Vardenafil (Vardenafil) is the world's latest drug treatment the disease erectile dysfunction (ED) , it is research and develope by the German Bayer (Bayer) and GlaxoSmithKline (Glaxo Smith Kline) company.It is has the following advantages: use less, only 20mg (sildenafil need 120 mg-150mg) . Faster onset time, 15 to 30 minutes effective.   Less Side effects, but individual differences, there is still less than 2% would somewhat mild headache. Soluble in water and ethanol capability, it is ideal raw material done impotence alcohol, soft capsules and oral solution.