For human being the erectility is decreased as age increased, so viagra is used to cure the erectility dysfunctions of the human being. The generic viagra is used for increase the flow of blood across the penis. This medicine is otherwise known as sildenafil. The procedure involved in the using of viagra is very simple. First step is swallowing the tablet and drink some water, before you are having sex. The tablet is taking some time for working it is about 30 to 40 minutes approximately. The tablet does its function continuously for 4 hours.

The optimum dosage is preferable because if you consume more dosage then it leads to dangerous side effects. The optimum dosage for the human being is from 30ml to 70 ml, if it crosses then sure side effects will affect the person. Before going to taking the viagra, please consult the doctor whether this medicine will suitable for your body condition or not. In most of the cases, person does not read the manual carefully. A similar kinds of tablet is generic cialis, the function of the cialis is varies little bit with the viagra. People can easily buy the viagra using viagra online services. The cost of the tablet is not also high when you buy on the online.