Magnesium Sulfate

**Magnesium sulfate**, commonly known as **Epsom salt**, is a versatile compound used in veterinary medicine for both systemic and localized conditions. * **Systemic Use:** Administered intravenously to treat hypomagnesemia, manage life-threatening arrhythmias (such as torsades de pointes), and act as a muscle relaxant or anticonvulsant in specific toxicities or conditions. * **Gastrointestinal Use:** When administered orally, it acts as a potent osmotic cathartic (laxative) to help clear the intestinal tract. * **Topical Use:** Frequently used as a hyperosmolar soak or poultice to draw out localized infections, soothe sore muscles, or treat hoof abscesses in large animals. > **Clinical Pearl:** While highly effective, systemic administration requires careful monitoring of cardiovascular and respiratory status due to the risk of profound CNS and respiratory depression at high doses.

กลไกการออกฤทธิ์: Magnesium is a critical intracellular cation and a cofactor for over 300 enzymatic reactions. * **Neuromuscular & CNS:** Magnesium competes with calcium at the motor endplate, decreasing acetylcholine release and reducing motor nerve impulse transmission, leading to muscle relaxation and CNS depression. * **Cardiovascular:** Acts as a physiological calcium channel blocker, slowing sinoatrial node impulse formation and prolonging conduction time → **antiarrhythmic effect**. * **Gastrointestinal:** Poorly absorbed in the GI tract, it creates an osmotic gradient that draws water into the intestinal lumen → **osmotic cathartic effect**. * **Topical:** Creates a hypertonic environment that draws out fluid and exudate from localized swellings or abscesses.

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