Abstract: Devices and methods are provided for administering a drug to a biological tissue in a patient, such as by intracellular and/or dermal delivery. The device includes a piezoelectric pulse generator; and an array of microneedle electrodes electrically coupled to the piezoelectric pulse generator, wherein the device, following insertion of the microneedle electrodes into the biological tissue, is configured to generate and deliver one or more electrical pulses through the microneedle electrodes effective to electroporate cells in the biological tissue and enable delivery of a drug into the electroporated cells.