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When a chain is sexually aroused, blood flows into the penis longer than usual. From this the penis increases and becomes firmer. This accustom is called erectile dysfunction. After sexual coitus, this nimiety blood flow to the penis stops. An erection is lost.If an erection lasts with a view a extensive at the same time (more than 6 hours), this condition can permanently devastation your penis. You should consult a doctor this instant if you have an erection persists object of a long period of heyday (more than 4 hours).Some diseases and some medicines reception interfere with the easy erection. In these cases, scant blood glide to the penis. Accordingly, geezer cannot bring off a total erection. If this make ready occurs frequently and repeatedly, it’s called erectile dysfunction. Viagra enables many men with erectile dysfunction to place a genuine answer to libidinous stimulation. When a man is sexually excited, Viagra helps to upgrade blood glide to the penis, allowing it to be filled with blood sufficiently as a service to an erection. After the finalization of sexual contact erection disappears. Sildenafil is a brand-new oral drug in search the treatment of erectile dysfunction. It restores impaired erectile function and provides a natural response to bodily stimulation. To reveal a favorable pharmacological effect of cialis requires sexual stimulation. Physiologic mechanicalism of erection of the penis involves deliver of nitric oxide (N0) in the cavernous firmness during sexual stimulation. Nitric oxide activates which leads to increased levels of cyclic guano sine, which in turn causes mitigation of glassy muscle of the corpus cavernous and increased blood glide to the penis. Safe employ of sildenafil in the following subgroups of patients has not been conscious, and, therefore, its use is contraindicated in them to again knowledge: a unfavourable hepatic breakdown, hypotension (blood pressure 90/50 mm). generic levitra is not intended for use in women. Reproduction studies in rats and rabbits, oral administration of sildenafil did not utilize teratogenic effects, had no effect on reproductive banquet and did not origin violations of peri / postnatal development of the fetus and newborn. A separate quantity of Viagra orally at a quantity of 100 mg in flourishing volunteers is not accompanied by changes in motility or sperm morphology. In studies in salutary volunteers at single dosage of the narcotic in doses of 800 mg of adverse events were comparable to those when fascinating Viagra at cut doses, but were more common. In case of overdose should be symptomatic appropriate standard measures. Dialysis should not accelerate allowance of sildenafil, as the latter avidly binds to plasma proteins and is excreted in the urine. Preparations repayment for the treatment of erectile dysfunction should be hand-me-down with advice in patients with anatomical deformation of the penis (such as angulations, cavernous fibrosis or Peyronie’s plague) in people suffering from diseases that predispose (such as sickle cell anemia, multiple myeloma, or leukemia).