My mother is going through intense dry cough attacks at night especially. It all started 2 years back with coughing at night which used to get ok with macberry cough syrup but since a month now nothing is working. Coughing keeps her awake. Chest x ray is normal and complete blood test is normal also ammonia breath test is also normal. Going by the symptoms I think it is gerd even though she does not has heartburn. Please suggest proper medicine for this gerd induced cough. She takes rabeprazole capsule whenever her stomach is upset.