Please ensure the lid is screwed on nice and tight. The pump will only produce the drop when the pump is compressed all the way to the bottom. When you slowly push down nothing will come out until you feel the click on the final 10%. Unlike a typical spray bottle where you get more or less solution to come out depending on how hard or soft you squeeze, there is a "stop" nearly all the way down these pumps. If you push past that, that is where the drop is properly actuated. The "stop" nearly all the way down does feel like the pump was pressed fully, but you do need to press just a tad bit harder to get the full dose.