Introduction Seasonal allergic rhinitis (SAR) symptoms often impair quality of life (QoL). In two randomized, double-blind phase 3 studies, twice-daily GSP301 nasal spray, a fixed-dose combination of olopatadine hydrochloride/mometasone furoate, significantly improved reflective and instantaneous Total Nasal Symptom Scores (rTNSS, primary endpoint; iTNSS, secondary endpoint) vs placebo (presented elsewhere). Results of additional endpoints comparing the efficacy and QoL of GSP301 vs placebo are reported here. Methods In study 1 (NCT02631551; N=1,180) and study 2 (NCT02870205; N=1,176), patients with SAR (≥12 years) were randomized 1:1:1:1 to GSP301 (olopatadine 665μg/mometasone 25μg BID), olopatadine (665μg BID), mometasone (25μg BID), or placebo for 14 days. Mean changes from baseline in Physician-assessed Nasal Symptom Score (PNSS) and Rhinoconjunctivitis Quality of Life Questionnaire–Standardized Activities [RQLQ(S)] for GSP301 vs placebo were analyzed using mixed-effect model repeated measures (P Results GSP301 significantly improved PNSS vs placebo in study 1 (least squares mean difference [95% CI]: -0.82 [-1.26, -0.38], PPPPP Conclusions In two phase 3 SAR studies, twice-daily GSP301 treatment provided significant improvements in nasal symptoms and QoL vs placebo and was well tolerated.
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