Amino acid infusion can supplement human nutrition, enhance immunity and improve poor appetite, among other effects. For patients with gastrointestinal surgery or gastrointestinal dysfunction, the use of amino acid infusion is a very good choice. However, the use of amino acids has certain limitations, and the following cases are not recommended for amino acid infusion therapy: 1, people who are allergic to amino acids, such as those who have fever, dizziness, headache, nausea, vomiting, chest tightness, palpitations and other pinpoint symptoms during infusion; 2, patients with severe liver and kidney insufficiency; 3, patients with severe acidosis; 4, patients with congestive heart failure should pay attention to the drip rate and amount when using them. In addition to patients with the above conditions, amino acids should not be used, and amino acid solutions with leaking or rising bags, expired, moldy or discolored should not be used.