If you are still experiencing symptoms despite your efforts to avoid allergens, you might explore medication options. Regardless of which medications you select, read the product labels and know the side effects. The following list includes the most common allergy treatments (both over-the-counter and prescription) and the specific allergic conditions they treat.
Antihistamines -- As the name implies, antihistamines counter the effects of histamine released during an allergic reaction. They are widely used to treat many allergy-related conditions. They are often combined with decongestants and are available in a variety of over-the-counter formulas (e.g., Actifed, Benadryl, Contac, Drixoral, Tavist-D, Triaminic) and by prescription (e.g., Allegra, Clarinex, Zyrtec). Antihistamine nasal sprays are also available to treat allergic rhinitis (e.g., Astelin). Antihistamine eye drops may also be used for quick relief of itchy eyes associated with allergies (e.g., Naphcon-A).
Decongestants -- If you experience nasal congestion (stuffy nose) due to allergies or sinusitis, consider oral or nasal spray decongestants for relief. Decongestants are also included in eye drops to decrease redness caused by conjunctivitis (e.g., Albalon). They work by constricting blood vessels and reducing swelling. Be careful when using some nasal spray decongestants. If you use them for a prolonged period (longer than 3-4 days), you may experience a "rebound" effect, where nasal congestion symptoms return.
Corticosteroids -- These anti-inflammatory agents are used to treat the itching and swelling associated with a variety of allergic disorders. The most commonly used forms are corticosteroid nasal sprays for allergic rhinitis and sinusitis (e.g., Flonase, Nasalide, Nasocort, Nasonex, Rhinocort), over-the-counter topical corticosteroid creams for hives, dermatitis, and insect sting reactions, and inhaled corticosteroids for asthma. Liquid corticosteroids are used less frequently for more severe cases of asthma.
Cromolyn Sodium/Nedocromil Sodium -- These are another type of anti-inflammatory medication. Cromolyn sodium nasal spray can be used to treat and sometimes prevent allergic rhinitis. It works by preventing the release of histamine from mast cells. Cromolyn nasal spray is available over the counter and is gentle and effective. It generally takes a few days to start working. Eyedrop versions are available for itchy, bloodshot eyes. Inhaled nedocromil sodium is used to treat inflammation due to asthma, which can be exacerbated by allergies.
Epinephrine -- Epinephrine (adrenalin) is used for emergency treatment in cases of anaphylaxis due to insect sting, food, or drug allergies. It is most commonly administered with a device called an EpiPen, which is a self-injectable shot of epinephrine. Epinephrine constricts the small blood vessels in the skin and mucous membranes, which increases blood pressure and heart rate back to normal levels. Epinephrine also is an antihistamine.
