Amino acid refers to amino acid injections, how many days it takes for the infusion to be effective varies from person to person, generally speaking, it can gradually take effect in 2 to 3 days, and a few patients need a longer period of time. Infusion of amino acid drugs is mainly used in the treatment of cirrhosis, subacute or chronic severe hepatitis, hepatic coma, as well as the supportive treatment of chronic hepatitis, which plays a role in improving plasma protein level and promoting the recovery of liver function. Generally, there is obvious improvement in patients’ symptoms after 2 to 3 days of medication, if the patient’s condition is critical the effect may not be obvious, and it will take a slightly longer time to have some relief. In addition, it is impossible to generalize how long the infusion will take to completely improve the patient’s condition. Rapid infusion of amino acids may lead to palpitations, nausea and other adverse reactions, severe acidosis, congestive heart failure and renal failure patients need to be used with caution, and long-term infusion is not recommended. It is recommended to follow the doctor’s instructions for rational use to avoid adverse effects.