Erectile dysfunction(ED), also known as "impotence" is the repeated inability to get or keep an erection for sexual intercourse. ED, can be a total inability to achieve erection, an inconsistent ability to do so, or a tendency to sustain only briefly. These different types make defining ED and estimating its spread, difficult. Estimates range from 15 million to 30 million, depending on the definition used. There has been a gradual decrease presumably, since treatments such as vacuum devices and drugs have become more widely available and discussing Erectile Dysfunction became accepted.
The most talked-about advance was the introduction of the oral drug sildenafil citrate (Viagra) in March 1998. In older men, ED usually has a physical cause, such as disease, injury, or side effects of drugs.
ED is treatable at any age, and awareness of this fact has been growing.

Patient Background:
Medical and sexual histories help define the scale and type of ED. A medical history will show diseases that lead to ED, while a simple description of sexual activity will show those causes.
Physical Examination:
Physical examination can also give clues to these problems.
Laboratory Tests:
Several laboratory tests can help diagnose ED. Tests for general diseases include blood counts, urinalysis, lipid profile, and measurements of creatinine and liver enzymes.
Other Tests:
Certain other tests may be required depending on the Doctor's decision
Psychosocial Examination:
Psychosocial examination, by using an interview or a questionnaire would show psychological factors responsible for the ailment. A talk with the man's sexual partner may also reveal expectations and perceptions during sexual intercourse.

In March 1998, the Food and Drug Administration (FDA) approved Viagra, Viagra is taken an hour before sexual activity. While Viagra improves the response to sexual stimulation these should only be administered in consultation with your Doctor.

You can buy Viagra from Viagra online where you can avail of cheap Viagra and discount Viagra. But you must remember nothing is to be taken without your Doctor's recommendation, do those and you'll be just fine!