1. A computer-implemented system for administering a drug registry database, comprising: an electronic database for storing a plurality of healthcare claims for a plurality of patients; a user interface for displaying a plurality of new drug/comparator drug pairings, wherein each new drug is added to the database when a threshold number of healthcare claims for the new drug have been received and wherein each comparator drug paired with a new drug that has substantially similar medical indications as the new drug; and receiving a selection of a new drug/comparator drug pairing, and filter parameters input by a user; and an analysis engine for searching the healthcare claims stored in the database to identify a first and second group of patients satisfying the filter parameters input by the user; wherein the first group includes patients with claim data indicating use of the new drug and the second group includes patients with claim data indicating use of the comparator drug; identifying a comparative occurrence of one or more existing medical conditions or new medical conditions in the first and second groups of patients; and calculating a probability value indicating a relative likelihood that a patient taking the new drug will have each of the one or more new or existing medical conditions in comparison to a likelihood that a patient taking the comparator drug will have each of the one or more new or existing medical conditions; wherein the user interface displays each new or existing medical condition and the probability value for the new drug and the comparator drug in accordance with one or more report parameters entered by the user.