It is obvious that this author put a huge amount of time and effort into the research of this book, and for that, kudos. In my opinion though, the level of detail and redundancy gets to a point where it detracts from the message. As a pharmacist, I am no stranger to reading detailed and complicated literature, but I generally do not want to put forth the same amount of effort when reading for pleasure.
I kept waiting for the part in the book where there would be some kind of explanation about how most of these "antidotes", regardless of whether they were promoted by physicians or charlatans, were bogus. I had hoped to get a little more information on the antidotes themselves- what they actually contained, if there was evidence of them being efficacious outside of trials performed by the creators (or members of royalty wanting to show off), etc. The vast majority of "physicians" during renaissance times were essentially charlatans anyway as no one really knew what they were doing up until the 19th century. When someone who actually published claims to having knowledge on what unicorns looked like and what they ate was cited as a "physician", it cheapened the term for the entire book. I cannot say I see any doctors prescribing theriac, unicorn horns, or bezoar stones in my day-to-day practice.
Overall, this was an interesting book to read and I learned some new things from it. For me it was the kind of book to read small amounts of over time instead of all of it in a few days.