An intravenous (IV) injection is administered by introducing a medication or substance into the veins by using a needle. The substance or medication to be injected is stored in a clean syringe or bag attached to the needle. The needle is then inserted into the patient's vein, often in the hand or inside the elbow. Ideally, you should have medical training before administering an intravenous injection.

Before an IV injection is given, the skin should be cleaned with alcohol or another disinfectant. A tourniquet is usually used to make the veins more easily visible and accessible. With a quick motion, the needle is inserted into the vein from a shallow angle; the other hand is used to pull the skin gently in the opposite direction from the needle insertion. A small amount of blood should enter the needle, which indicates that it is in the vein. The injection is then given or an IV line attached.

An intravenous injection is a means of therapy and routine treatment, and a variety of drugs are given intravenously. In some cases, water, saline, or other fluids are used to address dehydration. Fluids can be administered over a period of time; a physician, nurse, or other medical staff will determine how long the fluids should be given.

If you have to administer an intravenous injection containing drugs or other fluids, the substance you will be injecting may be stored in a bag that is attached to a pole and hung slightly above the patient. The flow of the substance can usually be controlled by clips that are connected to the tube. If the clips are not manipulated, gravity will naturally force the liquid down and the substance will drip slowly toward the vein. If the clip is loosened, the flow will be increased, and the drugs or fluids can be administered quickly to replace the fluids or provide pain medication the patient needs.

Intravenous feeding and blood transfusions can also be administered through an IV tube. It is also possible to administer more than one medication or substance through an IV. In a hospital or clinic, medical personnel with typically deal with administering any required intravenous injection.

An intravenous injection can also be administered outside of a medical environment. An ill patient may need to receive IV fluids or medication at home, for example. A clean needle must be used each time an intravenous injection is administered.

You must be extremely careful when you administer an intravenous injection to avoid complications. Improper administration could result in an air embolism, when a large amount of air enters the patient's blood stream. If IV fluids are given too quickly, the body may not be able to absorb them, leading to serious health problems. Needles that are not clean can cause the transmission of diseases, including HIV and hepatitis, as well as infection.