Be careful with chronic use of antihistamines. They can be very drying to mucus membranes and irritating these membranes may aggravate a dry cough. Also, harsh and prolonged coughing often perpetuates the cough, similar to scratching an itch on the skin. Try sipping hot liquids to soothe the throat and cough as infrequently and gently as possible. Occasionally stress and nervousness contribute to chronic coughs.
Acid reflux can cause irritation in the throat.
This sometimes helps acid reflux and coughing. Also, she should not eat several hours before bedtime to prevent reflux. Chronic coughs with no determined cause are not uncommon. Be sure she visits her physician on a regular basis to watch for any new developments. 882-7000 to make an appointment with a University of Missouri Health Sciences Center physician.