The formulation and the compounding ratio of the medicines were designed in such a way it satisfy particular requirement of the people. Generic viagra is one such which originally hit the market in late 90s targeting the males to treat their impotence. All the miracles are done by the chemical substance named sildenafil present in it. It is actually a citrate based which promotes the blood flow rate to the penis region which indirectly stimulate the sense of the males to the making them to feel more energetic and helps them. They are very cheap and are available throughout the world.

The interest of people towards these products can be easily identified from the selling rate of viagra online. Yet another medicine which is found to treat the same problem is generic cialis. Generic cialis are accepted by the FDA authorities this is the main reason for attaining popularity among people of all class. Another important advantage of this drug is that they show its immense power for a period of up to 36 hours with out offering any time period restrictions. Till now no other drug has assured the user this perfect level of efficiency but cialis is completely with in such quoted thresh hold limit all the time.