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H 1 antagonists, also called H 1 blockers, are a class of medications that block the action of histamine at the H 1 receptor, helping to relieve allergic reactions.Agents where the main therapeutic effect is mediated by negative modulation of histamine receptors are termed antihistamines; other agents may have antihistaminergic action but are not true antihistamines.
Diphenhydramine, sold under the brand name Benadryl among others, is an antihistamine and sedative.It is a first-generation H 1-antihistamine and it works by blocking certain effects of histamine, which produces its antihistamine and sedative effects.
In the United Kingdom, Benadryl can be found as Benadryl Allergy Relief. The main ingredient in this medication is acrivastine. Acrivastine is a non-drowsy antihistamine used to relieve allergies. It can treat hay fever, hives, insect bites and stings, conjunctivitis and eczema. [8] Benadryl Allergy Relief contains 8 mg of acrivastine in each ...
The most common anaphylactic reactions are induced by foods, insect stings and medications. [23] Adrenaline is both a hormone and a medication which plays an important role in the body's "fight-or-flight" response (the acute stress response). It is used to treat anaphylaxis as it provides immediate symptomatic relief.
This is a list of drugs and substances that are known or suspected to cause Stevens–Johnson syndrome This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources .
This phenomenon can also be observed in adults who use the medication as a sleep aid. The prevalence of this paradoxical reaction is unknown, but research into the phenomenon suggests that it may be as a result of the medicine's interactions with the CYP2D6 enzyme , and that a metabolite of diphenhydramine may be to blame.
Antihistamines are drugs which treat allergic rhinitis, common cold, influenza, and other allergies. [1] 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]
Anaphylactoid reaction, non-immune anaphylaxis, or pseudoanaphylaxis, is a type of anaphylaxis that does not involve an allergic reaction but is due to direct mast cell degranulation. [ 10 ] [ 42 ] Non-immune anaphylaxis is the current term, as of 2018, used by the World Allergy Organization [ 42 ] with some recommending that the old ...