Immunotherapy - Reduces sensitivity to allergens - usually used for chronic hay fever. A series of injection given over several years, giving tiny doses if the antigen of which a person is allergic to, increasing doses over time means the immune system become less sensitive to it.
Antihistamines - Comes in many forms and has been used to treat allergy symptoms for many years. They are available over the counter and through prescription for those with chronic symptoms. Examples consist of Benadryl and Claritin.
Decongestants - Relieves congestion. Can only be used for a few days. Examples consist of sedated tablets, Zyrtec-D. Used for blocked noses and swollen blood vessels in the eye, along with mucous secretion.
Combination Allergy drugs - Contain both antihistamine and decongestant to relieve multiple symptoms. Other combinations are also available. Examples consist of Benadryl Allergy and Sinus and Tylenol Allergy and Sinus.
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