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It usually takes about 30 minutes for Viagra to reach a sufficient concentration in the blood to begin working. The effect lasts for about four hours. In one clinical trial involving more than two-hundred participants with prior experience in using Viagra successfully, the highest allowable dose of 100mg enabled 35% to produce an erection hard enough to achieve penetration in under 15 minutes. All but 15% were able to penetrate within 20 minutes.
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