Effect of warning placement on the information processing of college students reading an OTC drug facts panel.

Objective: To compare three over-the-counter (OTC) Drug Facts panel versions for information processing optimization among college students.

Participants: University of Houston students (N = 210) participated in a cross-sectional survey from January to May 2010.

Methods: A current FDA label was compared to two experimental labels developed using the theory of CHREST to test information processing by re-positioning the warning information within the Drug Facts panel. Congruency was defined as placing like information together. Information processing was evaluated using the OTC medication Label Evaluation Process Model (LEPM): label comprehension, ease-of-use, attitude toward the product, product evaluation, and purchase intention.

Results: Experimental label with chunked congruent information (uses-directions-other information-warnings) was rated significantly higher than the current FDA label and had the best average scores among the LEPM information processing variables.

Conclusion: If replications uphold these findings, the FDA label design might be revised to improve information processing.