What's The Difference Between Intramuscular Injection And Subcutaneous Injection?

The main differences between intramuscular injection and subcutaneous injection are the site and way of injection, the type and dose of injected drugs, and the absorption effect of drugs. See below for details:

Different injection sites

Subcutaneous injection is the injection of liquid medicine into the tissue under the skin. Lower margin of the upper arm deltoid, lateral upper arm, abdomen, back and lateral thigh.

Intramuscular injection is a commonly used drug injection treatment method, which refers to the injection of liquid medicine into muscle tissue through a syringe. The most commonly used injection part of intramuscular injection is the gluteus maximus muscle, followed by gluteus medius, gluteus minimus, vastus lateralis muscle and deltoid muscle.

2. Different absorption effects

Intramuscular injection (intramuscular injection; Intramuscular injection) is absorbed more quickly than subcutaneously due to the abundance of blood vessels in the muscle.

3. Different dosage of drugs

Because intramuscular nerve endings are less distributed than subcutaneous nerve endings, they are less sensitive to painful stimuli. So intramuscular injection can inject oily agent, emulsion and water agent medicine, limit commonly within 5 milliliter.

Subcutaneous injection is generally only suitable for small amounts of drugs (less than 2 ml), preferably in an aqueous solution of non-irritating drugs.

4. Different types of drugs are applicable

Some injections, such as atropine or epinephrine, are available for both subcutaneous and intramuscular injection. Biological products in the vaccine, vaccine needs special attention, some can only provide intradermal injection, if tuberculosis live vaccine can only provide intradermal injection, misinjection to subcutaneous, muscle can produce local abscess. If anthrax live vaccine, freeze-dried brucellosis live vaccine, are used for skin scratches, absolutely cannot be used for injection. Some criterion subcutaneously or intramuscular injection all ok, be like urine road infection vaccine. Rabies vaccine can only be injected in the abdomen or two shoulders under the skin, and is strictly prohibited to inject into the muscle or blood vessels.

5. Different injection methods

Intramuscular injection should be vertically injected, and subcutaneous injection tip should be tilted about 45 degrees for injection.

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