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Histamine intolerance is a presumed set of adverse reactions (such as flush, itching, rhinitis, etc.) to ingested histamine in food. The mainstream theory accepts that there may exist adverse reactions to ingested histamine, but does not recognize histamine intolerance as a separate medical condition that can be diagnosed. [1]
Once released, the histamine can react with local or widespread tissues through histamine receptors. [citation needed] Histamine, acting on H 1-receptors, produces pruritus, vasodilation, hypotension, flushing, headache, bradycardia, bronchoconstriction, increase in vascular permeability and potentiation of pain. [2]
Histamine also promotes angiogenesis. [6] Antihistamines suppress the histamine-induced wheal response (swelling) and flare response (vasodilation) by blocking the binding of histamine to its receptors or reducing histamine receptor activity on nerves, vascular smooth muscle, glandular cells, endothelium, and mast cells.
Loss of libido and erectile dysfunction can occur during treatment with histamine H 2 receptor antagonists such as cimetidine, ranitidine, and risperidone. [38] The injection of histamine into the corpus cavernosum in males with psychogenic impotence produces full or partial erections in 74% of them. [ 39 ]
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 ...
Cimetidine, sold under the brand name Tagamet among others, is a histamine H 2 receptor antagonist that inhibits stomach acid production. [1] [9] [10] It is mainly used in the treatment of heartburn and peptic ulcers. [1] [10] [11]