Which minerals do bisphosphonates have high binding affinity for in the intestinal tract?

Which minerals do bisphosphonates have high binding affinity for in the intestinal tract?

• A. Calcium, Iron, and Magnesium
• B. Sodium and Potassium
• C. Zinc and Copper
• D. Phosphate alone

Answer: (A)

Bisphosphonates bind tightly to divalent and trivalent metal ions in the gut, forming insoluble complexes that drastically reduce absorption. The minerals that show the strongest binding in the intestinal tract are calcium, iron, and magnesium, so those are the ones listed in the correct choice. This is why taking bisphosphonates with calcium- or iron-containing foods or supplements (or with antacids or dairy) markedly decreases their absorption. Monovalent ions like sodium and potassium don’t form as strong complexes, which is why that option isn’t correct. Zinc and copper aren’t the main contributors to the absorption block, and phosphate isn’t the primary factor here. For best absorption, take bisphosphonates on an empty stomach with water and avoid concurrent calcium, iron, or magnesium products for several hours.

Bisphosphonates bind tightly to divalent and trivalent metal ions in the gut, forming insoluble complexes that drastically reduce absorption. The minerals that show the strongest binding in the intestinal tract are calcium, iron, and magnesium, so those are the ones listed in the correct choice. This is why taking bisphosphonates with calcium- or iron-containing foods or supplements (or with antacids or dairy) markedly decreases their absorption. Monovalent ions like sodium and potassium don’t form as strong complexes, which is why that option isn’t correct. Zinc and copper aren’t the main contributors to the absorption block, and phosphate isn’t the primary factor here. For best absorption, take bisphosphonates on an empty stomach with water and avoid concurrent calcium, iron, or magnesium products for several hours.