This antihistaminic drug can cause cardiac arrhythmia at high dose by blocking cardiac K+ channels. It is most likely to be:
Correct Answer: Astemizole
Description: The drugs which can cause QT prolongation and Torsades' de pointes and have been withdrawn from the market due to this reason are: C: Cisapride A: Astemizole T: Terfenadine You can remember CAT is cute, so these drugs cause QT prolongation.
Category:
Pharmacology
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