There are some problems that could leave your procedure inept or prevent you from taking Viagra at all.

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When people take Sildenafil for the first time, some of them (concerning 15 %) are likely to experience particular moderate side effects, such as flushing, trouble falling asleep, nosebleeds, heartburn ( pyrosis ), frustration, diarrhea, pins and needles or tingling in the arms, legs, hands, or feet, muscle pain, and increased light sensitiveness.