A Trial of Shengmai Liquid for Long COVID Fatigue.

Inclusion Criteria: * Aged between 18 and 75 years; * Meet the above diagnostic criteria; * Meet the traditional Chinese medicine syndrome diagnostic criteria; * Consent and sign the informed consent form Exclusion Criteria: * Currently in need of or expected to require high-flow oxygen therapy, positive pressure ventilation, invasive mechanical ventilation, or extracorporeal membrane oxygenation (ECMO) and other advanced respiratory support measures; * Have a known history of active liver disease (excluding non-alcoholic fatty liver changes), including active hepatitis B or C infection, primary biliary cirrhosis, Child-Pugh class B or C liver function impairment, or acute liver failure. Liver function at screening shows any of the following: serum alanine aminotransferase (ALT) \>3× the upper limit of normal (ULN); serum aspartate aminotransferase (AST) \>3×ULN; serum bilirubin \>2×ULN; * Undergoing dialysis treatment, or known to have moderate to severe renal impairment (i.e., an estimated glomerular filtration rate (eGFR) value calculated based on serum creatinine using the CKD-EPI formula ≤45 mL/min/1.73 m² within 6 months before screening); * Moderate to severe congestive heart failure within 6 months before screening (according to the New York Heart Association classification criteria, with cardiac function class III or IV), experienced a stroke, myocardial infarction, or coronary artery stent implantation; or have uncontrolled hypertension (defined as systolic blood pressure exceeding 160 mmHg or diastolic blood pressure exceeding 100 mmHg, with relevant records). Significant or clinically relevant electrocardiogram abnormalities, such as second-degree type II atrioventricular block, left bundle branch block, etc.; * Suffered from influenza A, influenza B, or other infectious diseases within 3 months before screening; * Have/ever had severe neurological diseases (epilepsy, convulsions, or seizures) or mental illness, or have a family history of mental illness; * Pregnant or breastfeeding. Women who are breastfeeding or have a positive pregnancy test before taking the medication; * History of malignant tumors within 5 years before screening, with existing and progressing tumors, and patients who are expected to need treatment during the study period; * Have chronic fatigue syndrome or autoimmune diseases (such as rheumatoid arthritis, systemic lupus erythematosus, etc.); * Known allergy to any component of the study drug; * Diseases judged by the investigator to be unsuitable for participation in this study; * Taken traditional Chinese medicine containing Codonopsis pilosula, Ophiopogon japonicus, Schisandra chinensis, or Astragalus membranaceus within 2 weeks before screening; * Participating in other drug or medical device-related studies at the same time