is dexamethasone negative
Placement of the. electrodes is dependent on the polarity of the medication being delivered. For example, dexamethasone. has a negative polarity. Therefore, the electrode containing dexamethasone will be placed over the. affected body part and attached to the negative charge in the electrical circuit. The negative current. repels the negative dexamethasone ions, driving them through the patient's skin.2,3 Conversely, lidocaine has a positive polarity so the electrode would be attached to the positive charge in the. electrical circuit.