Sildenafil Mesylate is primarily used in the treatment of erectile dysfunction (ED) in men. It works by enhancing blood flow to the penis, facilitating the ability to achieve and maintain an erection during sexual stimulation. This makes it a key medication for improving sexual performance and confidence in individuals with ED.

Additionally, Sildenafil Mesylate is also employed in managing pulmonary arterial hypertension (PAH). It helps relax the blood vessels in the lungs, reducing the pressure on the heart and improving the ability to exercise. This application is crucial for patients with PAH, as it aids in alleviating symptoms like shortness of breath and fatigue, thereby enhancing their quality of life.

The compound is often formulated into oral tablets or other dosage forms for ease of administration. Its effectiveness and relatively rapid onset of action make it a preferred choice for both conditions. However, it should be used under medical supervision to ensure safety and to avoid potential side effects or interactions with other medications.