Sponsor's decision to exclude the patient from the study because of clinically significant deviation from protocol/protocol violation. 3. Serious adverse events or adverse events which do not meet the seriousness criteria and which if developed, according to the investigator, can make the patient's further participation in the study harmful for the patient's health or wellbeing. 4. Any adverse event (there might be no connection with the study drug intake) requiring the observation, procedures and/or drug treatment not allowed by this study protocol. 5. Patient's refusal to continue the participation in the study or his/her lack of discipline. 6. Allergic reaction to the study drug intake, which require its discontinuation. 7. Patient's wish to prematurely terminate the study for any reason. 8. Loss of contact with the patient and his/her absence for the visit. 9. Necessity to use a therapy prohibited by this protocol. 10. Occurrence of pregnancy.