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Fexofenadine, sold under the brand name Allegra among others, [10] is an antihistamine pharmaceutical drug used in the treatment of allergy symptoms, such as hay fever and urticaria. [ 11 ] Therapeutically, fexofenadine is a selective peripheral H 1 blocker .
The time to reach maximum concentration (T max) of hydroxyzine is about 2.0 hours in both adults and children and its elimination half-life is around 20.0 hours in adults (mean age 29.3 years) and 7.1 hours in children. [5] [6] Its elimination half-life is shorter in children compared to adults. [5]
It contains fexofenadine, as the hydrochloride, an antihistamine; and pseudoephedrine, as the hydrochloride, a nasal decongestant. [ 2 ] In 2021, it was the 279th most commonly prescribed medication in the United States, with more than 800,000 prescriptions.
Terfenadine acts as a peripherally-selective antihistamine, or antagonist of the histamine H 1 receptor. [3] It is a prodrug, generally completely metabolized to the active form fexofenadine in the liver by the enzyme cytochrome P450 3A4.
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.
The drug is bound to albumin with high affinity, while α 1-acid glycoprotein and lipoproteins contribute much less to total plasma protein binding. [1] 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.
An example hydroxylation reaction involves the oxidation of barbituric acid to alloxane. [9] Another application of the reagent in organic synthesis is in coupling reactions of alkanes. As an example tert -butanol is dimerized with Fenton's reagent and sulfuric acid to 2,5-dimethyl-2,5-hexanediol. [ 10 ]
Pheniramine (trade name Avil among others) is an antihistamine with anticholinergic properties used to treat allergic conditions such as hay fever or urticaria.It has relatively strong sedative effects, and may sometimes be used off-label as an over-the-counter sleeping pill in a similar manner to other sedating antihistamines such as diphenhydramine.
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related to: fexofenadine h1 or h2 reaction with alcohol concentration acid formula- 109 S High St #100, Columbus, OH · Directions · (614) 224-4261
"Your pet's prescription needs met at a price you can afford." - Patch