Efficacy and function of viagra

Viagra's main function is to improve sexual ability, usually taken 30 minutes or an hour before sex. If it is taken by the elderly, the absorption will be slower, and it can be taken one hour in advance. What needs to be known is that after taking Viagra, it will only work under sexual stimulation, so it will not feel immediately after taking Viagra, and further sexual stimulation is needed to achieve better results.