Abstract: An electrotransport device (10) for the electrotransport delivery of agents having at least one hydrophobic site thereon, such as peptides and proteins, contains donor and counter electrodes (12, 16 and 14, 18), a power source and electrical control circuitry (24). The donor electrode (12, 16) contains, in addition to the agent, an electrotransport enhancer such as non-ionic surfactants or zwitterionic surfactants without a net charge. A method of increasing electrotransport flux of agent shaving at least one hydrophobic site thereon utilizes non-ionic or zwitterionic surfactants in the solution or suspension containing the agent. A method for the electrotransport delivery of an agent with at least one hydrophobic site through a body surface relies on the incorporation of a non-ionic surfactant or a zwitterionic surfactant without a net charge, into the solution or suspension containing the agent to decrease its hydrophobicity.