Tetracycline should be taken relative to meals?

• A. 1 hour before or 2 hours after meals
• B. With meals
• C. Right before bedtime
• D. Only with dairy

Answer: (A)

Tetracycline absorption is inhibited by minerals in food because it forms chelates with calcium, magnesium, iron, and other metals found in dairy products and many fortified foods. When these minerals bind the drug in the gut, the formed compound is poorly absorbed, reducing the amount that reaches the bloodstream. To maximize absorption, it should be taken on an empty stomach—about one hour before or two hours after meals—with a full glass of water. This timing avoids the interactions that dairy and mineral-rich foods cause. If stomach upset occurs, a small amount of food can be used, but the drug should still be spaced away from dairy and mineral supplements as much as possible.