When creating a drug that enhances blood flow to the penis, there are at least three methods to implement it:

1. Enhance the amount of nitric oxide (NO) produced in the penis

2. Enhance the amount of cyclic guanosine monophosphate (cGMP) developed in the penis in response to the NO

3. Eliminate the phosphodiesterase 5 (PDE) in the penis so the cGMP develops instead of being decomposed by the PDE

Viagra gets rid of the PDE so cGMP develop in the penis and has a greater impact on the artery walls. The greater the amount of cGMP, the greater the blood flow; the greater the blood flow the greater the strength of the erection. Viagra uses this routine because of an interesting quirk of PDE.

Unique PDE of Viagra

The human body produces at least 11 different types of PDE. Only one of those types of PDE (PDE5) is found in the penis. Once scientists noted this, the development of Viagra was relatively straightforward. Pfizer studied a chemical that would play a significant part in blocking PDE5 and nothing else. With the PDE5 blocked, cGMP could develop in the penis and enhance the blood flow there with no bearing on the other parts of the body. Were it not for this unique kind of PDE, there would be no Viagra.

Sildenafil citrate

PDE5 is an enzyme, a specially folded protein that plays a significant role in chemical reaction). PDE5 accepts cGMP and breaks it down. Pfizer needed a chemical that would not only hold PDE5 and keep it from doing its job. The chemical that Pfizer come up with is called sildenafil citrate. It fits right an outlet on the PDE5 enzyme and disables it.

Viagra consists of sildenafil citrate packaged as a pill. When a man takes a Viagra pill, the sildenafil citrate flows throughout his body, but has an impact only on the PDE5 enzyme in the penis. Viagra’s presence is felt in the bloodstream for about four hours, after which it is washed out of the blood by the liver and kidneys.
Expectations on effectiveness of viagra

In a research, more than 80% of men with ED had improved erections with the help of Viagra. More importantly, Viagra can work irrespective of your age or the severity of your ED.

Taking into account about 150 million men around the globe, who suffer from impotence, the market of drugs against erectile dysfunction is perceived as a huge field of opportunities for pharmaceutical companies, promising wonders to them. However, by now this market is officially open only to the three brand-name products – Viagra, Levitra and Cialis, the manufacturers of which hold patents on their inventions.

Constantly growing number of men with ED directly affects the overall cost of treatment, which is estimated by billions of dollars today. Of course, the economic burden could be significantly decreased with the introduction of generic medications, which are usually much cheaper than brand-name pills; but the truth is that for the time being, in the countries like the USA generic drugs against impotence are not yet approved officially.

However, due to some differences in legislation and patent law in different countries, the generic alternatives of popular ED pills have already leaked into the market of ED treatments. Being supplied mostly through online pharmacies, generic versions of Viagra, Levitra or Cialis are offered at huge price discounts, which naturally attract the attention of those people, who want to improve their sexual performance and save money at the same time.

Kamagra, Silagra, Tadalis and Caverta are only several examples of cheap alternatives promoted in the internet. Such medications, being mostly produced in India, where patents on medications are not accepted, find different ways to reach their potential customers worldwide.

Trustpharma.com aim is to offer people some educational articles on the said products, summarizing the obvious benefits of generic drugs and revealing or pointing out some potential threats, which may be hidden, unexpressed, or passed over in silence by online sellers.

Tadalis shows it miraculous property by giving the men a capability to enjoy the sex for next 36 hours after taking the dose, quite an incredible property but it is true. Tadalis contains Tadalafil that is stored in the men body and is used in very small concentration at the first sexual encounter. Tadalafil remains for 36 hours in a body and gets washed out of the body after that, thus it is possible for the men to enjoy the effect for 36 hours with the single dosage of the Tadalis.

Multiple orgasms are possible by taking the Tadalis pill. For newly married couples, sex is the most important activity and they even want to have it each and every time they get an opportunity. But, it became quite difficult to have the strong and rigid erection every time you indulge in sexual activity. Thus, for such type of problem the solution is Tadalis. Men can get the as many erections they want in the duration of 36 hours after taking the pill. Tadalis because of the capability to show long-lasting effect is termed as the “Weekend Pill.” Take it on Friday night and enjoy the sex for whole weekend.

Tadalis is very cheaper in cost than its branded counterpart. The manufacturer of the Tadalis is able to maintain a very low pricing for the drug because no investments are required for the research, clinical trials, advertising, and marketing of the product as these things are already carried out by the branded drugs manufacturer. Even the manufacturing unit of the Tadalis is located outside United States, so the value of their currency is very low in comparison to the American dollars. In spite of the low costing the manufacturer of Tadalis earns a lot of profit and thus keeps the pricing of the drug low.

Even the old men above 70 are able to rock hard erections because of the Tadalis. It has become possible for the old men to once again have a passionate sexual encounter with the help of the Tadalis. Old men were really surprised when they were able to get the erection and hold it too for long duration with the help of Tadalis. Many old men even describe the Tadalis erections as the rocket-like erection or an Eiffel tower of love. Nearly 85% of the old men who have taken Tadalis are satisfied with their sex life. Even at the age of 65 a person became the father of the child with the help of Tadalis.