Viagra refers to the PDE5 inhibitor which is prescribed for treating the erectile dysfunction in men. How does it work? Viagra makes the arterial muscles in the penis relax, what causes its blood engagement and, thus, erection. During the last time Viagra has been the most popular medication for treating impotence because of its quick effectiveness and safety. Yet, as most of the medications, it also has some side effects. Viagra may cause upset stomach, sweating, flushing and headache. There were also some rare cases of temporary blindness and blurred vision. Yet, Viagra was proved to be safe, that is why if you don't have problems with the health such as high blood pressure, heart disease, diabetes and others, you can buy Viagra without the prescription. The price of Viagra may vary. So, in order to find cheap Viagra, check it online and compare prices on different pharmacological websites. Among the cheaper variants you may also find Viagra Generic. It is not a problem to buy Viagra online, yet, it is recommended to consult the doctor and discuss your state of health and diseases or ailments if there any. Only after that the doctor will tell if you can take this medication and what dosage is better for you.