Viagra

Co to jest Viagra?

Preparat Viagra to niebieskie tabletki o kształcie zaokrąglonego wielokąta, które zawierają substancję czynną syldenafil (25, 50 lub 100 mg). Preparat Viagra jest stosowany w leczeniu zaburzeń erekcji (zwanych czasami impotencją) u dorosłych mężczyzn, polegających na niezdolności do uzyskania lub utrzymania wzwodu prącia (erekcji) w stopniu wystarczającym dla osiągnięcia satysfakcjonującego stosunku płciowego. Warunkiem skuteczności preparatu Viagra jest stymulacja seksualna. Lek jest dostępny wyłącznie na receptę.

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Jak działa Viagra?

Lek działa poprzez wspomaganie rozkurczu naczyń krwionośnych w prąciu, zwiększając napływ krwi do prącia podczas podniecenia seksualnego. Preparat Viagra pomaga osiągnąć wzwód jedynie pod warunkiem uprzedniego podniecenia seksualnego. Viagra nie jest przeznaczona dla kobiet.

Jak stosować preparat Viagra?

Zalecana dawka preparatu Viagra to 50 mg przyjmowane w zależności od potrzeb około godzinę przed aktywnością seksualną. Jeśli preparat Viagra jest przyjmowany podczas posiłku, początek działania leku może być opóźniony w porównaniu do przyjęcia leku niezależnie od posiłku. W zależności od skuteczności i działań niepożądanych dawkę leku można zwiększyć maksymalnie do 100 mg lub zmniejszyć do 25 mg. Pacjenci z zaburzeniem czynności wątroby lub ciężkim zaburzeniem czynności nerek powinni rozpocząć leczenie od dawki 25 mg. Maksymalna zalecana częstotliwość stosowania to jeden raz na dobę.

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Jak długo działa Viagra?

Preparat Viagra zaczyna działać po 30 – 60 minutach po zażyciu. Tabletkę należy połknąć w całości popijając nie wielka ilością wody. Preparat Viagra umożliwia osiągnąć erekcje jedynie pod warunkiem pobudzenia seksualnego. Zastosowanie preparatu Viagra bez stymulacji seksualnej nie spowoduje erekcji. Czas, po którym występuje działanie Viagry jest inny u każdego pacjenta. Zwykle wynosi od pół godziny do jednej godziny. Tabletka może zadziałać później, jeśli została przyjęta po obfitym posiłku. Zdolność do uzyskanie erekcji, może być czasowo zaburzona po spożyciu alkoholu. Aby w sposób maksymalny wykorzystać możliwości terapeutyczne preparatu Viagra, nie należy spożywać znacznych ilości alkoholu przed zażyciem preparatu.

 

Jak badano preparat Viagra?

Preparat Viagra badano w czterech głównych badaniach z udziałem 1690 pacjentów w wieku 19-87 lat, u których jego działanie porównywano z placebo (leczenie obojętne) w okresie od 12 do 26 tygodni. W dwóch z powyższych badań zastosowano stałe dawki (pacjenci przyjmowali 25, 50 lub 100 mg), w dwóch pozostałych dawki były zmienne (początkowo pacjenci przyjmowali 25 mg i w ©EMEA 2006 2/2 zależności od odpowiedzi na leczenie mogli przejść na 50 mg lub 100 mg). Ponadto przeprowadzono badania u pacjentów po urazie rdzenia kręgowego i u pacjentów z cukrzycą. Wyznacznikiem skuteczności była zdolność do uzyskania i utrzymania erekcji. Informacje zapisywano w specjalnym kwestionariuszu wypełnianym w domu, stosując system oceny o skali pięciopunktowej (w którym 5 oznacza najlepszy wynik).

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Korzyści ze stosowania preparatu Viagra?

We wszystkich badaniach preparat Viagra okazał się znacznie bardziej skuteczny niż placebo. Wyniki kwestionariusza dotyczące pytania, jak często pacjent był w stanie odbyć stosunek seksualny, wahały się od 2 w przypadku braku leczenia do 3 lub 4 w przypadku przyjmowania preparatu Viagra 50 mg. W badaniach z zastosowaniem stałej dawki odsetek pacjentów zgłaszających poprawę erekcji wynosił 62% (25 mg), 74% (50 mg) oraz 82% (100 mg) w porównaniu z 25% pacjentów, którzy przyjmowali placebo.

Jakie ryzyko wiąże się ze stosowaniem preparatu Viagra?

Najczęstsze działania niepożądane (u więcej niż 1 pacjenta na 10) to ból głowy i zaczerwienienie twarzy. Pełny wykaz wszystkich zgłaszanych działań niepożądanych związanych ze stosowaniem preparatu Viagra przedstawiono w ulotce dla pacjenta. Preparatu Viagra nie powinny stosować osoby nadwrażliwe (uczulone) na syldenafil lub którykolwiek składnik preparatu, i u których nie jest wskazana aktywność seksualna (np. mężczyźni z ciężkimi chorobami układu krążenia, jak niestabilna dławica piersiowa lub ciężka niewydolność serca). Preparatu Viagra nie powinni także przyjmować pacjenci, którzy doznali utraty widzenia spowodowanej zaburzeniami przepływu krwi do nerwu w gałce ocznej (NAION, czyli niedokrwienna przednia neuropatia nerwu wzrokowego). Przeciwwskazane jest przyjmowanie preparatu Viagra z azotanami (leki stosowane w leczeniu dławicy piersiowej). Ponieważ preparatu Viagra nie badano na pacjentach z ciężką niewydolnością wątroby, niedociśnieniem (niskim ciśnieniem krwi), po niedawno przebytym udarze lub zawale mięśnia sercowego (ataku serca), dlatego też nie powinni oni go stosować. Preparatu Viagra nie można stosować u pacjentów z dziedzicznymi chorobami oka, takimi jak retinitis pigmentosa

1 307 myśli na “Viagra

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