Pills, anti-stink underarm stuff, vitamins, snake oil, toothpaste, scissors, nose-hair plucking devices, spare change, whatever you usually put into the medicine cabinet needs to be organized.
I found much more room in mine than there were shelves and dividers.
There was room up high for another shelf, so I went through the scrap pile at the very fine wood shop here and made a shelf.
The organizer in the first picture has been with us for years.
I would show the shelf installed, but then, I would have to clean it up and make it photo-worthy.... Too much important stuff to do for me to do that...