Tadapox will not keep you erect continuously, but it can help you maintain an erection during sexual activity if you’re sexually aroused. Dapoxetine helps prevent premature ejaculation, allowing you to last longer in bed, but it won’t directly prevent you from losing your erection. However, by delaying ejaculation, it may improve your sexual experience and satisfaction. The erection will only be sustained while you are sexually aroused and can subside after sexual activity or lack of stimulation.