The medicines and ailments generally come in opposites. Each ailment has a medicine that will make it better and another that will make it worse.
An antipyretic is an anti-fever medicine. For the game, I chose 'propyretic' for the opposite (for curing chills); there seemed to be a brand name 'Propyretic' which isn't related, but I couldn't find a better name.
Laxatives and binders probably need no explanation, but just in case, they cure constipation and diarrhoea respectively.
Antiblobotics is my take on antibiotics, for curing (bacterial) infections. I did it because my brother once came home from school and told us that because biology was the study of blobs, there were five words for biology: biology, blobology, bloblobogy, bloblobloby and bloblobloblob. It stuck with me because it was so funny. You'll see in amarillion's gif that he got someone so infected that that person actually turned into a blob. (If the gif appears a funny size/shape, you can open the image directly in a new tab and then it looks correct. I assume it's an allegro.cc image header parsing bug or something.)
Problobotics are the opposite and are the silly weapon: who ever wants a medication that creates an infection? There is no opposite ailment for infections that it could cure. In hindsight I suppose I could have played with the idea of limited gut flora, but it's tenuous and wouldn't have been very intuitive. Of course, probiotics do exist in the real word and do help with gut flora, but they don't cause infections.
You can use maximally feverish patients to start fires, but there's also a spontaneous combustion rule in there for the case where there is just too much diarrhoea in the system - to protect the game against unbounded growth and the performance issues that would cause.