Atenolol, iron salts, quinolones (such as norfloxacin): Concurrent administration may decrease levels of these drugs. Use together cau-tiously; monitor drug levels.
Calcium channel blockers (verapamil): Calcium may antagonize the therapeutic effects of these drugs. Avoid concomitant use.
Calcium carbonates, phosphates, sulfates, tar-frates Progressive hypercalcemia may occur. Calcium should not be physically mixed with these drugs, especially at high concentrations.
Cardiac glycoside, digitalis: Increases digitalis toxicity when used together. Administer calcium very cautiously, if at all, to digitalized patients.
Magnesium: Calcium competes with magnesium; may compete for absorption, thus decreasing amount of bioavailable magnesium. Use together cautiously.
Tetracycline: Concurrent administration of oral calcium decreases therapeutic effect of tetracy-cline. Use together cautiously. |