This study examined the effect of structured preoperative teaching on patients' understanding of patient-controlled analgesia (PCA) and their management of pain. The experimental group received a written pamphlet and structured preoperative teaching on the use of PCA to manage their pain. The control group received the usual preoperative preparation normally provided by the physician. Both groups were later asked to complete a posttest to determine how well they understood the use of PCA and how well they managed their pain. There was no statistically significant evidence that the experimental group's knowledge of PCA was different from that of the control group. However, there was significant evidence that the experimental group managed their pain better.