Influences of Eye Drop Containers on the Subjective Usability of a High-viscosity Eye Drop Suspension (AZORGA<sup>®</sup> Combination Ophthalmic Suspension)

The characteristics of eye drop (ophthalmic solution) containers are reported to be associated with the appropriate use of eye drops. Since patients complain that AZORGA® Combination Ophthalmic Suspension (AZORGA® hereafter) requires more push-out force than other eye drops, there is a possibility that the container of AZORGA® is less usable than other commercially available eye drop containers in Japan. Therefore, we compared the Alconpharma container used for AZORGA® and 3 representative containers as controls, which are available in large quantities in Japan. In addition, a subjective usability questionnaire was performed in healthy adults, and the influences of containers on the subjective usability of high-viscosity eye drop suspensions, such as AZORGA®, were evaluated.