| The side effects are predominantly gastrointestinal, including nausea, diarrhoea, vomiting, abdominal pain and exacerbation of symptoms of colitis. Headache has also been reported. There have been rare reports of leucopenia, neutropenia, agranulocytosis, aplastic anaemia and thrombocytopenia, alopecia, peripheral neuropathy, pancreatitis, abnormalities of hepatic function and hepatitis, myocarditis and pericarditis, allergic and fibrotic lung reactions, lupus erythematosus-like reactions and rash (including urticaria), drug fever, interstitial nephritis and nephrotic syndrome with oral mesalazine treatment, usually reversible on withdrawal. Renal failure, methaemoglobinaemia, eosinophilia, fibrosing alveolitis, myalgia and arthralgia have also been reported. Mesalazine-induced nephrotoxicity should be suspected in patients developing renal dysfunction during treatment. Mesalazine may very rarely be associated with an exacerbation of the symptoms Stevens Johnson syndrome, erythema multiforme and bullous skin reactions including erythema . Other side effects observed with sulphasalazine such as depression of sperm count and function, have not been reported with mesalazine. | |