Vidalista 20 (Tadalafil) is the Active Ingredient in Generic Cialis and is a type of PDE5 inhibitor (pulmonary hypertension) that helps men with ED get and keep erections, improving s*xual function with harder and longer-lasting erections. The US FDA has also approved this drug is also used to cure the signs and symptoms of benign prostatic hyperplasia (BPH) as well of both ED and the signs and symptoms of BPH (ED/BPH) where the two conditions co-exist.