What to dispense when you get a prescription for these drugs? (Different salts)

Doxycycline: Dispense monohydrate or hyclate? Prednisolone liquid, could you dispense Prednisolone sodium phosphate? Forms of erythromycin: I know there are differences in absorption, but which form do you dispense if prescription doesn't specify? Anyone have a good summary of the different forms and what's different about each? Any other similar drug situations please feel free to post, such as metoprolol succinate being extended release and tartrate being immediate release is an... What to dispense when you get a prescription for these drugs? (Different salts)
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums