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Antacids that contain calcium carbonatemay decrease the serum concentration of:
Correct Answer: D
* Calcium carbonate binds to doxycycline, preventing its absorption, reducing its effectiveness. * Doxycycline is a tetracycline antibiotic used for bacterial infections. * Patients should take doxycycline 1-2 hours before or after antacids. #Reference:FDA Drug Interaction Guidelines, PTCB Medication Absorption Guide.