I'm not convinced that knowing which drugs he had will take us any further forward in terms of a definitive answer. You only have to look at the list of potential side-effects of most drugs. Not only does this list seem to be endless but also the same side-effects appear across many different types of drugs.
Sometimes the possible side-effects seem contradictory. One drug I use says 'may cause high blood pressure'....'may cause low blood pressure'!