* the recurrence of covid-19 in the form of re-infection * history of psychiatric diseases * psychotic disorders (in the form of hallucinations and delusions) * anxiety disorders and major depression * substance abuse in the last four months * taking antidepressants during the last six weeks * corticosteroids consumption during the last six weeks * taking psychostimulant drugs * an unstable medical condition * cognitive disorders and confusion * withdrawal from participating in the study * history of rheumatological disease * getting cancer and malignancy * advanced chronic diseases (heart, liver, kidney, etc.) * edema of organs * hypertension (untreated) * hypogonadism (untreated) * hypothyroidism (untreated) * anemia (untreated) * pregnancy and breastfeeding * nausea and vomiting when starting to take amantadine * convulsions * dyspnea * post-covid-19 encephalopathy

* the recurrence of covid-19 in the form of re-infection * history of psychiatric diseases * psychotic disorders (in the form of hallucinations and delusions) * anxiety disorders and major depression * substance abuse in the last four months * taking antidepressants during the last six weeks * corticosteroids consumption during the last six weeks * taking psychostimulant drugs * an unstable medical condition * cognitive disorders and confusion * withdrawal from participating in the study * history of rheumatological disease * getting cancer and malignancy * advanced chronic diseases (heart, liver, kidney, etc.) * edema of organs * hypertension (untreated) * hypogonadism (untreated) * hypothyroidism (untreated) * anemia (untreated) * pregnancy and breastfeeding * nausea and vomiting when starting to take amantadine * convulsions * dyspnea * post-covid-19 encephalopathy

the recurrence of covid-19 in the form of re-infection history of psychiatric diseases psychotic disorders (in the form of hallucinations and delusions) anxiety disorders and major depression substance abuse in the last four months taking antidepressants during the last six weeks corticosteroids consumption during the last six weeks taking psychostimulant drugs an unstable medical condition cognitive disorders and confusion withdrawal from participating in the study history of rheumatological disease getting cancer and malignancy advanced chronic diseases (heart, liver, kidney, etc.) edema of organs hypertension (untreated) hypogonadism (untreated) hypothyroidism (untreated) anemia (untreated) pregnancy and breastfeeding nausea and vomiting when starting to take amantadine convulsions dyspnea post-covid-19 encephalopathy

the recurrence of covid-19 in the form of re-infection history of psychiatric diseases psychotic disorders (in the form of hallucinations and delusions) anxiety disorders and major depression substance abuse in the last four months taking antidepressants during the last six weeks corticosteroids consumption during the last six weeks taking psychostimulant drugs an unstable medical condition cognitive disorders and confusion withdrawal from participating in the study history of rheumatological disease getting cancer and malignancy advanced chronic diseases (heart, liver, kidney, etc.) edema of organs hypertension (untreated) hypogonadism (untreated) hypothyroidism (untreated) anemia (untreated) pregnancy and breastfeeding nausea and vomiting when starting to take amantadine convulsions dyspnea post-covid-19 encephalopathy