For those of you who have are unfamiliar with the works of Arthur Hailey, he writes massive tomes about various industries, as seen from both the very bottom (for example, assembly line worker living below the poverty line) and very top (a lot of time spent in the boardroom). Well known titles in this regard include "Wheels" (the car industry); "Airport" (as the name suggests); "Overload" (the power industry); "The Money Changers" (highest finance); and this one: the drug (err, LEGAL pharmaceuticals, that is!) industry.
The plot is very simple. It follows the life of a young woman, who starts as a lowly salesman (when drug salesmen really were very low!). Through a series of perhaps reasonably plausible adventures, she ultimately becomes..... well, that would spoil the story, but if you've survived this far it won't come as a surprise that she moves very high up indeed.
A few of Arthur Hailey's works have become movies; in fact "Airport" started a whole genre. What makes "Strong Medicine" quite unique is that (a) it follows the book reasonably closely; and (b) it is the only movie-from-a-book that is actually _better_ than the book; and the book is indeed very very good.
Patrick Duffy surprised me. I'd only ever seen him before as Bobby Ewing from "Dallas"; in this movie his performance was vastly better.