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Overview
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Background
Terfenadine is a histamine H1-receptor antagonist, which blocks HERG and KATP (KIR6) channels. The IC values for Terfenadines inhibitory activity against these channels is 204nM for HERG and 1.2µM for KATP. Studies show that Terfenadine inhibits the delayed rectifier K+ in ventricular myocytes. Terfenadine is converted into its more active form, terfenadine carboxylate by the enzyme CYP3A4.
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- Properties
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Overview