Receive a free Xyzal Allergy 24HR Sample in the mail! Just fill out your shipping information, click ¡°Continue¡±, select free shipping and click ¡°Complete¡±. Xyzal is the latest in OTC allergy relief. Take it at night to relieve allergy symptoms while you sleep and get continuous relief that¡¯s just as effective at hour 24 as at hour 1. While supplies last.