La erección es un fenómeno neurológico y vascular. Al cerebro llegan estímulos pro-eréctiles y estímulos inhibitorios. El cerebro procesa toda la información y trasmite las órdenes al pene a través de la médula espinal y los nervios erectores. Cualquier enfermedad o trastorno que afecte al cerebro, médula espinal, nervios erectores y pudendos puede producir impotencia.
In exchange for political impotence, they would be mostly left alone and allowed to get rich. — Paul Mozur, New York Times, "Inside China’s Dystopian Dreams: A.I., Shame and Lots of Cameras," 8 July 2018 Their suspicion is compounded by rumors that the polio vaccine causes impotence, death and, ironically, paralysis. — Meher Ahmad, New York Times, "Pakistan Has Just One New Polio Case, but Isn’t Declaring Victory Yet," 20 May 2018 Fighting back, even as an exercise in impotence, did a lot for McCain. — Alex Horton, Washington Post, "John McCain rebelled at the Naval Academy — and as a POW — long before he was a Senate maverick," 3 May 2018 Feelings of desperation and impotence are being felt throughout Central America, where the lawlessness, endemic poverty and levels of gang violence akin to war zones that have driven so many families from their homes show little signs of abating. — Washington Post, "Violence keeps Central Americans coming to US despite Trump," 21 June 2018 Uruguay's attacking impotence forced Oscar Tabarez to make two changes before the hour mark, with Nahitan Nandez and Giorgian de Arrascaeta replaced by Carlos Sanchez and Cristian Rodriguez. — SI.com, "Egypt 0-1 Uruguay: La Celeste Start With a Win as Gimenez Header Breaks Pharaohs' Hearts," 15 June 2018 It was fueled by physician ignorance and impotence, the habit of looking askance at patients whose symptoms could not be explained, and the arrival in the U.S. of German psychoanalysts who were disciples of Sigmund Freud. — Jim Carrier, STAT, "Lobotomies were once used to treat this gut disease, part of a shameful medical history," 12 June 2018 That signing's top attribute had better be goal-scoring, because the Sounders simply can't sustain with this level of attacking impotence. — Avi Creditor, SI.com, "The MLS XI, Week 14: Don't Hold Your Breath for an MLS Cup Threematch," 4 June 2018 Prostate cancer surgery in particular can have severe results, including incontinence and impotence. — Steven Petrow, Washington Post, "Watching but not treating cancer can be hard. Sometimes it’s the right approach.," 20 May 2018

La disfunción eréctil es la incapacidad persistente para conseguir y mantener una erección suficiente para llevar a cabo una relación sexual satisfactoria. La Disfunción Eréctil afecta a 1 de cada 5 hombres en España. Es necesario determinar el grado de alteración de la erección. Para ello son muy útiles los cuestionarios sobre erección, como el IIEF-5.
Guay AT, et al. American Association of Clinical Endocrinologists medical guidelines for clinical practice for the evaluation and treatment of male sexual dysfunction: A couple’s problem – 2003 update (Guías médicas de la Asociación Estadounidense de Endocrinólogos Clínicos para la práctica clínica de la evaluación y el tratamiento de la disfunción sexual masculina: un problema de pareja; actualización de 2003). Endocrine Practice (Práctica de endocrinología). 2003;9:77.

El origen hormonal no representa más del 5% de los casos de disfunción eréctil a pesar de que durante muchos años se han prescrito hormonas sexuales a los varones aquejados de problemas de erección. El mecanismo considerado responsable de la disfunción eréctil en la mayoría de las causas endocrinas es el descenso de los niveles de testosterona en sangre, que habitualmente se acompaña de una reducción del deseo sexual o libido. Un exceso de otras hormonas como la prolactina, el cortisol o las hormonas tiroideas entre otras, puede provocar también el descenso de hormonas sexuales masculinas.
Impotence is a common problem among men and is characterized by the consistent inability to sustain an erection sufficient for sexual intercourse or the inability to achieve ejaculation, or both. Erectile dysfunction can vary. It can involve a total inability to achieve an erection or ejaculation, an inconsistent ability to do so, or a tendency to sustain only very brief erections.
A veces sus hormonas se desequilibran y esto provoca la disfunción eréctil. Su médico decidirá si necesita análisis de sangre para controlar sus hormonas. Algunos medicamentos pueden causar disfunción eréctil. Si este es su caso, su médico puede sacarle ese medicamento o darle otro diferente. Beber demasiado alcohol, fumar demasiado y abusar de drogas también puede causar disfunción eréctil.
In exchange for political impotence, they would be mostly left alone and allowed to get rich. — Paul Mozur, New York Times, "Inside China’s Dystopian Dreams: A.I., Shame and Lots of Cameras," 8 July 2018 Their suspicion is compounded by rumors that the polio vaccine causes impotence, death and, ironically, paralysis. — Meher Ahmad, New York Times, "Pakistan Has Just One New Polio Case, but Isn’t Declaring Victory Yet," 20 May 2018 Fighting back, even as an exercise in impotence, did a lot for McCain. — Alex Horton, Washington Post, "John McCain rebelled at the Naval Academy — and as a POW — long before he was a Senate maverick," 3 May 2018 Feelings of desperation and impotence are being felt throughout Central America, where the lawlessness, endemic poverty and levels of gang violence akin to war zones that have driven so many families from their homes show little signs of abating. — Washington Post, "Violence keeps Central Americans coming to US despite Trump," 21 June 2018 Uruguay's attacking impotence forced Oscar Tabarez to make two changes before the hour mark, with Nahitan Nandez and Giorgian de Arrascaeta replaced by Carlos Sanchez and Cristian Rodriguez. — SI.com, "Egypt 0-1 Uruguay: La Celeste Start With a Win as Gimenez Header Breaks Pharaohs' Hearts," 15 June 2018 It was fueled by physician ignorance and impotence, the habit of looking askance at patients whose symptoms could not be explained, and the arrival in the U.S. of German psychoanalysts who were disciples of Sigmund Freud. — Jim Carrier, STAT, "Lobotomies were once used to treat this gut disease, part of a shameful medical history," 12 June 2018 That signing's top attribute had better be goal-scoring, because the Sounders simply can't sustain with this level of attacking impotence. — Avi Creditor, SI.com, "The MLS XI, Week 14: Don't Hold Your Breath for an MLS Cup Threematch," 4 June 2018 Prostate cancer surgery in particular can have severe results, including incontinence and impotence. — Steven Petrow, Washington Post, "Watching but not treating cancer can be hard. Sometimes it’s the right approach.," 20 May 2018

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 cases, 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.[17] Spinal cord injury causes sexual dysfunction including ED. 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.
El vardenafilo: Comercializado como Levitra, actúa aumentando el flujo sanguíneo en el pene siempre en presencia de estimulación sexual. Su administración debe realizarse entre 25 y 60 minutos antes de comenzar la relación sexual y su efecto dura hasta 5 horas. Los efectos secundarios de esta medicación son leves y van desde el dolor de cabeza y náuseas hasta mareos o rinitis. Hay que tener en cuenta que la concentración del fármaco en sangre se retrasa si se ingiere una comida con alto contenido en grasa. Sin embargo, este retraso no se produce con la forma bucodispersable. La forma bucodispersable de vardenafilo permite la toma sin agua y las comidas grasas no interaccionan.
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