Four Types Of Injections You Need To Know

There are four types of injections and their names are related to the way they are given. In this article we give you a description of them.
Four types of injections you need to know

There are four types of injections and we classify them according to how they are absorbed into the body. Injectables are of the parenteral type and come in two types of glass containers: ampoules and vials.

Ampoules are a closed system with long necks and a narrowing at the bottom. Once you have broken the seal or “neck”, you can extract the fabric.

Vial is also a closed system, but with a short neck and a hard plastic stopper with metal over. You need to inject the same amount of oxygen as the substance to get the contents out.

The substance may be ready for use as is, or require mixing with another substance first. Here are four types of injections and a description of each one.

Nurse puts drip up in front of patient

 Injections into the blood vessels are used in the following cases:

  • Acute situations.
  • Serum therapy.
  • Diluted substances.

It is the fastest way to inject, as the substance is absorbed into the body immediately.

2. Intradermal injection

This type of injection is used to make diagnostic tests, skin tests for allergy tests, for example, and local anesthesia.

For intradermal injections, a maximum of 0.3 milliliters of medicine should also be given at the same time. This is usually done with a 1 milliliter syringe or a short, slanted needle that is often orange or clear in color.

It can be inserted into parts of the shoulder, in the middle of the forearm or at the top, in the middle of the back.

Procedure for intradermal injection

One hand is used to tighten the skin at the area to be inserted, and the other hand guides the needle almost parallel to the skin and with the slope upwards. The medicine forms a blister. Finally, remove the needle without putting pressure on the blister.

3. Subcutaneous injection

In this type of injection, the drug is inserted under the skin. The most common substances for this procedure are:

  • Vaccines.
  • Heparins.
  • Insulin.

The amount varies between 1.5 and 2 milliliters with syringes of 1 or 2 milliliters and an orange, medium-sized, oblique needle. It is a method of slow absorption, and the most commonly used areas for the injection are on the outside of the arm, the inside of the thigh, as well as the abdomen or behind the shoulders.


After disinfecting the area, a fold is made in the skin. Insert the needle at a 45-degree angle with the slope upwards. The plunger should eventually be pulled to ensure that no hole has been made in a blood vessel.

However, the angle is different when injecting heparin. Here it is important to inform the patient not to press or push at the injection site to avoid bruising.

4. Intramuscular injections

Doctor gives patient injection in arm

This type of injection is used for medications that need to be in the muscles. The most common drugs for this method are vaccines and other drugs such as painkillers, anti-inflammatory drugs, corticosteroids and antibiotics.

There is a faster absorption than with subcutaneous injections, as the effect is already seen after 15 minutes. Less than 15 milliliters are injected, and the syringe is between 2 and 5 milliliters with a medium-sized, oblique needle and green color in adults.

The most common areas to give the injection are on the outside of the buttocks, the shoulder or on the outside of the thigh.


At this injection , the doctor gives it at a 90-degree angle. The plunger on the syringe is then pulled back slightly to make sure that no blood vessels have been inserted.

The medicine is given slowly and it can be very painful. It can, as the muscle fibers become disjointed when the fluid is injected. The needle and syringe are removed at the same time after treatment.

The different types of injections depend on the medication and the situation

As you can see, there are several ways to give injections and which one to use depends on several different things. Now, however, you know a little more about the different procedures, so you know what to do next time you go for a trip to the hospital!

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