A syringe holder for a motorized injection device, the syringe holder being adapted to receive a receptacle intended to contain a fluid or viscous substance, preferably a disposable refillable receptacle or a syringe, as well as being adapted to be mounted on the motorized injection device such that the motorized injection device enables a part or all of the fluid or viscous substance contained in said receptacle to be expelled. The syringe holder includes a first activator portion to control a predefined function of the motorized injection device. The syringe holder is distinguished in that it comprises a second activator portion to control said predefined function of the motorized injection device independently from the first activator portion.