Magnetite / hydroxyapatite composite is a material that can be used as a drug carrier. The purpose of this study was as well as analyzing variations in time and FeCl3 concentration on the characteristics of composites produced using the hydrothermal method. A total of 0.3248 gr FeCl3.6H2O (2 mmol or 0.05 M), sodium citrate 1.1764 gr (4 mmol or 0.10 M), and 0.3604 gr urea (6 mmol or 0.15 M) diss…