The Modula pill is actively composed of tadalafil, which is a potent PDE5 inhibitor drug. Therefore, this drug works on the cellular and enzymatic levels. In short, the drug stops the function or secretion of an enzyme called phosphodiesterase-5 (PDE5). To inhibit the degradation of vasodilator called cyclic Guanosine Monophosphate. After this reaction, the body releases nitric oxide in a higher amount, which is also a vasodilator that works to boosts blood flow to the organ and relaxes penile muscles. Both the vasodilators work together to dilate arteries and to relax muscles, which finally leads to an erection. Please note that Modula works only in the presence of sexual stimulation.