['Vasomotor rhinitis (VMR) is a hypersensitivity syndrome with heightened reactivity to environmental triggers.', 'Twenty-two patients with severe VMR were treated nasally with either normal saline or 0.6% olopatadine and challenged nasally with a hyperosmolar mannitol solution.', 'Treatment with 0.6% olopatadine resulted in an improvement in instantaneous nasal symptom scores at 5 and 30 minutes (p < 0.01) compared with baseline and at 30 minutes after hyperosmolar challenge compared with saline-pretreated individuals (p < 0.01). There was also an improvement in nasal peak inspiratory flow rate at 30 minutes after hyperosmolar challenge compared with saline-pretreated individuals (p < 0.01).'] Does olopatadine 0.6 % nasal spray protect from vasomotor challenge in patients with severe vasomotor rhinitis?