All of the following drugs alter calcium hemostasis except-
**Core Concept**
Calcium homeostasis is a vital physiological process that involves the regulation of calcium levels in the body. This process is crucial for maintaining normal muscle and nerve function, blood clotting, and bone metabolism. Alterations in calcium homeostasis can lead to various clinical disorders, including hypocalcemia and hypercalcemia.
**Why the Correct Answer is Right**
Indomethacin is a nonsteroidal anti-inflammatory drug (NSAID) that primarily works by inhibiting the enzyme cyclooxygenase (COX), which is involved in the production of prostaglandins. Prostaglandins play a role in regulating calcium levels by influencing the activity of osteoclasts and osteoblasts in bone metabolism. However, indomethacin does not directly alter calcium hemostasis. Unlike other options, indomethacin does not have a significant effect on calcium levels or bone metabolism.
**Why Each Wrong Option is Incorrect**
**Option A:** Fluoride is known to have a significant effect on bone metabolism by promoting osteoblastic activity and increasing bone density. It can also alter calcium hemostasis by increasing the absorption of calcium from the gut and reducing urinary excretion.
**Option C:** Mithramycin is a bisphosphonate that inhibits bone resorption by reducing osteoclastic activity, leading to an increase in bone density and a decrease in calcium levels in the blood.
**Option D:** Thiazides are a class of diuretics that can cause hypercalcemia by increasing the reabsorption of calcium in the kidneys and reducing its excretion in the urine.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that alterations in calcium homeostasis can lead to various clinical disorders, including hypocalcemia (low calcium levels) and hypercalcemia (high calcium levels). These disorders can manifest with symptoms such as muscle cramps, tetany, and cardiac arrhythmias.
**Correct Answer:**
✓ Correct Answer: B. Indomethacin