In medicine, a<unk> , or subcutaneous pellet, is an implant that is delivered under the skin into the subcutaneous tissue by surgery or injection and is used to deliver a drug for a long period of time. Examples of drugs that can be administered in this way include leuprorelin and the sex steroids estradiol and testosterone.
Subcutaneous implant
Transdermal patch
Intramuscular injection
Subcutaneous injection
Implant 
Injectable filler
Intrathecal administration
Subcutaneous infusion