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If you have diabetes or heart conditions like atherosclerosis (fat buildup in blood vessels), do expect Viagra to be less effective and last for a shorter duration. If possible, limit alcohol consumption or smoking before taking Viagra as they decrease blood flow to the penis, thereby reducing the Viagra’s overall effectiveness. Certain medications (such as those including nitrates or alpha-blockers) can interact with Viagra, affecting how long the Viagra lasts in your system. In such cases, you might require different dosages of Viagra for better results. However, the duration of Viagra’s effects depend on various external factors such as your body’s metabolism rate. For most men, Viagra lasts between 2 to 3 hours before its effects start decreasing.

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