Abstract: An electrotherapy method; and an apparatus for delivering electrotherapy to a patient. In particular, a method and apparatus for delivering a lower energy, therapeutically effective electrical waveform to a patient through a defibrillator. The method employed to lower the energy of the waveform can be applied to both internal defibrillators and external defibrillators. Further the method can be applied to any waveform, including monophasic, biphasic or multiphasic. Various custom shapes for a defibrillation waveform can be achieved by adjusting the rate at which the energy is duty cycled throughout any or all phases of the waveform.