title: Effect of food coadministration on 5-aminosalicylic acid oral suspension bioavailability.
abstract: Single doses of 1 gm 5-aminosalicylic acid (5-ASA) suspension was administered to 24 healthy volunteers during both fasting and fed conditions. For subjects in a fasting state, plasma 5-ASA and acetyl 5-ASA concentrations peaked rapidly 1 hour after dosing to 14.72 micrograms/ml and 11.4 micrograms/ml, respectively. The elimination half-life of 5-ASA was 51.9 minutes, whereas the acetyl 5-ASA half-life could not be determined. A mean of 78.3% of the dose was excreted in the urine, with 5-ASA accounting for 21.2% of the dose and acetyl 5-ASA accounting for the balance. Only 11.3% of the dose was eliminated in the feces, consisting mostly of acetyl 5-ASA. Food coadministration reduced 5-ASA and acetyl 5-ASA systemic relative bioavailability to 44% and 76%, respectively, compared with the fasting treatment. Urinary excretion of the salicylates was reduced to 46.8%, and fecal salicylate elimination increased almost 100%--to 24.2% of the total dose.
authors.affiliation: Clinical Pharmacology Department, Marion Merrell Dow, Inc., Kansas City, MO 64137.
authors.forename: D K
authors.initials: DK
authors.lastname: Yu
authors.forename: A T
authors.initials: AT
authors.lastname: Elvin
authors.forename: B
authors.initials: B
authors.lastname: Morrill
authors.forename: L S
authors.initials: LS
authors.lastname: Eichmeier
authors.forename: R C
authors.initials: RC
authors.lastname: Lanman
authors.forename: M B
authors.initials: MB
authors.lastname: Lanman
authors.forename: D H
authors.initials: DH
authors.lastname: Giesing
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000636:Aminosalicylic Acids / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics* / Q000652:urine; D001682:Biological Availability; D005243:Feces / Q000032:analysis; D005502:Food; D006801:Humans; D008297:Male; D019804:Mesalamine
chemical_list: D000636:Aminosalicylic Acids; D019804:Mesalamine; C028836:N-acetyl-5-aminosalicylic acid