View cart “Prebel-50 Pregabalin capsules IP 50 Mgack Size 20X1X4TABS Country of Origin Made in India Sildenafil is a phosphodiesterase-5 (PDE-5) inhibitor. It works by relaxing the blood vessels in your penis, thereby increasing blood flow into the penis on sexual stimulation. This helps you achieve and maintain a hard, erect penis suitable for sexual activity.” has been added to your cart.