What are the hazards of intravenous administration?

Although intravenous administration can reach a high blood concentration in a short time and ensure the complete injection of drugs, intravenous injection needs a high technical level in children; In the hot season, it is easy to cause infusion reaction; Intravenous injection of oil-soluble or oil-water suspension may cause vascular embolism; Some drugs, such as norepinephrine, calcium chloride, mannitol, etc. If they leak from blood vessels, it will lead to local tissue necrosis. Repeated injections in the same blood vessel can cause phlebitis. Therefore, in order to save trouble, don't blindly believe in intravenous administration, abuse intravenous injection, intravenous drip and other administration methods, sometimes not only ineffective, but also increase the risk of drug poisoning and allergic reactions.