An adjustable dosage limiting device is includes an elongated connecting member that has a plunger receiving head at a first end for capturing a plunger flange of a plunger of a syringe. A slidable member having a barrel loop is movable along the elongated connecting member. The slidable member slides up/down the elongated connecting member until, at a preset dosage, a locking mechanism is engaged to lock the slidable member, and hence the barrel loop, in place on the elongated member. Once locked in place, the adjustable dosage limiting device limits a dosage provided by the syringe based upon a distance between the plunger receiving head and the barrel loop as set by the locking mechanism.
