Embodiments of the present disclosure provide methods, systems, and apparatuses for aiding weight loss in a patient. According embodiments, an exemplary system for aiding weight loss in a patent comprises a subcutaneous biodegradable medical implant placed or injected in the patient, the biodegradable medical implant comprising naltrexone (C20H23NO4) and capable of releasing the naltrexone from the subcutaneous biodegradable medical implant following the placement of the subcutaneous biodegradable medical implant in the patient； and an optional program comprising behavioral counseling and/or therapy delivered by a licensed professional to the patient.
