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Hydroxyzine, sold under the brand names Atarax and Vistaril among others, is an antihistamine medication. [8] It is used in the treatment of itchiness, anxiety, insomnia, and nausea (including that due to motion sickness). [8] It is used either by mouth or injection into a muscle. [8] Hydroxyzine works by blocking the effects of histamine. [9]
Time to peak Half-life b Metabolism Anticholinergic Diphenhydramine: 50 mg 2–3 hours 2–9 hours CYP2D6, others Yes Doxylamine: 25 mg 2–3 hours 10–12 hours CYP2D6, others Yes Hydroxyzine: 25–100 mg 2 hours 20 hours ADH, CYP3A4, others No Doxepin: 3–6 mg 2–3 hours 17 hours c: CYP2D6, others No (at low doses) Mirtazapine: 7.5–15 mg ...
H 1-antihistamines work by binding to histamine H 1 receptors in mast cells, smooth muscle, and endothelium in the body as well as in the tuberomammillary nucleus in the brain. Antihistamines that target the histamine H 1-receptor are used to treat allergic reactions in the nose (e.g., itching, runny nose, and sneezing).
A 10 mg dose of cetirizine equals about a 30 mg dose of hydroxyzine in terms of peripheral antihistamine effect.) [31] PET studies with antihistamines have found that brain H 1 receptor occupancy of more than 50% is associated with a high prevalence of somnolence and cognitive decline, whereas brain H 1 receptor occupancy of less than 20% is ...
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 ...
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Vistaril (hydroxyzine) – an antihistamine for the treatment of itches and irritations, an antiemetic, as a weak analgesic, an opioid potentiator, and as an anxiolytic; Vyvanse (lisdexamfetamine) – a pro-drug stimulant used to treat attention deficit hyperactivity disorder and binge eating disorder; Vyvanse is converted into Dexedrine in vivo
It is believed to work in part by anticholinergic and antihistamine mechanisms. [3] Meclizine was patented in 1951 and came into medical use in 1953. [5] It is available as a generic medication and often over the counter. [3] [6] In 2022, it was the 129th most commonly prescribed medication in the United States, with more than 4 million ...
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