Last year's weather phenomenon produced an early spring and late autumn, keeping ragweed and goldenrod in the fields longer than retailers could keep antihistamines on the shelves. Unusual weather patterns are not the only factor driving continued growth for the category in recent years. Close to one in five Canadians suffer from allergies, defined as a generalized overreaction of the immune system to a trigger, such as a particular food or pollen. Traditional and non-sedating antihistamines offer different performance benefits, says Lachmansingh, and consumers tend to remain loyal to their brand. Some people are finding traditional antihistamines are the heavy guns and provide more relief.
Combination products are among the latest allergy treatments on pharmacy shelves.
Pfizer recently introduced Reactine Plus, containing a Reactine Extra Strength tablet for allergy relief and a Reactine Sinus Decongestant caplet for sinus congestion, in a single dose. Herbal decongestants are also a recent addition to the category. Keep in mind that these products generally only relieve a stuffy nose, and don't treat the underlying cause of symptoms, says Lachmansingh. Physicians often recommend low-dose antihistamines such as Reactine 5 mg for elderly patients, says Piacek. As metabolites, such products do not need to be processed by the liver before the onset of action, which allows for easier renal clearance.