A drug administration device including a push button, plunger, housing extending in an axial direction to define top and bottom ends, and bolus refill indicator is provided. The indicator is disposed on the plunger and visible through a window in the housing. The indicator can include a first section having a first color located towards the top end of the housing, a second section having a second color located towards the bottom end of the housing, and a third section disposed therebetween including a gradient between the first and second colors. Alternatively, the indicator can include a line extending in a direction perpendicular to the axial direction. The housing includes a first indicator reference point that is a first color and aligned with a bottom of the indicator window and a second indicator reference point that is a second color and aligned with a top of the indicator window.
