Effects on Vision - Single oral doses of phosphodiesterase inhibitors have demonstrated transient dose-related impairment of color discrimination (blue/green), using the Farnsworth-Munsell 100-hue test, with peak effects near the time of peak plasma levels. This finding is consistent with the inhibition of PDE6, which is involved in phototransduction in the retina. In a study to assess the effects of a single dose of tadalafil 40 mg on vision (N=59), no effects were observed on visual acuity, intraocular pressure, or pupillometry. Across all clinical studies with <a href="http://drugscase.blogbugs.org/"title="CIALIS">CIALIS</a>, reports of changes in color vision were rare (<0.1% of patients).
If there were any doubts as to the increased use of Viagra, recent reports from North Wales laid those to rest. It is estimated that the use of <a href="http://viagra.myloger.com/"title="Viagra">Viagra</a> has resulted in the NHS spending more than 5 million Euros in the last 5 years. This amount was paid out by the various local health boards found in the region.
The results of the estimates have resulted in strong opposition calls from the public and the politicians. According to this group, Viagra pills should not be included on the NHS.
Their argument is based on the view that many of the users who buy Viagra pills do it for recreational purposes rather than medical reasons.
For instance, Assembly member Darren Millar whilst airing his opinion claims that the money being spent by the NHS "….is a lot of cash to be spending and we know there is demand from people wanting to use Viagra and other drugs like it for recreational purposes".
The anti-impotence drug <a href="http://www.mypage.com/buyle..."title="Viagra">Viagra</a> actually reduces men's fertility by decreasing the ability of their sperm to fertilize an egg, according to a study conducted by researchers at Queen's University Belfast and published in the journal Fertility and Sterility.
Researchers carried out two different experiments to determine what effect the popular drug might have on sperm cells. In the first study, human sperm samples were bathed in weak Viagra solutions, intended to approximate the blood concentration acquired from taking a single 100-milligram Viagra pill. They found that while the Viagra-bathed sperm became more active, they also suffered damage to the structure at their heads known as the acrosome. This portion of the cell contains enzymes that help break down the membrane around an egg so that the sperm can penetrate it.
To determine if this cell damage actually affected fertility rates, the researchers compared the fertility of two groups of male mice, one of which had been given Viagra. They found that mice in the Viagra group produced 40 percent fewer fertilized embryos than mice that had not been given any drugs.
Researcher David Glenn noted that the many fertility clinics that prescribe Viagra in order to increase sperm counts may actually be harming the fertility of their clients.
"I think it is worrying that some in-vitro fertilization clinics are using Viagra in order to boost fertility results," Glenn said. "Couples that go there for treatment are, by definition, already having problems getting pregnant. Giving male partners something that could make the problem worse is scarcely the right approach."
Glenn also expressed concern over the long-term effects that recreational Viagra use might have on people's fertility.
"Viagra has become a widely used recreational drug," Glenn said. "It is mixed with cocaine, for example, and is sold in clubs. Our work leaves open the possibility that there could be a cumulative effect from taking Viagra, however, which could pose serious fertility problems in later life."
The irony is hard to miss: men who take <a href="http://www.darelease.com/fo..."title="buy viagra online">buy viagra online</a> may be shooting blanks according to new research conducted at Queen's University in Belfast, Northern Ireland. Viagra, it seems, causes sperm cells to premature release digestive enzymes that normally break down the wall of the egg. As a result, sperm from men who take Viagra can no longer fertilize eggs as effectively.
In the United States and around the world, men who suffer from obvious nutritional deficiencies, hormonal imbalances caused by statin drugs, and an alarming lack of physical exercise are increasingly turning to Viagra to restore their youthful sexual performance. But I've got news for all Viagra fans: healthy men keep it up well into their 70's and 80's without Viagra. If you're drooping at age 40, you are suffering from some rather serious health problems, and prescription drugs are probably part of the problem. Taking statins, for example, interferes with your body's ability to create cholesterol. And cholesterol is the raw ingredient out of which sex hormones are manufactured. By taking statins, you're effectively blocking your sex hormones and practically guaranteeing you'll stay limp!
Lack of physical fitness is another big factor: men who exercise regularly (and especially those who engage in strength training) rarely have performance problems. That's because exercise generates natural hormones that keep you youthful and able.
To anyone who thinks they need Viagra, I have alternative advice: you need to change your diet, get off prescription drugs, and start strength training. Don't take one drug (Viagra) to treat the problems caused by another drug (statins). Instead, get back to the fudamentals of good health (nutrition and fitness) to restore the performance you had when you were in your 20's.
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