Changing the acidity of gastric juice, during the use of antacids, can lead to a decrease in the rate and extent of absorption of other drugs, while taking, so drugs should be taken 1-2 hours before or after taking antacid preparations.
Antibiotics of the tetracycline series, fluoroquinolones, cardiac glycosides, levothyroxine, iron preparations, fluorides, phosphates - with simultaneous use of antacids reduce the absorption of these drugs.
Thiazide diuretics - while concomitant administration with antacids should regularly monitor the concentration of calcium in the blood serum.