This medication is used for the temporary relief of runny/stuffy nose, watery/itchy eyes, and itchy throat that may be caused by allergies, hay fever, the common cold, sinus inflammation (sinusitis), and other breathing illnesses. The decongestant relieves the stuffy nose. The antihistamine relieves the itchy/watery eyes and itchy throat. The anticholinergic has a drying effect that decreases a runny nose and fluid in the sinuses that runs down your throat causing discomfort.

Source: http://www.webmd.com/drugs/drug-16402-Rescon+Mx+Oral.aspx?drugid=16402&drugname=Rescon+Mx+Oral