One common drug used to treat male erectile dysfunction (ED) is Vidalista 20 mg.  It has 20 mg of Tadalafil, a PDE5 inhibitor that helps men get and keep a hard erection by increasing blood flow to the penis during sexual stimulation.  Tadalafil is well-known for having a long half-life of up to 36 hours, which makes it possible for sexual activity to be more flexible and spontaneous....