This is a 24-week randomized, double-blind, placebo-controlled, parallel-group, multicenter study to evaluate the efficacy and safety of intranasal administration of 186 and 372 μg twice daily (BID) of OPN-375 in subjects with chronic rhinosinusitis (CS) with or without nasal polyps.
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Change From Baseline in Symptoms as Measured by a Composite Score for Each Symptom of Nasal Congestion, Facial Pain or Pressure Sensation, and Nasal Discharge (Anterior and/or Posterior) at the End of Week 4
Timeframe: 4 Weeks
Change From Baseline to Week 24/Early Termination (ET) in the Average Percent of the Volume Opacified in the Ethmoid and Maxillary Sinuses
Timeframe: Baseline, Week 24