best cheap viagra pills
But in some cases — so far as concerns sedatives, antidepressants, agents from a nausea and etc. — platsebo-control is necessary and on the third phase. So, in one research two preparations stopping a chronic itch, which intensity patients were compared should express in conditional points. Without treatment average intensity of an itch made 50 points. The cyproheptadine preparation reduced it to 28, Trimeprazinum — to 35, and placebo — to 30. The statistical analysis has not taped authentic differences neither between investigated preparations, nor between any of them and placebo — though results of action of all of three authentically differed from absence of treatment.

Inevitable corrective amendments
The double blind method is desirable, but is not always applicable. If two techniques of operation the surgeon at all desire should know, say, are compared, whether it operated so. And it is necessary if to compare surgical and conservative treatment then and from the patient you will not hide, it has got to what group. However, and in the most classical case when action of two preparations indistinguishable in appearance is compared to observe "blindness" it is possible not always. In 1985 clinical tests best cheap viagra pills there passed a beta-blocker propranolol — its efficiency as protection against a repeated infarct was found out. All methodical demands have been observed: each patient received a preparation with the individual code, and neither patients, nor the personnel of clinic did not know, what codes correspond to a medicine, and what — a baby's dummy. But when research has been finished, and codes are not opened yet, authors have suggested participants to guess, who that received. The right answer of a distance of 80 % of the patients receiving propranolol, and 57 % of addressees placebo. Answers of doctors and sisters too much more surpassed level of casual guessings. Authors of witty research have refrained from generalisations, giving to colleagues to solve, is how much frequent notorious "double blindness" it appears fiction.

Ideal tests are in what neither the patient, nor the doctor do not know, in what capsule there was an investigated agent, and in what — a preparation-baby's dummy (placebo).

That patients know or guess the accessory to skilled or control group, of course, accident reduces cleanliness of the received results, but in itself yet. However the live person with its desires and emotions is rather inconvenient as object of strict experiment. Whatever obligations he signed before the beginning of tests, hardly it will resist temptation to raise the chances of treatment — especially if illness threatens his life. Imagine, say, that you are sick of AIDS and have got to the program of clinical tests of various agents against it. What of them will appear more effective, anybody does not know, but all together they should help! And as in many countries of a HIV-infected patients have framed for a long time rather active communities, participants of tests start to exchange medicines with each other and along with investigated preparations to use got on the party. It is clear that they it do not inform the doctors on all. It is difficult to condemn those who swindles in a flirtation with death, but as a result results of such tests turn to the senseless porridge which is not giving any authentic knowledge: formally leaves that all preparations and schemes of treatment a little than differ from each other and from baby's dummies-platsebo.

Most strongly such effects best cheap viagra pills are shown, when tests pass in an out-patient regimen. In a hospital, of course, all is easier: performance of the prescribed treatment provides the personnel, control over behaviour of the patient is much more rigid, and for regimen disturbance — it is less than possibilities, than at liberty. But in any clinical tests the patient can simply refuse the further participation — at any moment and without assigning any reasons. Its this right.

Expensive pleasure
The first similar research has been spent in 1948 are there were clinical tests of an antibiotic of streptomycin as an agent against a tuberculosis. Still for a long time after that they remained faster a method of scientific research, than the applied medicine standard: such researches are difficult, roads, demand very big carefulness. Besides, they badly got on with the traditional clinical thinking focused on specific features of the concrete patient both a concrete picture of illness and mistrustfully concerning statistical methods and patterns. However today the medicine or a method of the treatment, which test do not correspond to criteria "randomize controllable research", simply have no chances to enter into an arsenal of the European and American doctors. Meanwhile the USA and the European Union make about three quarters best cheap viagra pills of the world mediko-pharmaceutical market, and the basic world manufacturers of medicines are focused first of all on their rules.

Employee FDA doctor Frensis Kelsi has been compelled to forbid thalidomide sale best cheap viagra pills when at the women accepting during pregnancy this harmless tranquilizer, children with terrible teratisms began to be born. Trying to prevent similar unexpected effects, pharmacists and the medical authorities do tests more and more difficult and long.