Loteprednol and tobramycin in combination: a review of their impact on current treatment regimens.

Timothy L Comstock, Edward J Holland

Index: Expert Opin. Pharmacother. 11(5) , 843-52, (2010)

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Abstract

The treatment of ocular inflammation continues to be a challenge. Topical corticosteroids are effective in reducing ocular inflammation but are limited by adverse events including elevation of intraocular pressure, development of cataracts, glaucoma and inhibition of wound healing with associated risk of infection. Loteprednol etabonate (LE) is a unique C-20 ester corticosteroid designed to produce a predictable therapeutic effect with a low incidence of side effects. Zylet (LE/T) a combination of LE and tobramycin (T) is indicated for the treatment of steroid-responsive ocular inflammatory conditions in which there exists either superficial bacterial ocular infection or a potential risk of bacterial infection.The current review of the literature (Medline and the Cochrane Library, 1996 - 2009) examines the safety and efficacy of LE/T in the treatment of ocular inflammation.Studies with either LE or LE/T indicate that LE has a lower risk of IOP elevation compared with C-20 ketone corticosteroids owing to its rapid de-esterification to inactive metabolites. LE also lacks the ability to form Schiff base intermediates with lens proteins, a common first step in cataractogenesis. LE/T was noninferior to dexamethasone 0.1%/tobramycin 0.3% in the treatment of blepharokeratoconjunctivitis.LE/T may be a safer treatment option for ocular inflammation in which there is risk of superficial bacterial infections.