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Effect of cimetidine on quinidine bioavailability.

Elevations in quinidine steady-state serum concentrations have been reported in patients who received cimetidine concurrently. Studies in normal volunteers have shown that areas under the serum concentration-time curve of orally administered quinidine are higher when quinidine is given during chronic cimetidine therapy as compared to under control conditions. The mechanism for this interaction is generally ascribed to decreased hepatic clearance as a consequence of enzyme inhibition. In this study, we show that cimetidine also decreases the bioavailable fraction of quinidine.