Consider a pharmacy information system (as a subsystem of the clinical information systems)

There are many benefits of pharmacy informatics. One of the benefits of pharmacy informatics is order entry into the pharmacy information system. It is used to check if the medication’s dosage and package size matches to physician order. Online order verification, computer supported medication supply, automated label generation are part of benefits. Another benefit is the computerized warning for drug interaction, drug allergies, dosing based on patient’s age and weight, disease state effects allowing prescription depending on patient’s body condition, and lab test interference are available. Also, pharmacy informatics provides an inventory and purchasing management, convenient to keep track of stocks. Reporting function is very useful to determine the pattern of medical usage of patients or physicians, to view the workload of transactions for certain period of time and to view financial costing to report revenue and set budget. Finally, computerized pharmacy billing is another good benefit of pharmacy informatics. Most of pharmacies have computerized billing system to track patient admissions, current location and some patient charges are sent from the pharmacy.

In fact, more of these questions can be answered using the information found here: http://www.clinfowiki.org/wiki/index.php/Pharmacy_Informatics

Hope this helps you a little