Allergic rhinitis (allergic inflammation of the nose) is a common medical condition which is
known to seriously decrease quality of life, aggravate preexisting conditions particularly
asthma, carry significant medical treatment costs and be responsible for reduced work
productivity and lost school days. A significant symptom of the condition, nasal blockage,
remains difficult to treat even when using nasal corticosteroids. Decongestant medications
act on the blood vessels in the nose and have an immediate effect in clearing a blocked nose
but if used for more than seven days a more severe rebound congestion of the nose develops.
In this study, the investigators aim to assess the effects of doxazosin, a drug which is
currently used to treat high blood pressure and symptoms of prostate enlargement, to find out
if it has an effect on nasal blockage.