effect of antacids
Springer Online Journal Archives 1860-2000
Chemistry and Pharmacology
Abstract The in vitrodissolution profile, in vitroand in vivobuffering characteristics, and single-dose bioavailability of various buffered aspirin tablet formulations were studied. Buffering agents,such as magnesium and aluminum hydroxides (formulations B and C) or magnesium carbonate and aluminum glycinate (formulation D), significantly increased the rate of aspirin dissolution from solid dosage forms as compared to an unbuffered tablet (formulation A). The extent of aspirin absorption was equivalent with all formulations;however, the faster rate of dissolution (t50 and t90)with buffered formulations resulted in earlier and higher peak concentration of salicylate compared to that with unbuffered formulation, following a two-tablet dose in the fasting state. A comparison of the in vivobuffer capacity of a four-tablet dose of formulations B and D was performed in the postcibal state at the time of maximal meal-induced acid secretion, using a radiotelemetry procedure for determination of pH. Formulation B prolonged the interval of elevation of intragastric pH 〉 3 for 32 min as compared to 12 min for D.
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