Simvastatin ammonium salt is primarily used in the pharmaceutical industry as an active ingredient in medications designed to lower cholesterol levels. It works by inhibiting the enzyme HMG-CoA reductase, which plays a key role in cholesterol production in the liver. This makes it effective in treating conditions like hypercholesterolemia and preventing cardiovascular diseases such as heart attacks and strokes. Additionally, it is utilized in research studies to explore its potential effects on various metabolic disorders and its role in reducing inflammation or oxidative stress. Its use is strictly regulated, requiring medical supervision to manage dosage and monitor potential side effects.