Interactions between questran-light(cholestyramine) and Bumex (bumetanide)
bumetanide and cholestyramine (Moderate Drug-Drug)
ADJUST DOSING INTERVAL: Limited data have shown that the bioavailability of orally administered furosemide is reduced by 95% during concurrent administration of cholestyramine and by 80% during concurrent administration of colestipol. (These figures are based on data from the area under the plasma concentration-time curve and total urinary elimination data.) These decreases in bioavailability were associated with 77% and 58% reductions in the diuretic response to furosemide. No data are available for bumetanide, torsemide, or ethacrynic acid, but a similar interaction is suspected.
MANAGEMENT: Diuretics should be administered at least 2 to 3 hours before cholestyramine or colestipol. If alternating dosage schedules is ineffective, it may be necessary to increase diuretic dosage during coadministration. Patients should be monitored for altered diuretic efficacy.
