Antacids usually have divalent cations such as magnesium Mg2+ or calcium Ca2+. When antacids are taken at the same time as tetracycline, the magnesium or calcium binds to tetracycline in the intestine and prevent its absorption. You end up having less drug in your system than expected which makes treatment less effective.
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Antacids usually have divalent cations such as magnesium Mg2+ or calcium Ca2+. When antacids are taken at the same time as tetracycline, the magnesium or calcium binds to tetracycline in the intestine and prevent its absorption. You end up having less drug in your system than expected which makes treatment less effective.