Non-steroidal anti-inflammatory drugs (NSAIDs) are among the mostfrequently- prescribed drugs in the Western world. During the past decade a large number of new compounds were marketed, some of which had to be withdrawn after a short while because of adverse drug reactions. These experiences led to an under- standing that a complete picture of the safety of these drugs can only be obtained after their introduction into the marketplace. Differentmethods ofpost-marketing surveillance (PMS) serve as important tools for monitoring the frequency of adverse reactions and for generating and...