There are three main types of injection sites, Injections can be given in several ways. The way in which a medication needs to be injected depends on a number of factors, including how the drug is made, how quickly its effects are required and how much liquid its injection administers.
The three main types of injection Sites are:
→ Intramuscular (into a muscle)
→ Subcutaneous (under the skin)
→ Intravenous (into a vein)
Intravenous infusions are typically given by a health care provider in a clinic or a hospital setting.
Parts of a syringe:
A syringe has three main parts: a barrel, a plunger and a needle. The barrel holds the medication. The plunger pushes the medication from the barrel through the needle. The needle delivers the medication into the injection site.
What is an Intramuscular Injection?
An intramuscular injection, as illustrated in the figure below, delivers medication deep into the muscle tissue. This allows the medication to be quickly absorbed into the bloodstream for action.
The following are sites for injections. Alternate the injection site each time you inject to avoid soreness at any one sight.
Find the lower edge of the acromial process and the point on the lateral arm in line with the axilla. Insert the needle 1” to 2” below the acromial process, usually two or three fingerbreadths.
Typical injection: 0.5 ml (range: 0.5 to 2.0 ml)
Vastus Lateralis Site:
Use the lateral muscle of the quadriceps group, from a handbreadth below the greater trochanter to a hand breadth above the knee. Insert the needle into the middle third of the muscle parallel to the surface on which the patient is lying.
Typical injection: 1-4 ml (range 1-5 ml)
Inject above and outside a line drawn from the posterior superior iliac spine to the greater trochanter of the femur. Or, divide the buttock into quadrants and inject in the upper outer quadrant, about 2” to 3” below the iliac crest.
Typical injection: 1 to 4 ml (range: 1-5ml)
Differences between inject able medication and oral medication:
When a medication is taken by mouth, it goes through several steps. First the medication is broken down by the digestive system. It is then absorbed into the bloodstream. From there, the medication is delivered to its site of action. Once it produces its effects, it is broken down by the body relatively quickly. Because of the many steps involved, it takes a period of time for an oral medication to produce its effects.
When a medication is injected, it bypasses the digestive system and is absorbed into the bloodstream. Some injectable medications are formulated to slowly release the active ingredients and produce their effects longer, often days or weeks. This may mean you have less frequent injections.