How to Self Administer Subcutaneous & Intramuscular Injections L Carnitine Body Contouring Institute BCN Mesotherapy Serum Dermishop Subcutanous injection self administration South Tees Hospitals NHS Foundation Trust Subcutaneous Injection: What It Is and How to Give One Intramuscular vs. Subcutaneous Injections: What's the Difference? Intramuscular (IM) shots go deep into the muscle for faster absorption, while subcutaneous (SubQ) injections are placed just under the skin for slower, more sustained Subcutaneous Injection: What It Is and How to Give One