Fildena CT 50 mg contains sildenafil citrate, a phosphodiesterase type 5 (PDE5) inhibitor, which is primarily used for erectile dysfunction but can also benefit individuals with pulmonary arterial hypertension (PAH). In PAH, the blood vessels in the lungs become narrowed, increasing pressure in the pulmonary arteries and making it harder for the heart to pump blood. Sildenafil works by relaxing the smooth muscles of these pulmonary blood vessels, causing vasodilation. This reduces pulmonary vascular resistance and lowers the elevated blood pressure in the lungs, improving blood flow. As a result, patients may experience better exercise tolerance, reduced shortness of breath, and overall improvement in symptoms related to PAH. Regular monitoring by a healthcare professional is essential to ensure safe and effective use for this condition.