An injection is a way of injecting a liquid into a person using a needle or syringe. It is more commonly known as the jab or around the world shot. There are a wide variety of drugs that can be injected into the body by injection, but why aren’t they injected in the same place? Why do different drugs need to be given to different places in the body using different types of injections?
When we talk about different types of injections, we are referring to the body tissue or the route where they are injected.
The most common types of injections are:
Intravenous or IV
They are the fastest way to inject medication and involve using a syringe to inject it directly into the vein. They include medications that are needed immediately, such as pain relievers, antibiotics, or antifungal agents such as morphine.
Intramuscular or IM
These are delivered deep into the muscle where the drug can be quickly absorbed into the surrounding blood vessels. An example of this is the Covid-19 vaccines. The blood in the muscles continues to circulate rapidly, which helps IM injections transport fluid throughout the body at a constant rate. Due to this, more drug can be delivered as the blood flow is faster.
Subcutaneous or SC
SCs are injected into the innermost layer of skin called the subcutaneous or hypodermis, which is made up of a network of fat cells and collagen. These work more slowly than IV or IM injections because the area does not have such a rich blood supply. Insulin given to a diabetic patient is an excellent example. The injections do not require a long needle as they only have to go through the fatty tissue in the inner layer of the skin.
Intradermal or ID
These injections are administered directly into the middle layer of the skin called the dermis. They absorb the slowest compared to the rest of the aforementioned injections. They are not meant to deliver medicine or supplements and are only 1 inch long so can tear the body to some degree.
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