The active ingredient leuprorelin, is a synthetic peptide that can be used primarily in the treatment of hormone-dependent tumors, particularly prostate cancer. Leuprorelin is administered in the form of a biodegradable implant that releases the active ingredient over a three-month period (11.25 mg dosage). Leuprorelin is the only implant formulation with a self-retracting needle, which makes administration much more convenient for patients.