Which type of ophthalmic medication typically has a longer shelf life?

Ointments and gels generally have a longer shelf life compared to other types of ophthalmic medications. This can be attributed to their formulation and the presence of specific ingredients that contribute to stability. The thicker consistency of ointments and gels creates a barrier that reduces the exposure of the medication to air and moisture, which can degrade the active ingredients over time.

Additionally, ointments and gels often contain preservatives that help extend their shelf life by preventing microbial contamination. In contrast, solutions and suspensions, which are typically more fluid, are more susceptible to changes in pH and can be more prone to microbial growth unless they are properly preserved. Inserts, while also stable, tend to be used within a specific timeframe after opening to maintain their efficacy. Therefore, ointments and gels are usually the most stable and longest-lasting options among the various forms of ophthalmic medications.