Subcutaneous administration is a method of delivering medications or substances directly under the skin. This route of administration involves injecting the medication into the subcutaneous layer of tissue, which lies between the skin and the muscle. This method is commonly used for the administration of medications that require slow absorption, such as insulin, vaccines, and some types of hormonal therapies. Subcutaneous injections are typically given at a shallow angle and can be administered by healthcare professionals or self-administered by patients. This route of administration is generally considered safe, convenient, and effective for delivering certain medications.