Dipyrone is widely acknowledged to be an effective antipyretic analgesic with an additional intrinsic spasmolytic activity. It has stood the test of time over the last 75 years in many clinical settings throughout the world. Some 20 years ago, however, concern arose over the implications of isolat- ed reports of agranulocytosis following use of dipyrone. Based on these initial cases the Swedish authorities ordered the withdrawal of the drug from the...