The stability of concentrated monodisperse emulsions, in the presence of ionic surfactants, is theoretically studied. We show that the critical disjoining pressure, above which coalescence is experimentally found (Bibette, J.; et al. Phys. Rev. Lett. 1992, 69, 2439; Bibette, J. Langmuir 1992, 8, 3180) can be directly accounted from a simple DLVO theory and agrees with the available experimental results even without using any adjustable parameter. Consequently it becomes more plausible through these results that the rupturing step requires an energy barrier to be overtaken, this step would be the limiting step in the case of ionic layers.