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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Once versus divided daily dosing with delayed-release mesalazine: a study of tissue drug concentrations and standard pharmacokinetic parameters.
Alimentary Pharmacology & Therapeutics 2001 January
BACKGROUND: Delayed-release mesalazine is traditionally taken as three divided doses. However, it is well-recognized that dosing frequency has a significant impact on compliance and that once daily dosing is preferable.
METHODS: We measured serum, urinary, faecal and rectal tissue concentrations of 5-aminosalicylic acid and N-acetyl 5-aminosalicylic acid in 24 healthy volunteers following dosing with delayed-release mesalazine, 1.2 g or 2.4 g daily, given as either a single daily dose at 08:00 hours or in three divided doses at 08:00, 13:00 and 18:00 hours.
RESULTS: Urinary and faecal excretion and rectal tissue concentrations of 5-aminosalicylic acid and N-acetyl 5-aminosalicylic acid were similar following single or divided daily dosing, at both doses studied. Peak serum concentrations were found at 06:00-09:00 following divided dosing and at 17:00-20:00 following once daily dosing. However, peak and trough serum levels and serum area under curve values (AUC) were similar with both regimens and at both doses.
CONCLUSIONS: Urinary, faecal and rectal tissue concentrations are similar following single or divided daily dosing. Minor differences in serum levels were apparent but maximum, minimum and AUC values were similar. Clinical trials should examine the efficacy and toxicity of once daily dosing in patients with ulcerative colitis.
METHODS: We measured serum, urinary, faecal and rectal tissue concentrations of 5-aminosalicylic acid and N-acetyl 5-aminosalicylic acid in 24 healthy volunteers following dosing with delayed-release mesalazine, 1.2 g or 2.4 g daily, given as either a single daily dose at 08:00 hours or in three divided doses at 08:00, 13:00 and 18:00 hours.
RESULTS: Urinary and faecal excretion and rectal tissue concentrations of 5-aminosalicylic acid and N-acetyl 5-aminosalicylic acid were similar following single or divided daily dosing, at both doses studied. Peak serum concentrations were found at 06:00-09:00 following divided dosing and at 17:00-20:00 following once daily dosing. However, peak and trough serum levels and serum area under curve values (AUC) were similar with both regimens and at both doses.
CONCLUSIONS: Urinary, faecal and rectal tissue concentrations are similar following single or divided daily dosing. Minor differences in serum levels were apparent but maximum, minimum and AUC values were similar. Clinical trials should examine the efficacy and toxicity of once daily dosing in patients with ulcerative colitis.
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