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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 values below are standard apparent reduction potentials (E°') for electro-biochemical half-reactions measured at 25 °C, 1 atmosphere and a pH of 7 in aqueous solution. [ 1 ] [ 2 ] The actual physiological potential depends on the ratio of the reduced ( Red ) and oxidized ( Ox ) forms according to the Nernst equation and the thermal voltage .
Besides active site density, the electron configuration of M center in M-N 4 active site also plays an important role in the activity and stability of an oxygen reduction reaction catalyst. Because the electron configuration of M center can affects the redox potential, which determines the activation energy of the oxygen reduction reaction. To ...
7.5–15 mg 2 hours 20–40 hours CYP2D6, others No Quetiapine e: 25–200 mg 1.5 hours 7 hours d: CYP3A4 No (at low doses) Footnotes: a = For sleep/sedation. b = In adults. c Active metabolite nordoxepin half-life is 31 hours. d Active metabolite norquetiapine half-life is 9–12 hours. e Not recommended per literature reviews.
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. [5] [6]
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.
Both the oxidation and reduction steps are pH dependent. Figure 1 shows the standard potentials at pH 0 (strongly acidic) as referenced to the normal hydrogen electrode (NHE). 2 half reactions (at pH = 0) Oxidation 2H 2 O → 4H + + 4e − + O 2 E° = +1.23 V vs. NHE Reduction 4H + + 4e − → 2H 2 E° = 0.00 V vs. NHE
Pentaoxidane (H 2 O 5) is a byproduct of trioxidane production [2] and has also been synthesized by reaction among peroxy radicals at low temperature. [1] Hydrogen polyoxides containing up to 10 oxygen atoms have been studied theoretically, but those containing more than five oxygens are expected to be extremely unstable. [3]
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