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Mesalazine >> Precautions
PRECAUTIONS
Mesalazine
CAS Registry Number 89-57-6
General
Caution should be exercised if Mesalazine is administered to patients
with impaired hepatic function. Mesalamine has been associated with an acute
intolerance syndrome that may be difficult to distinguish from a flare of
inflammatory bowel disease. Although the exact frequency of occurrence
cannot be ascertained, it has occurred in 3% of patients in controlled
clinical trials of mesalamine or sulfasalazine. Symptoms include cramping,
acute abdominal pain and bloody diarrhea, sometimes fever, headache, and
rash. If acute intolerance syndrome is suspected, prompt withdrawal is
required. If a rechallenge is performed later in order to validate the
hypersensitivity, it should be carried out under close medical supervision
at reduced dose and only if clearly needed.
Renal
Caution should be exercised if Mesalazine is administered to patients
with impaired renal function. Single reports of nephrotic syndrome and
interstitial nephritis associated with mesalamine therapy have been
described in the foreign literature. There have been rare reports of
interstitial nephritis in patients receiving Mesalazine . In animal studies,
a 13-week oral toxicity study in mice and 13-week and 52-week oral toxicity
studies in rats and cynomolgus monkeys have shown the kidney to be the major
target organ of mesalamine toxicity. Oral daily doses of 2400 mg/kg in mice
and 1150 mg/kg in rats produced renal lesions including granular and hyaline
casts, tubular degeneration, tubular dilation, renal infarct, papillary
necrosis, tubular necrosis, and interstitial nephritis. In cynomolgus
monkeys, oral daily doses of 250 mg/kg or higher produced nephrosis,
papillary edema, and interstitial fibrosis. Patients with preexisting renal
disease, increased BUN or serum creatinine, or proteinuria should be
carefully monitored, especially during the initial phase of treatment.
Mesalamine-induced nephrotoxicity should be suspected in patients developing
renal dysfunction during treatment.
Pediatric Use
Safety and efficacy of Mesalazine in pediatric patients have not been
established.
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