Due to a higher morbidity rate and a greater need for medications, the elderly are at a high risk for problems with medications. Literature on intervention strategies related to the medication problems of the elderly proved that education for the elderly does make a significant effect. The elderly who received this education had a greater knowledge of medication and made fewer medication errors. Medication education for the elderly in the community is an urgent need. The purpose of this study was to evaluate the effectiveness of a nursing intervention via group teaching strategy for the elderly in the community. The pre-experimental design was chosen for this study. The subjects included 127 volunteers over 65 years of age in Northern Taiwan. Data from pre-and post teaching were collected and analyzed via SPSS computer software. The research findings revealed that the participants' education level were higher than general elderly. The mean score of medication knowledge in pre-test was 12.88 ± 2.25 (85 ± 15% of the total scores). It was improved to 13.54 ± 1.54 in post-test. The mean score of medication behavior in pre-test was 51.07 ± 6.20 (80 ± 9% of the total scores). After group teaching, it was improved to 54.02 ± 5.68 and paired t-test had significant differences. Group teaching can improve the elderly's medication knowledge and medication behavior. The effectiveness of group medication education in the five areas was different. Group medication education was effective for both rural and urban elderly people, elderly people in the rural area had significant differences in comply with taking medicine. It is recommended that group teaching could be provided for the elderly with similar disease in a more systematic way.