Cystitis and interstitial nephritis related to the use of tiaprofenic acid (Surgam).

We describe a case of concurrent presentation of severe haemorrhagic cystitis and acute interstitial nephritis with eventually lethal outcome, associated with the use of tiaprofenic acid (Surgam), a propionic acid-derived non-steroidal anti-inflammatory drug (NSAID). Although interstitial nephritis and haemorrhagic cystitis are caused by all types of NSAIDs, a higher incidence of interstitial nephritis and especially haemorrhagic cystitis has been described related to propionic acid derivatives. Awareness of this serious adverse effect is important.