The main purposes of this trial are to analyze the pharmacodynamic substances and the effects of Yiqihuayu Decotion for acute ischemic stroke. The trial is a non-randomized, controlled clinical trial.

Yiqihuayu Decotion is effective for acute ischemic stroke clinically, but there is lack of sufficient and reasonable explanation of its intervention effects currently. In order to further clarify the main pharmacodynamic substances of Yiqihuayu Decotion in the treatment of acute ischemic stroke, this study intends to carry out a non-randomized, controlled clinical trial. The primary hypothesis is that, compared with the control group, Yiqihuayu Decotion will produce serial changes in plasma metabolites at pre-dose and 9 days, as well as urine metabolites at pre-dose, 8 days, 9 days and 10 days. The serial changes may be the potential support to explain the intervention effect of Yiqihuayu Decotion. After enrollment, all participants will undergo a 2-day Traditional Chinese Medcine washout period to ensure that the results of pharmacodynamic substances will not be disturbed.

Inclusion Criteria:

• Diagnosis of Acute ischemic stroke;
• Symptom onset of 4 to 6 days;
• 40 ≤ age ≤ 80 years;
• Be conscious and able to cooperate with clinical information gatherers;
• Patient or legally authorized representative has signed informed consent.

Exclusion Criteria:

• Suspected secondary stroke caused by tumor, brain trauma, or hematological diseases;
• Already dependent in activities of daily living before the present acute stroke (defined as modified Rankin Scale score ≥ 2) ;
• Other conditions that lead to motor dysfunction (e.g., severe osteoarthrosis, rheumatoid arthritis);
• Significant renal or hepatic insufficiency (defined as a serum creatinine concentration, alanine aminotransferase (ALT), or aspartate aminotransferase (AST) value that is twice the upper limit of normal);
• Life expectancy of 3 months or less due to other life-threatening illness (e.g.,advanced cancer)
• Other conditions that render outcomes or follow-up unlikely to be assessed;
• Known to be pregnant or breastfeeding;
• Participating in another clinical study.