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La dose iniziale raccomandata per il acquista Viagra online è una pillola da 50 mg da assumere un'ora prima dell'attività sessuale. Se si ottiene l'effetto desiderato ma si soffre di effetti collaterali, provare a ridurre la dose a 25 mg. Se dopo aver provato quattro volte le pillole da 50 mg senza ottenere l'effetto desiderato e non si verificano effetti collaterali, aumentare la dose a 100 mg.