One medication used to treat erectile dysfunction is called Tadarise. Both belong to the group of medicines called PDE5 inhibitors, which work by encouraging the dilation of blood vessels. Additionally, they both temporarily increase blood flow to the penis. Along with a glass of water or juice (not grapefruit juice), take your tablets whole. Keep out of the heat and moisture and store at room temperature. Tadalafil is typically used simply once daily. Follow all instructions on the label of your prescription medicine. To cure erectile dysfunction, take it just before having sex, but no more than once every day.