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The pharmacokinetics of cetirizine have been found to increase linearly with dose across a range of 5 to 60 mg. [3] Its C max following a single dose has been found to be 257 ng/mL for 10 mg and 580 ng/mL for 20 mg. [2] Food has no effect on the bioavailability of cetirizine but has been found to delay the T max by 1.7 hours (i.e., to ...
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.
Antihistamines that target the histamine H 1 -receptor are used to treat allergic reactions in the nose (e.g., itching, runny nose, and sneezing). In addition, they may be used to treat insomnia, motion sickness, or vertigo caused by problems with the inner ear. H 2 -antihistamines bind to histamine H 2 receptors in the upper gastrointestinal ...
Bilastine is an antihistamine medication used to treat hives (), allergic rhinitis and itchy inflamed eyes (allergic conjunctivitis) caused by an allergy. [6] It is a second-generation antihistamine and takes effect by selectively inhibiting the histamine H 1 receptor, preventing these allergic reactions. [7]
Cetirizine/pseudoephedrine (Zyrtec-D) is an antihistamine and decongestant formulation. 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 ...
Pharmacology. Cyclizine is a piperazine derivative with histamine H 1 -receptor antagonist (antihistamine) activity. The precise mechanism of action in inhibiting the symptoms of motion sickness is not well understood. It may have effects directly on the vestibular system and on the chemoreceptor trigger zone.
Cyproheptadine is a very potent antihistamine or inverse agonist of the H 1 receptor. At higher concentrations, it also has anticholinergic, antiserotonergic, and antidopaminergic activities. Of the serotonin receptors, it is an especially potent antagonist of the 5-HT 2 receptors.
Hydroxyzine. 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]