The mechanism of action of "Terfenadine" (Seldane) is :

<p><strong>Sol.&nbsp;</strong><math><msub><mrow><mrow><mi>E</mi></mrow></mrow><mrow><mrow><mi>e</mi><mi>x</mi><mi>t</mi></mrow></mrow></msub><mo>&gt;</mo><mn>1.1</mn><mtext></mtext><mi mathvariant="normal">V</mi></math>&nbsp;, cell reaction is reversed<br>i.e.&nbsp;<math><mi mathvariant="normal">C</mi><mi mathvariant="normal">u</mi><mo>? </mo><msup><mrow><mrow><mi mathvariant="normal">C</mi><mi mathvariant="normal">u</mi></mrow></mrow><mrow><mrow><mn>2</mn><mo>+</mo></mrow></mrow></msup></math>&nbsp;anode<br><math><msup><mrow><mrow><mi mathvariant="normal">Z</mi><mi mathvariant="normal">n</mi></mrow></mrow><mrow><mrow><mn>2</mn><mo>+</mo></mrow></mrow></msup><mo>+</mo><mn>2</mn><msup><mrow><mrow><mi mathvariant="normal">e</mi></mrow></mrow><mrow><mrow><mo>-</mo></mrow></mrow></msup><mo>? </mo><mi mathvariant="normal">Z</mi><mi mathvariant="normal">n</mi></math>&nbsp;cathode</p>

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