Abstract: Improved electrotherapeutic apparatus comprisesA. an electromagnetic energy radiating head including primary and secondary coils and a capacitor electrically connected across the secondary coil,B. and an input circuit including a source of high frequency oscillations, a power amplifier and a control circuit for creating and transmitting to the head a sequence of pulses of high frequency electrical energy and for controlling the amplitude of the pulses and the intervals therebetween, the pulses having substantially rectangular shape and having a repetition rate and duration characterized in that they define a duty factor of between 0.35 and 0.55, where(duty factor) = (pulse repetition rate in pulses per second) .times. (pulse duration in micro seconds).