Aerius has been studied in a total of eight studies involving about 4,800 adult and adolescent patients with allergic rhinitis (including four studies in seasonal allergic rhinitis, and two studies in patients who also had asthma). The effectiveness of Aerius was measured by looking at the change in the symptoms (nasal discharge, itching, sneezing and congestion) before and after two or four weeks of treatment.
Aerius has also been studied in 416 patients with urticaria. The effectiveness was measured by looking at the change in the symptoms (itching, number and size of hives, interference with sleep and daytime function) before and after six weeks of treatment.
In all studies, the effectiveness of Aerius was compared with that of placebo (a dummy treatment). Additional studies were presented to show that the syrup, oral solution and orodispersible tablets are treated by the body in the same way as the tablets, and to show that they can be used safely in children.