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Pentasa (mesalamine) Controlled-Release Capsules
Detailed View: Safety Labeling Changes Approved By FDA Center for Drug Evaluation and Research (CDER)
WARNINGS AND PRECAUTIONS
Interference with Laboratory Tests
- Use of mesalamine may lead to spuriously elevated test results when measuring urinary normetanephrine by liquid chromatography with electrochemical detection, because of the similarity in the chromatograms of normetanephrine and mesalamine’s main metabolite, Nacetylaminosalicylic acid (N-Ac-5-ASA). An alternative, selective assay for normetanephrine should be considered.