Modula 5 mg contains the active ingredient tadalafil, which is a phosphodiesterase type 5 (PDE5) inhibitor used to treat erectile dysfunction (ED) in men. It is one of the lower doses of tadalafil available, typically prescribed for individuals who require a lower strength of the medication. Tadalafil, the active ingredient in Modula 5 mg, works by increasing blood flow to the during stimulation. This helps men achieve and maintain an erection sufficient for satisfactory activity. Tadalafil inhibits the action of phosphodiesterase type 5 (PDE5) enzymes in the body. By blocking PDE5, tadalafil increases the levels of cyclic guanosine monophosphate (cGMP), a signaling molecule that promotes relaxation of smooth muscle cells in the and dilation of blood vessels. This allows for increased blood flow to the erectile tissue, leading to an erection when the individual is aroused.