Tadalista 20 is a drug to treat erectile dysfunction. It works by relaxing the penis and it opens up when you’re aroused, so you’re able to have an erection. When taken as directed, the main active ingredient in Tadalista is tadalafil, a PDE5 inhibitor. The drug works by interfering with PDE5 activity and increasing blood flow to the penis in order to produce an erection. You can take the medicine at a dosage of 10 mg or 20 mg. If the treatment is effective, your doctor can increase your dose up to a Tadalista 40 mg.