That's a good observation, Kimba. IIRC, certain meds for Parkinson's, reduce "inhibition", meaning that potentially where a person who's thinking about suicide will otherwise chose not to, the lack of inhibition could then allow the scale to tip the other way. Just speculation of course, but there were a plethora of circumstances involved that ultimately made Robin think there was no way out.
This has always been an issue with me, as a Medical professional.....that of medications. So many studies are done on side effects of certain medications, but not near enough studies are performed on the side effects when certain medications for differing diagnoses are thrown togehter