Tadarise 2.5 medicine contains the active ingredient Tadalafil. This drug works by inhibiting the action of the enzyme phosphodiesterase-5 to widen or relax blood vessels and improve blood flow to the penis. An erection is caused by increased blood flow. The drug will not only help the erection process, but sexual stimulation is necessary for it to work. The effect of this medicine usually lasts for 3-4 hours. You should use this medicine only as per the doctor's advice. If this medicine is used on an empty stomach or with light food, you can get very fast results of the medicine.