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  • Title: Effect of antacid suspension on the pharmacokinetics of ibuprofen.
    Author: Gontarz N, Small RE, Comstock TJ, Stalker DJ, Johnson SM, Willis HE.
    Journal: Clin Pharm; 1987 May; 6(5):413-6. PubMed ID: 3665393.
    Abstract:
    The effect of antacid administration on the pharmacokinetics of ibuprofen was evaluated in a randomized, crossover study of eight healthy volunteers. Doses of 62 mL of aluminum and magnesium hydroxide suspension and single doses of ibuprofen 400 mg were used. Subjects received each of the following treatments at one-week intervals: ibuprofen alone; ibuprofen administered concurrently with one dose of antacid; antacid administered one hour after the ibuprofen dose; and antacid administered concurrently with the ibuprofen dose, plus three more antacid doses given every five hours. Blood samples were taken at various time intervals up to 24 hours after the ibuprofen dose. Serum samples were assayed for ibuprofen content using high-performance liquid chromatography. Values for AUC, Cmax, tmax, and k were not significantly different among treatment groups. The ranges of mean (+/- S.D.) values were 113.97 +/- 21.5 to 127.53 +/- 29.3 micrograms.hr/mL for AUC, 35.30 +/- 6.40 to 41.00 +/- 10.00 micrograms/mL for Cmax, 0.95 +/- 0.30 to 1.28 +/- 0.54 hr for tmax, and 0.346 +/- 0.026 to 0.388 +/- 0.040 hr-1 for k. For the doses used, concurrent administration of aluminum and magnesium hydroxide suspension and ibuprofen does not alter ibuprofen pharmacokinetics.
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