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Erection begins with sexual stimulation. Sexual stimulation can be tactile (for example, by touching the penis) or mental (for example, by having sexual fantasies). Sexual stimulation or sexual arousal generates electrical impulses along the nerves going to the penis and causes the nerves to release nitric oxide, which in turn increases the production of cyclic GMP (cGMP) in the smooth muscle cells of the corpora cavernosa. The cGMP causes the smooth muscles of the corpora cavernosa to relax and allow rapid blood flow into the penis. The incoming blood fills the corpora cavernosa, making the penis expand. Erectile dysfunction (impotence) occurs when a man can no longer get or keep an erection firm enough for sexual intercourse. Having erection trouble from time to time isn't necessarily a cause for concern. But if erectile dysfunction is an ongoing problem, it may cause stress, cause relationship problems or affect your self-confidence. Name brand cialis cheapest viagra online place to buy viagra buy viagra online no prescription levitra online versand levitra online cheap Name brand cialis Penile erection is managed by two mechanisms: the reflex erection, which is achieved by directly touching the penile shaft, and the psychogenic erection, which is achieved by erotic or emotional stimuli. The former uses the peripheral nerves and the lower parts of the spinal cord, whereas the latter uses the limbic system of the brain. In both conditions, an intact neural system is required for a successful and complete erection. Stimulation of the penile shaft by the nervous system leads to the secretion of nitric oxide (NO), which causes the relaxation of smooth muscles of corpora cavernosa (the main erectile tissue of penis), and subsequently penile erection. Additionally, adequate levels of testosterone (produced by the testes) and an intact pituitary gland are required for the development of a healthy erectile system. As can be understood from the mechanisms of a normal erection, impotence may develop due to hormonal deficiency, disorders of the neural system, lack of adequate penile blood supply or psychological problems. Restriction of blood flow can arise from impaired endothelial function due to the usual causes associated with coronary artery disease, but can also be caused by prolonged exposure to bright light. Medication (tablets taken by mouth) In 1998, the first tablet to treat ED was launched. This made a huge impact on the treatment of ED. There are now four different tablets licensed in the UK to treat ED: Three of the tablets work by increasing the blood flow to your penis. They do this by affecting cGMP, the chemical involved in dilating (widening) the blood vessels when you are sexually aroused (described above). They are sildenafil (trade name Viagra®), tadalafil (trade name Cialis®), and vardenafil (trade name Levitra®). You take a dose before you plan to have sex. Because of the way they work, these medicines are called phosphodiesterase type 5 (PDE5) inhibitors. How Do Sexual Problems Affect Men? The most common sexual problems in men are ejaculation disorders, erectile dysfunction and inhibited sexual desire. What causes erectile dysfunction? There are several causes which tend to be grouped into those that are mainly physical and those that are mainly psychological. viagra online samples viagra faq cialis online canadian cialis without prescription buy generic viagra dapoxetine online buy viagra Name brand cialis Therefore, the dose and frequency of tadalafil has to be lowered in the following examples:Medications such as erythromycin, ketoconazole (Nizoral), itraconazole (Sporanox), ritonavir (Norvir), and indinavir (Crixivan) can slow the breakdown of tadalafil. Therefore men taking these medications should not take more than 10 mg of tadalafil and should not take tadalafil more frequently than every 72 hours.