The present invention relates to an implant that is implanted into a human body by means of osseointegration. A drug delivery system comprises: an implant (10) for performing a support function, which is implanted into a human body and a cover unit (20) for performing a covering function, which is coupled to the implant (10). The drug delivery system further comprises: an accommodating unit (12) formed in the implant (10) for accommodating a drug cartridge (30) and intended to be opened/closed by the cover unit (20) a plurality of diffusion units (14) formed in the wall surface of the accommodating unit (12) so as to diffuse and discharge contents of the drug cartridge (30) and injection units (16) formed at the respective ends of the diffusion units (14) for injecting the contents of the drug cartridge (30) into the human body. By continuously injecting drugs using the implant, various inconveniences which might occur due to oral ingestion or injection of the drug and various side effects which might occur due to oral ingestion of the drug are minimized.
