Allegra, Zyrtec, Claritin, and Clarinex are non-sedating antihistamines that relieve symptoms like sneezing, runny nose, and itchy eyes. Promethazine is a first-generation antihistamine effective for allergies and motion sickness but can cause drowsiness. Astelin is an intranasal spray for allergic rhinitis, while Singulair helps manage allergic asthma and rhinitis by reducing airway inflammation. FML Forte and Ketotifen treat allergic conjunctivitis by reducing inflammation and stabilizing mast cells. Allergic reactions occur when the immune system overreacts to harmless substances, causing symptoms such as rash, hives, swelling, sneezing, and in severe cases, anaphylaxis. Allergic rhinitis causes nasal inflammation and symptoms like congestion, sneezing, and itchy eyes, which may be seasonal or year-round. Allergic conjunctivitis results in red, itchy, watery eyes. Allergic asthma leads to airway inflammation with wheezing and shortness of breath. Uncommon allergies include aquagenic urticaria (reaction to water), mosquito bite hypersensitivity, and alcohol-related reactions. Skin allergies such as dermatitis and hives involve redness, swelling, and itching, and are managed with moisturizers, antihistamines, and avoidance of triggers. Allergy treatments include antihistamines, nasal corticosteroids, decongestants, and immunotherapy. Proper management improves quality of life by reducing symptoms and preventing complications.