A rechargeable automatic injector for adrenaline injection, the automatic injector having a housing to accommodate a syringe (900) with a needle (902) (902), the syringe being positioned mobilely in the housing (400) between a first position in whose position the needle (902) is housed inside the housing (400) and a second position in whose position the needle (902) protrudes outside the housing (400), a piston rod (1500) configured to advance in the syringe to administer at least one dose of medicament, a tube (1100) of the piston rod having two or more deviable locking elements configured to interact with a piston rod stop to normally block the piston rod (1500) from the piston to the tube ( 1100) of the piston rod, a syringe actuator (1200) configured to apply a force to the syringe thus moving the syringe from the first position to the second position, the action being configured onador (1200) of the syringe to advance the tube (1100) of the piston rod with the piston rod (1500) to the second position, an actuator (1600) of the piston rod configured to apply a force to the rod (1500) of the plunger to advance the plunger rod (1500) into the syringe to administer a dose of medication by unlocking each of the two or more deviable locking elements (1108, 1110), a refill mechanism configured to retract the syringe from the second position to the first position and reload the syringe actuator (1200) to allow repeated activation of the syringe actuator (1200), in which the refill mechanism is configured to unlock a first element (1108) deviable blocking of the two or more deviable blocking elements after a first movement of the syringe from the first position to the second position to thereby release the rod (1500) of the tube piston (1100) of the piston rod for administering a first dose of medication and unlocking a more flexible blocking element (1110) of the two or more deviable blocking elements after further movement of the syringe from the first position to the
