Examination for a tablet
The person can hope for a miracle. The sick person is inclined to trust in miracles even more. Going on doctors, keeping to diets, carrying out medical exercises, we do not cease to dream of any water of life: has taken a mouthful of three drinks — and illnesses as did not happen 100mg viagra use paypal with a prescription in canada pfizer only. Stories about such wonderful recoveries — the main maintenance of conversations of habitues of hospitals and out-patient departments and advertising of semifraudulent institutions. And in them always it is known, what exactly has helped. Though also it is not known, why.

To real medicines and treatment methods usually happens on the contrary: to their birth on light always precede more or less clear assumptions why the given agent should help from the given illness. Then there is actually a working out — the new substance, the new instrument, a new technique of operation. Effectiveness of a novelty check "in a test tube" — on biochemical systems 100mg viagra use paypal with a prescription in canada pfizer only, on cultures of cells. Then there comes a turn of experiments on animals. But even if at these stages all 100mg viagra use paypal with a prescription in canada pfizer only expectations have proved to be true also any unpleasant surprises it was not found out, the new agent of treatment will enter into an official arsenal of medicine not earlier, than will pass the main check — in public.

Distinguish untreated
On a way of any medical novelty there is an ancient paradox. The doctor cannot treat sick of an agent which action is not known: after all it can harm, and it will be disturbance of most important of medical rules. But to learn, how the given agent operates it is possible only in one way: having applied it to treatment. No theoretical reasons, any experiments on animals guarantee that the given agent will help the sick person.

The strict decision of this paradox does not exist, in practice by the answer to it and procedure of clinical tests is. On their first phase a novelty (except for some specific classes of medicines — chemotherapeutic, ARV and etc. check on rather small group of quite healthy volunteers: the purpose of this stage is check of safety of studied influence. If it is a question of a new medicine characteristics of its exchange in an organism are specified also: the absorption, linkage with target molecules, splitting and etc. Certainly, all it was already studied on animals, but the physiology and 100mg viagra use paypal with a prescription in canada pfizer only biochemistry of each kind has the thin features, and never it is impossible to be assured in advance what exactly in this case they will not appear solving. Besides, the new preparation or a method can yield unexpected result at a combination, for example, with nicotine or alcohol. At last, there are by-effects, to notice which on animals it is simply impossible: any dog will not tell to you that the applied preparation causes in it hallucinations or blocks ability to read.

As though longly the new agent for animals was tested, the medicine recognises it only when it will be tested on the person
Depending on appointment of a studied agent criteria of safety can be very various. To a potential antitumoral medicine will forgive both a nausea, and a hair fall, and oppression of immune system — if only its basic action has appeared powerful enough. At the same time any of the listed effects will be enough to take out from "run" any agent from an impotency, a constipation or an allergic cold — 100mg viagra use paypal with a prescription in canada pfizer only even if in the dominant role the given preparation works wonders. The second phase of clinical tests is spent too on small group, but already sick. Its problem — to find out, whether the new agent helps in general at the given disease, and at least approximately to define an optimum regimen of application: duration of a course, a dosage and etc. would Seem, this problem is extremely simple: to apply to the patient investigated influence and to look — will work or not.

However unlike wonderful recoveries real medical interventions practically never lead to an absolute recovery of all patients without an exception. On what a universal and radical agent antibiotics seemed in due time, but even in days of their victorious procession doctors faced cases when their application did not give any effect — for example, at a pneumonia caused by a virus or a fungus. After excision of the inflamed appendix of the patient cannot in any way and suffer further an appendicitis — but this reason will console it in case of development of a postoperative peritonitis a little. More often than all illnesses with which the modern medicine deals 100mg viagra use paypal with a prescription in canada pfizer only, are the difficult processes caused and changed by set of factors. And the further, the progress in their treatment there is more it is expressed in some improvement of a condition observed besides only at a part of patients. For today agents and methods of treatment of AIDS do not promise the best to patients of full disposal of illness — they only allow to hope that with it the person will live almost as much, how many would live without it.

On the other hand, the condition of the patient can change and irrespective of applied treatment. With some illnesses the organism consults (or can consult basically) itself. The current of others has cyclic character: exacerbations more or are less regularly replaced by remissions. Quite often many depends on a condition of the patient, from its belief in recover, from a way of life 100mg viagra use paypal with a prescription in canada pfizer only. At last, under the same diagnosis the different conditions one of which are sensitive to applied treatment can disappear some, and others — are not present. Therefore at application of new experimental methods of treatment the picture turns out motley more often: at one improvement obvious, at others — hardly appreciable, at the third is not present any, and to someone even became worse. And the most important thing — is not clear, what role investigated influence and as it can be found out has played in all it.