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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 ...
Hydroxyzine works by blocking the effects of histamine. [9] It is a first-generation antihistamine in the piperazine family of chemicals. [8] [4] Common side effects include sleepiness, headache, and dry mouth. [8] [9] Serious side effects may include QT prolongation. [9] It is unclear if use during pregnancy or breastfeeding is safe. [8]
Mirtazapine (Remeron) is an antidepressant that also has antiemetic effects. [5] [6] It is a potent histamine H1 receptor antagonist, K i =1.6 nM, [7] and also exhibits notable 5-HT 3 antagonism. [6] Meclizine (Bonine, Antivert)
The H 1 receptor is a histamine receptor belonging to the family of rhodopsin-like G-protein-coupled receptors.This receptor is activated by the biogenic amine histamine.It is expressed in smooth muscles, on vascular endothelial cells, in the heart, and in the central nervous system.
The most common side effects include headache, back and muscle pain, miosis or pinpoint pupils, nausea, drowsiness, and menstrual cramps. Anxiety and insomnia have also been rarely reported. The most common side effects demonstrated during clinical trials were cough , upper respiratory tract infection , fever , and otitis media for children ...
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Side effects of doxylamine include dizziness, drowsiness, and dry mouth, among others. [4] Doxylamine is a potent anticholinergic and has a side-effect profile common to such drugs, including blurred vision , dry mouth, constipation , muscle incoordination , urinary retention , mental confusion , and delirium .
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