Comparison of Brand-name and Generic Products of Latanoprost Ophthalmic Solution with Respect to the Sense of Use

Many generic products of latanoprost ophthalmic solution are commercially available. For pharmacists' guidance, patients often ask questions, such as the total number of drops to be used per bottle. However, materials, including package inserts, that can be obtained from pharmaceutical companies do not provide such information, such as the total number of drops, the volume of a drop, or sense of use regarding each preparation. In this study, we compared the total number of drops, the weight of a drop, squeezing force, and sense of use using brand-name and generic products of latanoprost ophthalmic solution to establish selection criteria.