<prompt> True statement about fexofenadine is :It undergoes high first pass metabolism in liverTerfenadine is an active metabolite of this drugIt does not block cardiac K channelsIt has high affinity for central H1 receptors  <response>: Fexofenadine is an active metabolite of terfenadine. It lacks K channel blocking property, therefore is devoid of arrhythmogenic potential. It is available as a separate second-generation H1 blocking agent. 