In AZ, John Musil (and I can tell the story of how he got into business). In MN, Bruce Paddock although I don't know him personally. Nationally, Bernie Marcus who my father knew as a very, very unhappy Rutgers student and Rite-Aid pharmacist before he founded Home Depot. He and Dworkin (Revco) got their start the same way, getting screwed over hard in a tight labor market. Unfortunately in Dworkin's case, that happened at the end of his career to and the story is very politically incorrect.
My guess of the the common traits all the really rich pharmacists is:
1. They hated the work of a chain druggist (or distributor business in the case of Rexall) and were screwed over by them.
2. They made peanuts for years before making it big.
3. They had a family that believed in them. (John Musil in particular had really decent parents who supported him in his odd career decision).
4. They were motivated not by money, but by power.
The richest hospital pharmacist who worked as one double-dealed his way using his procurement knowledge and ties to the Chicago scene to make a fortune in legal arbitrage while still in practice (>$650M or so). If you're been in the Chicago scene, it's probable that if you worked in hospital pharmacy in Chicago, you would have encountered him and know his story. His name ends in a vowel.