RT Journal Article SR Electronic T1 Mesalazine induced interstitial nephritis. JF Gut JO Gut FD BMJ Publishing Group Ltd and British Society of Gastroenterology SP 1493 OP 1496 DO 10.1136/gut.35.10.1493 VO 35 IS 10 A1 Thuluvath, P J A1 Ninkovic, M A1 Calam, J A1 Anderson, M YR 1994 UL http://gut.bmj.com/content/35/10/1493.abstract AB 5-Aminosalicylic acid (5-ASA) has structural similarities to both phenacetin and aspirin, which are known to cause 'analgesic nephropathy'. Because of the increasing use of 5-ASA, this paper draws attention to two cases of severe interstitial nephritis resulting from 5-ASA and emphasises the importance of monitoring renal functions of patients with inflammatory bowel diseases who are receiving 5-ASA preparations.