Sildenafil has a rapid onset of effect and the average response time is 27 minutes with the optimal effect happening at 57 minutes. The effects usually last 4 to 6 hours, however, this can vary slightly from one person to another. Practical knowledge of the durational efficacy of this medication is useful for couples planning sexual activity. For this reason, research took place to investigate the duration of effect of sildenafil tablets in men with erectile dysfunction (ED).
A study that involved 16 men with ED between the ages of 36 and 68 took place in the UK. The men received 100mg sildenafil or inactive placebo tablets 1, 8 or 12 hours before visual sexual stimulation. A portable device that is used to assess the quality of erections was used in the study. The average duration of erections with 60% or more rigidity was measured and the results were as follows:
How long does sildenafil last is a question with an answer that can vary. However, this study revealed that the maximum effect is felt at one hour after administration. The research also suggested that the duration of effect was longer than what was previously thought. A substantial proportion of the men still found the medication effective up to 12 hours after taking a tablet.
This medication encourages optimal blood flow to the penile region and this makes it easier for a man with ED to achieve an erection. It does not cause an erection directly. There needs to be some form of visual or physical stimulation for the medication to take effect.
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