Final answer:
The maximum amount of current used in a galvanic treatment should generally not exceed 30 mA. Very small currents are harmless, but at 5-30 mA and above, the current can stimulate sustained muscular contractions. Currents of approximately 0.06 A can be potentially fatal.
Step-by-step explanation:
The maximum amount of current used in a galvanic treatment should generally not exceed 30 mA. Very small currents pass harmlessly through the body, with the threshold of sensation being 1 mA and shocks being apparently harmless for currents less than 5 mA. At 5-30 mA and above, the current can stimulate sustained muscular contractions. Currents of approximately 0.06 A can be potentially fatal as they can make the heart fibrillate.