Objective: To compare the ocular comfort and tolerability of loteprednol etabonate 0.5%/tobramycin 0.3% (LE/T; Zylet) with dexamethasone 0.1%/tobramycin 0.3% (DM/T; TobraDex) in healthy volunteers.
Research Design And Methods: In this multicenter, randomized, double-masked, parallel-group study, healthy volunteers (n = 306) were randomized to receive LE/T or DM/T four times per day for 28 days. Subjects recorded subjective ratings for seven comfort/tolerability parameters using an electronic patient diary (EPD). The primary endpoint was the difference at week 4 from the ratings of an artificial tear at baseline in comfort/tolerability parameters between treatment groups, using a noninferiority paradigm.
Clinical Trials Registration: ClinicalTrials. gov, NCT 00532961.
Results: The 97.5% confidence intervals for the lower bound were within -10 for all of the seven comfort/ tolerability parameters evaluated (pain, stinging/burning, irritation, itchiness, foreign-body sensation, dryness, and light sensitivity). Secondary analysis revealed small but significant within-treatment differences in pain favoring LE/T over tears and in light sensitivity favoring tears over DM/T (p < 0.01). Small between-treatment differences in the changes from baseline tear ratings to individual study visits favored LE/T for pain, stinging/burning, irritation, itchiness, foreign-body sensation, and light sensitivity at visit 4 (p < or = 0.04); for pain, stinging/burning, and foreignbody sensation at visit 5 (p < or = 0.03), and for dryness and light sensitivity at visit 6 (p < or = 0.05).
Conclusions: LE/T satisfied all conditions of noninferiority to DM/T in comfort and tolerability. Subjects receiving LE/T were more likely to report better ocular comfort/tolerability ratings relative to baseline artificial tears than subjects receiving DM/T.
Limitations: The study population consisted of healthy volunteers.
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