The invention provides a syringe accessory device for adjustment of a predefined partial syringe dosage comprises a recess (10) for receiving a syringe body (14). Additionally, within a single portion (12) a slot (16) is located. Within the slot (16) a syringe flange (18) or finger grip can be held. To obtain a predefined dosage of liquid within the chamber of the syringe body (14), a plunger (26) is pressed in the chamber (14) in the direction of the arrow (38) until the plunger head (44) contacts a stopping means (24) whereby the stopping means is performed by a stopping surface (24) of the single portion (12). The invention further provides a kit comprising said syringe accessory device and its use for adjusting defined liquid dosages in syringes.