In dogs with atopic dermatitis, are antihistamines as effective as glucocorticoids at reducing the severity of clinical signs?
Clinical bottom line
Category of research question
The number and type of study designs reviewed
Two randomised control trials and one crossover placebo-controlled trial
Strength of evidence
Critical appraisal of the selected papers meeting the inclusion criteria collectively provide weak evidence in terms of their experimental design and implementation
The outcomes reported were conflicting. Two studies reported that fexofenadine may be as effective as methylprednisolone at reducing the severity of clinical signs after 6 weeks of treatment however, the study size was small in one and there was limited reporting of the data in the other. The third study, the crossover placebo-controlled trial, tested a variety of antihistamines and prednisone with limited reporting of statistical analysis of the data and found that antihistamines did not provide a sufficient reduction in pruritus unless combined with prednisone
In view of the strength of evidence and the outcomes from the studies, there is insufficient quality of evidence to answer the PICO question and further comparative study is needed
The application of evidence into practice should take into account multiple factors, not limited to: individual clinical expertise, patient’s circumstances and owners’ values, country, location or clinic where you work, the individual case in front of you, the availability of therapies and resources.
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