Hi John,
You can open up the script writer for the patient (click "Write Scripts" from the chart, or right click on the patients name from the Patient List and select "Medications & E-Prescribing") and click on the medication on the list. From here click the "History" button. This will display all the history for that med, including date first prescribed, any refills done by the office, and when it was discontinued and the reason.
Please PM me if you have any quesitons.