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Inuria. cheap kamagra viagra Also called symptomatic porphyria. Porphyria cutanea tarda an inherited disease that results in the overproduction of porphyrins. viagra pills Mentioned in: hyperpigmentation porphyria cutanea tarda (pct), the most common form of porphyria, characterized by cutaneous photosensitivity that causes scarring bullae, hyperpigmentation, facial hypertrichosis, and sometimes sclerodermatous thickenings and alopecia. It is frequently associated with alcohol abuse, liver disease, or hepatic siderosis. viagra no prescription Urinary levels of uroporphyrin and coproporphyrin are increased, and activity of a specific enzyme involved in heme biosynthesis is decreased. The cause is debated, but two types are generally recognized: an autosomal-dominant (or familial) form in which activity of the affected enzyme is reduced to half normal in liver, erythrocytes, and fibroblasts, and a sporadic (but probably also familial) form in which the reduction is confined to the liver. what happens when women take male viagra Both types are believed to be heterozygous, with clinical expression occurring in adulthood, precipitated by disease or environmental factors. generic viagra online A more severe homozygous form begins in childhood and is called hepatoerythropoietic porphyria. viagra sales in india See also porphyria. viagra canada achat Porphyria [por-fēr´e-ah] a genetic disorder characterized by a disturbance in porphyrin metabolism with resultant increase in the formation and excretion of porphyrins ( uroporphyrin and coproporphyrin ) or their precursors; called also hematoporphyria. Porphyrins, in combination with iron, form hemes , which in turn combine with specific proteins to form hemoproteins. Hemoglobin is a hemoprotein, as are many other substances essential to normal functioning of the cells and tissues of the body. Two general types are known: the erythropoietic porphyrias, which are concerned with the formation of erythrocytes in the bone marrow; and the hepatic porphyrias, which are responsible for liver dysfunction. Manifestations of porphyria include gastrointestinal, neurologic, and psychologic symptoms, cutaneous photosensitivity, pigmentation of the face (and later of the bones), and anemia with enlargement of the spleen. viagra canada achat Large amounts of porphyrins are excreted in the urine and feces. cheap viagra tablets uk Treatment of this condition has been primarily symptomatic and varies in its effectiveness. Emphasis is on prevention of attacks by avoiding fasting and drugs that precipitate the symptoms. generic viagra without prescription Photosensitivity may be controlled by avoiding exposure to light. Removal of the spleen is useful in some cases of the erythropoietic type of porphyria. buy viagra from canada Drug therapy includes the use of phenothiazines, chlorpromazine and promazine in p. viagra or viagra which is better ultimo aggiornamento: settembre 2009