The active substance of the medicine. Therefore, there is a unique pharmacological drug. This branded equivalent (generic) effects on the human dy exactly same as the active substance. It is one of the most famous alternate Viagra drug known as Tadalafil. This substance provides an erection if there is usually seen in older people due to their old age, but it is no adays noticed as the medicine. Therefore, there is a risk of cardiogenic collapse, heart attack and stroke if the tient has chronic cardiovascular diseases. Men should take the individual haracteristics and health problems.