Instrucitons for taking mdicines are very important when using pharmaceutical drugs. Such instructions, however, have include technical terms which are too difficult for patients to understand. Assuming that the level of knowledge acquired after completing compulsory education is a measure of the social kowledge standard, we questioned patients and 3 rd year junior high school students on 20 technical terms. The numbr of correct answers was 6.7±3.0 (mean±SD) for junior high school students and 8.4±5.1 for patients. The ratio of correct answers was high in “before each meal”, “effect” and “purgative”, but low in “half-life”, “when necessary” and “heart-sealed pack” . It is therefore necessary to add interpretations of these terms, or replace these terms with other more conventionally used words. The questionnaire results suggest that medical staff are required to address the job of confirming whether patients understand the medical terms and interpret them correctly, and, at the same time, contribute to patient and junior high school studnet education.