Tadarise 20 mg is a medication that can be used to treat erectile dysfunction in men. Its primary ingredient is tadalafil, an inhibitor of phosphodiesterase type 5 (PDE5). Tadalafil increases blood flow to the penis during sexual stimulation, which makes it easier to get and maintain an erection.  Twenty milligrams of tadarise are usually taken 30 to 60 minutes before having intercourse. The effects of tadalafil may last for up to 36 hours, allowing you extra time for sexual activity. It's important to keep in mind that the medicine needs sexual stimulation to function.