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With Viagra get an erection most powerful. Cheap generic viagra (sildenafil) has the safety and effective of global recognition and acts about 45 minutes after the first intake.
Oral treatment
The cyclic nucleotide phosphodiesterases constitute a group of enzymes that catalyse the hydrolysis of the cyclic nucleotides cyclic AMP and cyclic GMP. They exist in different molecular forms and are unevenly distributed throughout the body.
One of the forms of phophodiesterase is termed PDE5. The prescription PDE5 inhibitors sildenafil (Viagra), vardenafil (Levitra) and tadalafil (Cialis) are prescription drugs which are taken orally. They work by blocking the action of PDE5, which causes cGMP to degrade. CGMP specific phosphodiesterase type 5 causes the smooth muscle of the arteries in the penis to relax, allowing the corpus cavernosum to fill with blood.
These medications work when there is sexual stimulation. Depending on the treatment, it will need to be taken 20 minutes to 1 hour before sex and the period of time over which it works can vary between 3 hours and up to 36 hours.
Other articles from the section: Erectile Dysfunction
Overview and symptoms
Erectile dysfunction is characterized by the regular or repeated inability to obtain or maintain an erection. There are several ways that erectile dysfunction is analyzed: Obtaining full erections at some times, such as when asleep (when the mind and psychological issues, if any, are less present), tends to suggest the physical structures are functionally working. However, the opposite case, a lack of nocturnal erections, does not imply the opposite, since a significant proportion of sexually ...Section: Erectile Dysfunction
Causes
Drugs (Anti-depressants (SSRIs) and Nicotine are most common. A study entitled "Drug-induced mal sexual dysfunction" concluded that of the 12 most commonly prescribed medications on the market today, 8 of those medications list "impotence" as a side-effect of the drug. Other drugs such as alcohol, cocaine, and heroin negatively impact male sexual libido.) Neurogenic Disorders (spinal cord and brain injuries, ...Section: Erectile Dysfunction
History
The earliest attempts at treating erectile dysfunction date back to Muslim physicians and pharmacists in the medieval Islamic world. They were the first to prescribe medication for the treatment of this problem, and they developed several methods of therapy for this issue, including a single-drug therapy method where a drug was prescribed and a "combination method of either a drug or food." Most ...Section: Erectile Dysfunction