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The unbound or free fraction of levocetirizine has been reported to be 8%. [1] The true volume of distribution of cetirizine is unknown but is estimated to be 0.3 to 0.45 L/kg. [3] [1] 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.
It is a fixed-dose combination drug containing 5 mg cetirizine hydrochloride and 120 mg pseudoephedrine hydrochloride for symptoms related to seasonal allergic rhinitis. [1] [2] [3] Cetirizine/pseudoephedrine gained approval from the U.S. Food and Drug Administration in 2001 as a prescription drug and became over-the-counter (OTC) in 2007. [4]
Levocetirizine is an antihistamine. It acts as an inverse agonist that decreases activity at histamine H1 receptors. This in turn prevents the release of other allergy chemicals and increases the blood supply to the area, providing relief from the typical symptoms of hay fever.
Sometimes, an online pharmacy may not be located in a country that is claimed. For example, one study of drug shipments claiming to be from Canada revealed many of the drugs actually originated in several other countries and were often false medications. [6] Minors can order controlled substances without adult supervision.
No over-the-counter cough medicines have been found to be effective in cases of pneumonia. [9] They are not recommended in those who have COPD, chronic bronchitis, or the common cold. [10] [2] There is not enough evidence to make recommendations for those who have a cough in cancer. [11]
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Depakene is the trade name for the same drug prepared without sodium. Desyrel – an atypical antidepressant used to treat depression and insomnia; Desoxyn (methamphetamine hydrochloride) – used to treat attention deficit hyperactivity disorder and exogenous obesity
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]