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For most men erectile dysfunction (E.D.) is a natural phenomenon of old age and it is a common belief that like sagging facial skin or graying of hair, E.D .comes with old age. Well, it is not necessarily so E.D. is a medical condition and with the advancement of medical science can be treated.

E.D. also known as impotence has been defined as the consistent inability to attain and maintain an erection sufficient for sexual intercourse.

The sad fact is that only about 10% of men seek help. So 90% of men out there still aren't getting treated for impotence, says Irwin Goldstein, MD, director of the institute for Sexual Medicine at the Boston University Medical Center and a leader of the Massachusetts Male Aging Study.

In the early days of Viagra (the first erectile dysfunction drug) -- many men got turned off -- largely because reports of heart attack that were shown later not to be related to the drug. Today, Viagra carries only an advisory for people with high blood pressure who are taking particular types of blood pressure-lowering medication, and patients with angina or heart disease who take nitrates.

However to overcome this drawback of heart ailments being caused by Viagra, Levitra a drug developed by Bayer and GlaxoSmithKline in 2003 was introduced to alleviate this fear.

Both Viagra and Levitra work by inhibiting the PDE5 enzyme. Viagra takes effect in about 30 minutes and the effects last about 4 hours. Cialis reaches maximum concentration in 24 hours, and the effects last for about 3 days, says Goldstein.

Levitra is faster-acting, reaching maximum concentration in 30 to 40 minutes, with the effects lasting about 16 hours.

The non-trade name for levitra. is Vardenafil. Vardenafil, an oral treatment that increases inflow and retention of blood in the penis, is in the same class of drugs as Sildenafil and tadalafil designed to improve erectile function.

Erectile Dysfunction drugs are not free from side effects. Dizziness, Headache, Flushing, Dyspepsia and Rhinitis are ailments one can associate with the consumption of Levitra.

It is important to follow the advice of your doctor or healthcare professional and take your medicines as directed. Talk to your healthcare professional about medicines that can affect your sexual function - sometimes he or she can prescribe a different medicine that may not cause these problems.