I agree with Zpack - Pyxis is the best & HBOC is great as well.
The computerized dispensing system needs to interface seemlessly not just with the pharmacy database, but also with the laboratory database & patient demographics.
For pharmacy, particularly.....you need to get the movement of patients rapidly - if your pt moves from ICU to a medsurg unit or vice versa....you need to get that info when nursing inputs it - not just when the info gets to admissions/records.
I've only used Pyxis & Omnicell - Pyxis is easiest, but still has problems with multiusers requirining medications in short periods of time - OR for example. Omnicell is better for materials management - IV fluids, dressings, tubings, etc....
Also...First DataBank is the largest provider of pharmacy data for both inpt & retail I think. (Its also a great employer for foreign graduates!!)