Unfortunately not my own review, I'm greatly backlogged, and my apologies to the author! However, I heartily endorse this BMCR review by none other than Arthur Keaveney.
The book [should] find a wide audience and serve as an attractive introduction to its subject. The title Poison King
would seem to suggest that perhaps Mayor, who is a noted authority in
the field of ancient poisons, was first drawn to Mithridates because
he, too, was a very great expert in such matters. However, Mayor goes
far beyond such specialised interests and presents us with a richly
detailed narrative of the king and his doings in which she constantly
strives to put before us Mithridates' view of events.
My own (minor) reservation is that there is some repetition that might have been avoided and could have made for a smoother reading. Nonetheless, I enjoyed the book immensely during my first read-through.
The Poison King: The Life and Legend of Mithradates, Rome's Deadliest Enemy
Hardcover: 472 pages
Princeton University Press (September 28, 2009)
Also by Adrienne Mayor, and another good read:
Greek Fire, Poison Arrows, and Scorpion Bombs:
Biological & Chemical Warfare in the Ancient World
Paperback: 336 pages
Overlook TP 2008