Viagra® cialis(sildenafil citrate) has dominated the global male impotence market since it was first introduced in 1998.Viagra belongs to a group of drugs that contain PDE-5 inhibitors, which work by relaxing the blood vessels and allowing blood to flow into the penis. The result is a natural erection.
Impotence (or erectile dysfunction) is defined as the inability to achieve or maintain an erection sufficient for sexual intercourse, and includes the inability to get an erection as a result of sexual stimulation or to lose your erection prior to ejaculation.
Impotence does not generally include other symptoms such as lack of libido, inability to ejaculate or the inability to achieve orgasm.
Recently, Viagra's dominant share of the impotence market has been gradually eroded by the introduction of two new PDE-5 inhibitors that work in the same way as Viagra.
The new drugs are Cialis® (tadalafil) and Levitra® (vardenafil hydrochloride trihydrate), which both claim to work faster and last longer than Viagra.
Another new oral medication Uprima® has been released in the UK and parts of Europe. Uprima works by stimulating enzymes in the brain that trigger the nerve impulses which ultimately result in an erection. Clinical trials of Uprima are proving to be very successful.
If you are interested in trying Viagra levitra, Cialis or Levitra at a deep discount just follow the link to AmeriMedRx,
a leading provider of medical consultations and prescription fulfillment.
We've included an informational guide that compares Viagra with it's competitors, so that you can decide which of the new impotence drugs and other impotence treatments would be best for you.
The popularity of Viagra viagra is largely due to the fact that it has successfully produced erections in between 65% and 75% of impotent men - even in men who had previously experienced severe and long-term impotence.
A research study undertaken by Pfizer®, the manufacturer of Viagra, demonstrated a 78% improvement in erections in a wide cross-section of the male population with impotence problems.
Viagra starts to take effect within 30 minutes and can last up to four hours. However in most cases, the erection ceases after ejaculation.
A heavy meal and alcohol consumption may increase the period of time it takes to start working effectively.
Another important factor in the success of Viagra is that the distinctive little blue pill is taken orally, and requires no invasive medical procedures.
Viagra is only available with a doctor's prescription.
Lipitor
Nexium
Aciphex
Prevacid
Singulair
EffexorXR
Actos
Lexapro
Topamax
zovirax
Valtrex
Ventorlin
levitral
Cialis Professional