How to useAzelastine generally is used as sprays in each nostril twice daily. Store Astelin at room temperature in an upright position, away from moisture and heat. For complete information about this product or your specific health needs, ask your health care professional. If necessary, CR suggests trying to dry up the postnasal drip that causes cold-related coughs with an older antihistamine, such as chlorpheniramine Chlor-Trimeton or diphenhydramine Benadryl Allergy. Security The security of your Personal Information is very important to us. Berger, MD, MBA, is Medical Director of kup astelin Allergy and Asthma Associates of Southern California and of Southern California both facilities are located in Mission Viejo, California.