The adverse reactions of intravenous infusion are as follows: 1. Pain at the mouth of the needle or vein of the intravenous infusion, which is commonly caused by the infusion of more irritating drugs into the blood vessels. There may be pain in the whole mouth, and in serious cases, it may also affect the swelling and pain in the superficial vein of the whole infusion. 2, infusion reaction, because some pyrogenic sources or impurities in the infusion of drugs, resulting in sudden chills, high fever, and also accompanied by pale face, cold sweat, etc., is generally the main infusion reaction, must immediately stop the infusion and then do the corresponding treatment, generally 3. allergic reactions, usually some allergy-prone drugs, commonly penicillin and other drugs allergic reactions, generally manifested as mild symptoms will have a generalized rash, or wind-blown urticaria, and the rash is itchy, and serious may also appear pale, cold sweat, and even blood pressure drop. In severe cases, there may be pallor, cold sweat, or even a drop in blood pressure and other symptoms of shock.