To Aid Upper Respiratory Health and Promote Clear Breathing. With its powerful aroma, Airways® Xtra Strength Powder opens the airways and eases breathing. Airways® Xtra Strength Powder should be added to the feed daily for horses stabled for long periods or those who are experiencing low level congestion, or irritation from dust in bedding and hay. For lower respiratory health or laboured breathing, complete a course of Coff-Less before maintaining on Airways® Xtra Strength Powder or use Coff-Less permanently for long term concerns.