Visit 1 (Day 0): Screening visit. Assessment of outcome measures~Visit 2 (Day 7): Enrollment visit after a 1-week wash-out period. Enrolled to the Study are only patients who show a severe enough and stable disease (SNOT score >20 and change of SNOT score <15% compared to Visit 1, respectively).~Visit 3 (Day 21): Assessment of outcome measures after 2-week treatment phase~Visit 4 (Day 49): Follow-up visit
Proof-of-concept study with a novel nasal spray in chronic rhinitis or chronic sinusitis. The study will involve 25 patients completing the study for a per protocol analysis.