Used primarily in the pharmaceutical industry as an active ingredient in medications for the treatment of erectile dysfunction and pulmonary arterial hypertension. It functions by inhibiting phosphodiesterase type 5 (PDE5), which increases blood flow to certain areas of the body. This compound supports smooth muscle relaxation in the penile and pulmonary regions, facilitating improved erectile response and reduced pulmonary vascular resistance. It is formulated in oral dosage forms and is designed for on-demand or chronic use depending on the condition treated.