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Benadryl Allergy. Benadryl Allergy is the name of a Benadryl product found in the United States and Canada. It is an antihistamine drug used to relieve allergies. Its active ingredient is diphenhydramine, a first-generation antihistamine. It is known to be sedative, making drowsiness a common side effect.
Common side effects include sleepiness, headache, and a dry mouth. [8] [9] Serious side effects may include QT prolongation. [9] It is unclear if use during pregnancy or breastfeeding is safe. [8] Hydroxyzine works by blocking the effects of histamine. [9] It is a first-generation antihistamine in the piperazine family of chemicals. [8] [4]
Diphenhydramine ( DPH) is an antihistamine and sedative mainly used to treat allergies, insomnia, and symptoms of the common cold. It is also less commonly used for tremors in parkinsonism, and nausea. [ 11] It is taken by mouth, injected into a vein, injected into a muscle, or applied to the skin. [ 11]
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Levocetirizine, sold under the brand name Xyzal, among others, is a second-generation antihistamine used for the treatment of allergic rhinitis (hay fever) and long-term hives of unclear cause. [ 3] It is less sedating than older antihistamines. [ 4] It is taken by mouth.
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Typically, people take antihistamines as an inexpensive, generic (not patented) drug that can be bought without a prescription and provides relief from nasal congestion, sneezing, or hives caused by pollen, dust mites, or animal allergy with few side effects. [ 1] Antihistamines are usually for short-term treatment. [ 1]
Azelastine, sold under the brand name Astelin among others, is a H 1 receptor-blocking medication primarily used as a nasal spray to treat allergic rhinitis (hay fever) and as eye drops for allergic conjunctivitis. [ 5][ 6] Other uses may include asthma and skin rashes for which it is taken by mouth. [ 7] Onset of effects is within minutes when ...