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At Roman you can buy genuine Viagra by completing an online visit with one of our licensed physicians. metoprolol 12.5 mg Sildenafil (známější pod komerčním názvem Viagra) je prostředek používaný muži na erektilní dysfunkci (impotenci), vyvinutý farmaceutickou společností Pfizer. Jeho účinek spočívá v tom, že inhibuje fosfodiesterázu, jež by jinak rozkládala cyklický GMP. Cyklický GMP následně může stimulovat účinek oxidu dusnatého (NO), látky, která je schopná vyvolat erekci. Sildenafil byl připraven pod kódovým označením UK-92480 skupinou chemiků ve výzkumném ústavu firmy Pfizer v anglickém Sandwichi. Nejprve byl studován jako možný lék na vysoký tlak a anginu pectoris a prošel klinickými testy. Firma Pfizer se tedy následně rozhodla lék nabízet k léčbě erektilní dysfunkce. Lék si patentovala v roce 1996 a v roce 1998 získala povolení amerického úřadu FDA. 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Links to all outside sites are provided as a resource to our visitors and do not imply an endorsement or recommendation of a particular physician by Pfizer, nor an endorsement of any Pfizer product by a telehealth provider or any physician. Pfizer accepts no responsibility or liability for the content or services of other websites. The primary indication of sildenafil is treatment of erectile dysfunction (inability to sustain a satisfactory erection to complete intercourse). Its use is now one of the standard treatments for erectile dysfunction, including for men with diabetes mellitus. Rare but serious adverse effects found through postmarketing surveillance include prolonged erections, severe low blood pressure, myocardial infarction (heart attack), ventricular arrhythmias, stroke, increased intraocular pressure, and sudden hearing loss. Care should be exercised by people who are also taking protease inhibitors for the treatment of HIV infection. 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