Excess dose alert system for a dosing pen

A dosing pen comprising:

• a barrel adapted to house a fluid reservoir coupled to a piston plunger configured for longitudinal movement within the fluid reservoir;
• a needle assembly fit to a distal end of the barrel and providing a channel for fluid in the fluid reservoir to travel to an exit orifice of a needle in the needle assembly;
• a dosage knob calibrating a volume of the fluid to be forced through the needle upon longitudinal actuation of the piston plunger;
• an injection button configured upon depression to motivate the piston plunger towards the needle assembly;
• a feedback element having dual states consisting of an operable state and an inoperable state, the operable state initiated in response to the depression of the injection button and lasting for a period of time measured by a countdown timer triggered by the depression;
• and,
• a finger placement sensor at a top surface of the injection button, the sensor electrically actuating the feedback element when the feedback element has been latched in the operable state.