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Levocetirizine, sold under the brand name Xyzal, among others, is a second-generation antihistamine used for the treatment of allergic rhinitis (hay fever) and long-term hives of unclear cause. [3] It is less sedating than older antihistamines. [ 4 ]
The unbound or free fraction of levocetirizine has been reported to be 8%. [7] The true volume of distribution of cetirizine is unknown but is estimated to be 0.3 to 0.45 L/kg. [9] [7] Cetirizine poorly and slowly crosses the blood–brain barrier, which is thought to be due to its chemical properties and its activity as a P-glycoprotein substrate.
Levocetirizine (Xyzal) Levomepromazine (low-potency typical antipsychotic) Loratadine (Claritin) Maprotiline (tetracyclic antidepressant) Meclizine (most commonly used as an antiemetic) Mianserin (tetracyclic antidepressant) Mirtazapine (tetracyclic antidepressant, also has antiemetic and appetite-stimulating effects; trade name: Remeron)
Indications and route of administration Antihistamines are generally indicated for the alleviation of conditions such as allergic rhinitis, allergic conjunctivitis, or atopic dermatitis. [ 9 ] Other indications may include nausea and vomiting.
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.
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]