An apparatus (100) for injection of ampoules under the skin of an animal comprises an elongate housing (120) with a plunger (125) that is movable in the longitudinal direction of the housing in order to urge two ampoules simultaneously through two parallel cannulas (110, 111). Preferably, the apparatus (100) has an arm (131, 133) pivoting about a shaft (137). A short arm (133) enhances the force exerted to the long arm (131), such that the user does not need to use a large force for the injection. This reduces the risk for displacing a large force while the cannulas (110, 111) are under the skin of the animal. Varieties wherein the injection is performed by means of a biased driving spring and/or pressurised gas as well as a trigger mechanism are also disclosed.
