I've seen users get stuck without realizing there was still more data entry to do before a med is fully "selected":

In this screenshot, it's not obvious that you have to click one more time to finish selecting a med. (You have to click to choose a drug; then a dose form; then a semantic clinical drug -- which means three clicks, and the UX doesn't make this progression / requirement clear.)
I've seen users get stuck without realizing there was still more data entry to do before a med is fully "selected":
In this screenshot, it's not obvious that you have to click one more time to finish selecting a med. (You have to click to choose a drug; then a dose form; then a semantic clinical drug -- which means three clicks, and the UX doesn't make this progression / requirement clear.)