This module enables you to list all the purchases of a given product. You can sort the results by clicking on the appropriate column heading. You can also export the data to a CSV file, either page at a time, or (by clicking the 'Show all records' link at the bottom) all records.
It is accessed either via the top menu via Store administration|Reports|Who Bought What or directly via http://www.openvpms.org/admin/store/reports/uc_who_bought_what
Note that the CSV file contains more data than is displayed on the screen. In particular it shows the 'billing_company' (in column Z) - this should contain the name of the practice.