Dreams are blue. For several years, Blue is the color, the color of the magic pill, the glint in his eyes and a happy smile on the face pairs. Blue is for Viagra. The little blue miracle pills are the means for men with erectile dysfunction, impotence, and helping with those at the usual performance in sex. The company Pfizer has released about 20 years ago and revolutionized the market Viagra. Meanwhile, there are also generic Viagra (150mg, 100mg, 50mg, 25mg). When Viagra is a cheaper means having an equally good, highly effective effect as the original agent. Both agents, Viagra and generic Viagra contain the active ingredient sildenafil. If you are taking a pill, you can start with the sexual act after a few minutes. The full effect is, however, develops only after about 30 to 45 minutes. The duration of action of a pill is 5 to 6 hours. In this time you can have sex as often as you want. After the effect wears off gradually. In any case, you have to have no fear that you constantly have a stand at this time effect. An erection is only concluded when one is sexually stimulated..