1. An apparatus for delivering both cardiac pacing therapy and neural stimulation therapy to a load, the apparatus comprising: an electrostimulation energy storage capacitor; a circuit path that provides pacing stimulation from the capacitor through the load; a constant current neural stimulation circuit that is switchable into the circuit path to provide neural stimulation through the load and switchable out of the circuit path to provide the pacing stimulation through the load; and a control circuit configured to selectively enable delivery of the pacing stimulation or the constant current neural stimulation.