An intramuscular injection is a technique used to deliver a medication deep into the muscles. This allows the medication to be absorbed into the bloodstream quickly.Intramuscular injections are absorbed faster than subcutaneous injections. This is because muscle tissue has a greater blood supply than the tissue just under your skin. Muscle tissue can also hold a larger volume of medication than subcutaneous tissue.They may be used instead of oral delivery because some drugs are destroyed by the digestive system (gastrointestinal plasters) when you swallow them and often it can be prefered when the effect of the drug should be seen very quickly.It is applied to the dorsogluteal region (posterior hip), ventrogluteal region (lateral hip), femoral region (thigh) and deltoid muscle regions.