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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.
Histamine intolerance, in contrast to histamine intoxication, is a presumed disorder that affects individuals who are supposed to have a reduced or impaired activity of the histamine-degrading enzymes, either due to genetic factors, medications, or gastrointestinal diseases.
Cimetidine was the prototypical histamine H 2 receptor antagonist from which later drugs were developed. Cimetidine was the culmination of a project at Smith, Kline & French (SK&F; now GlaxoSmithKline) by James W. Black, C. Robin Ganellin, and others to develop a histamine receptor antagonist that would suppress stomach acid secretion.
The medication works by blocking histamine H 1 receptors, mostly outside the brain. [6] Cetirizine can be used for paediatric patients. The main side effect to be cautious about is somnolence. [9] It was patented in 1983 [10] [11] and came into medical use in 1987. [12] It is on the World Health Organization's List of Essential Medicines. [13]
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.
An H 3 receptor antagonist is a type of antihistaminic drug used to block the action of histamine at H 3 receptors.. Unlike the H 1 and H 2 receptors which have primarily peripheral actions, but cause sedation if they are blocked in the brain, H 3 receptors are primarily found in the brain and are inhibitory autoreceptors located on histaminergic nerve terminals, which modulate the release of ...