One of my favourite interpretations of the theme so far! I love the concept!
I think that one thing I might change is to combine the list of beneficial effects and negative effects into one list, and ask the player whether a medicine improves or makes a particular effect worse. It wasn't clear for example, what the difference was between 'reduced anxiety', normal, and 'increased anxiety' - as far as I could tell, the rat was always scared of the cat except when the 'reduced anxiety' medicine was given.