We study the transport of ions across model membranes in response to pulsed applied current within the framework of the time-dependent Nernst-Planck electrodiffusion equations. We present numerical results for the time-dependence of ion concentrations in the membrane and for the time-averaged ion fluxes through the membrane for several pulsed-current waveforms and frequencies, and we compare these results to those for constant-current iontophoresis with equivalent current levels. For pulsed-current frequencies that are high compared with characteristic rates of passive ion diffusion across the membrane, the ion concentrations execute small oscillations about the equivalent constant-current steady-state concentration profiles. In this limit, pulsed-current average fluxes are essentially identical to the values obtained with the corresponding constant-current iontophoresis protocol. For very low pulsed-current frequencies, however, a small flux enhancement of a low mobility ion species in the presence of other highly mobile ions is possible. We discuss the possible relevance of our results to pulsed transdermal iontophoresis experiments.