The purpose of this guidance is to assist sponsors in the development of drug products for the treatment of allergic rhinitis in children and adults. The guidance addresses issues of trial design, effectiveness, and safety for new products being developed for the treatment of seasonal allergic rhinitis (SAR) and perennial allergic rhinitis (PAR).

The recommendations in this guidance are based on an assessment of important issues raised in the review of both adult and pediatric allergic rhinitis clinical trials and the Agency’s current understanding of the mechanism of the two related disorders of SAR and PAR. The pathophysiology of SAR and PAR are similar in terms of the chemical mediators produced and end-organ manifestations, with differences between the two entities primarily based on the causes and duration of disease. The trial design issues pertaining to SAR and PAR trials are also similar. Thus, these two categories are treated collectively in this guidance as allergic rhinitis, with differences in recommendations for the design of SAR and PAR trials indicated. Sponsors are encouraged to discuss details of trial design and specific issues relating to individual products with division review staff before conducting clinical trials.

This guidance does not contain discussion of the general issues of statistical analysis or clinical trial design. Those topics are addressed in the ICH guidances for industry E9 Statistical Principles for Clinical Trials and E10 Choice of Control Group and Related Issues in Clinical Trials, respectively, as well as the draft ICH guidance for industry E9(R1) Statistical Principles for Clinical Trials: Addendum: Estimands and Sensitivity Analysis in Clinical Trials.

Posted on the FDA website on 5 September 2018