I would advise you to stay away from unregulated products that claim to help to "prolong" the session or "cure" your PE problems. Instead, if the non-pharmacological options (e.g calm yourself down, communicare with partner, etc) do not work, I think you should seek help from a urologist, and discuss whether there is a need to start using dapoxetine. It's a rather safe (if used correctly as prescribed) and commonly used medication for this health problem, and hopefully you will have a better experience using it.