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In one study, a more acidic pH of 5.0 resulted in a half-life of 3.0 to 6.4 hours, whereas a more alkaline pH of 8.0 resulted in a half-life of 9.2 to 16.0 hours. [11] Substances that influence urinary acidity and are known to affect the excretion of amphetamine derivatives include urinary acidifying agents like ascorbic acid and ammonium ...
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 .
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. Due to its near complete metabolism by the liver immediately after leaving the gut, terfenadine normally is ...
Loratadine's peak effect occurs after 1–2 hours, and its biological half life is on average eight hours (range 3 to 20 hours) with desloratadine's half-life being 27 hours (range 9 to 92 hours), accounting for its long-lasting effect. [33] About 40% is excreted as conjugated metabolites into the urine, and a similar amount is excreted into ...
Purdue Pharma L.P. Purdue Pharma L.P., formerly the Purdue Frederick Company (1892–2019), was an American privately held pharmaceutical company founded by John Purdue Gray. It was sold to Arthur, Mortimer, and Raymond Sackler in 1952, and then owned principally by the Sackler family and their descendants. [1][2] The company manufactured pain ...
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