Utilization Pattern and Related Knowledge of Nasal Decongestants Among the General Population in Al-Qunfudah Governorate, Saudi Arabia: A Community-Based Cross-Sectional Study.

Background: Nasal decongestants, like phenylephrine and pseudoephedrine, are commonly used to relieve nasal obstruction in conditions such as allergic rhinitis. They induce nasal passage dilation through vasoconstriction but can lead to serious side effects like hypertension and rebound congestion. Despite being easily accessible over the counter, their usage patterns and awareness of side effects are not well studied.