Environmental protection has increased over the years all over the world. In this investigation, the adsorption properties of live activated sludge (0.5 g and 1 g) for ivermectin, metamizol sodium and gentamicin sulfate were performed as a biosorbent. The biosorption of these veterinary pharmaceuticals were investigated in a batch system. The equilibrium adsorption data were described by Dubinin-Radushkevich (D-R) adsorption isotherm model. The adsorption equilibrium is attained within 20 min for ivermectin and gentamicin sulfate and 10 min for metamizol sodium. The estimated values of adsorption energy, Ea, calculated from the D-R isotherm, for all pharmaceuticals, ivermectin and live activated sludge (1.0 g) system were found to be 9,622 kJ mol(-1) at room temperature, which implies that adsorption of ivermectin onto live activated sludge (1.0 g) is by ion exchange.