The second use for Lotus is as a look-up table for drip rates according to dosage for a variety of cardioactive drugs. It is easy to make a simple mistake in arithmetic that would be trivial in another professions, but disastrous or even fatal when you're dealing with critically ill human beings. This spreadsheet allows me to be confident, even at two a.m., that I am not making any stupid mistakes. It is quicker than doing it by hand, too.
I have just finished a third use for Lotus. It is a drug interaction database that will find conflicts when I type in a list of patient medications. I have the data imported on over 810 different drug interactions, but still have the programming and macro automation to do.