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Response of feline eosinophilic plaques and lip ulcers to amoxicillin trihydrate-clavulanate potassium therapy: a randomized, double-blind placebo-controlled prospective study.

Author(s): Wildermuth BE, Griffin CE, Rosenkrantz WS.

Affiliation(s): Animal Dermatology Clinic, 5610 Kearny Mesa Road Suite B1, San Diego, CA 92111, USA. bewilderdvm@aol.com

Publication date & source: 2012, Vet Dermatol. , 23(2):110-8, e24-5

In this study, we evaluated the treatment of feline eosinophilic plaques and lip ulcers with amoxicillin trihydrate-potassium clavulanate (Clavamox(®); Pfizer Animal Health). Nineteen cats with clinical and cytological findings consistent with eosinophilic plaques and/or lip ulcers were enrolled. Lesions were photographed and their areas measured in square centimetres before and after 21 days of therapy with either flavoured amoxicillin-clavulanate suspension or flavoured placebo suspension. Sixteen cats completed the study, with nine plaque lesions (four treatment and five placebo) and eight lip ulcer lesions (four treatment and four placebo) included in the analysis. All lesions were shown to have infection, with bacterial phagocytosis present on cytological examination. Coagulase-positive staphylococci were the most commonly isolated bacteria. The amoxicillin-clavulanate-treated eosinophilic plaque group had a statistically significant 96.2% reduction in mean lesion size (-7.60 cm(2), P = 0.0078) and an 80% reduction in mean percentage of microscopic fields demonstrating evidence of bacterial infection (P < 0.0001), whereas the placebo group did not. The amoxicillin-clavulanate-treated lip ulcer group had a 42.6% decrease in mean lesion size (-0.25 cm(2), P = 0.4125) and the placebo group a 36.6% increase (+0.49 cm(2), P = 0.1575), although neither change was statistically significant. The amoxicillin-clavulanate-treated lip ulcer group had a statistically significant 65.0% reduction in mean percentage of microscopic fields demonstrating evidence of bacterial infection (P < 0.0001), while no significant reduction was observed in the placebo group. A suspension of amoxicillin trihydrate-potassium clavulanate is an effective monotherapy for the treatment of feline eosinophilic plaques.

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