Which ingredient in some OTC antacids can accumulate with kidney disease and should be used with caution?

Prepare effectively for the Over-the-Counter Drugs, Herbal Supplements, Vitamins, and Minerals Test. Engage with detailed flashcards and interactive multiple-choice questions, accompanied by informative hints and explanations. Get exam-ready with confidence!

In kidney disease, substances that are normally cleared by the kidneys can build up in the body. Aluminum-containing antacids are especially problematic because aluminum is poorly excreted when renal function is reduced, allowing it to accumulate over time. This buildup can lead to aluminum toxicity, affecting bones and the nervous system (for example, bone disorders like osteomalacia and, in severe cases, neurologic effects). That’s why aluminum-containing antacids are used with great caution or avoided in patients with kidney disease.

Other common antacid ingredients carry their own risks in kidney disease, but not primarily due to accumulation. Magnesium hydroxide can raise magnesium levels when the kidneys can’t clear it, leading to hypermagnesemia. Calcium carbonate may cause hypercalcemia and related problems, including vascular calcification, especially in patients with impaired renal function. Sodium bicarbonate adds sodium and can worsen fluid overload and hypertension.