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Aller-Chlor A trade name for chlorpheniramine maleate, used as an antihistaminic agent.

Allerdryl A trade name for diphenhydramine hydrochloride, used as antihistaminic agent.

Allergen An antigen capable of provoking production of IgE antibodies that bind to the mast cells. Subsequent exposure to allergen causes mast cell degranulation and release of histamine leading to allergic reactions.

Allergenic Pertaining to a substance capable of causing allergic reactions.

Allergesic A trade name for a combination drug containing phenylpropanolamine hydrochloride and chlorpheniramine maleate.

Allergex A trade name for chlopheniramine maleate, used an antihistaminic agent.

Allergic Asthma A form of asthma caused by the exposure of the bronchial mucosa to an inhaled airborne allergen. It is an IgE-mediated allergic reaction.

Allergic Contact Dermatitis An inflammation of the skin due to exposure to a chemical sensitizer.

Allergic Reaction The antigen-antibody mediated allergic reactions. There are four main types of allergic reactions, e.g., type I hypersensitivity (IgE mediated); type II (antibody-dependent cyto-toxic reaction); type III (soluble antigen-antibody-complex mediated hypersensitivity); type IV (delayed type hypersensitivity).

Allergic Rhinitis An allergic disorder of humans caused by pollen, house dust, animal dander, or spores of fungi; characterized by wheezing, sneezing, coughing, copious flow of watery discharges, itching nose, mouth, excessive flow of tears, headache, and insomnia (also called hay fever and pollenosis).

Allergoids Chemically modified allergens that provoke the production of IgG antibody (not IgE), thereby reducing allergic symptoms.

Allergy An immunological hypersensitivity reaction resulting in tissue inflammation and organ dysfunction. Allergies are classified into four main types: Types I, II, III, and IV hypersensitivity. Types I, II, and III involve immunoglobulin antibodies and their interaction with different antigens. Type IV allergy is associated with T cells that react directly with antigen and cause local inflammation.

AllerMax A trade name for diphenhydramine hydrochloride, used as an antihistaminic agent.

Allicin (mol wt 162) An antibacterial agent from garlic (Allium sativum)

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