What’s the difference between an antihistamine and a decongestant?

ABC News chief medical correspondent Dr. Jen Ashton answers your health questions. SUBSCRIBE to GMA's YouTube page: https://bit.ly/2Zq0dU5 VISIT the GMA3 homepage: https://bit.ly/3kNlst8 FOLLOW GMA3: Facebook: https://www.facebook.com/abcgma3 Twitter: https://twitter.com/abcgma3 Instagram: https://instagram.com/abcgma3 #allergies #antihistamine #decongestant #gma3