Delsym is the only thing that works to stop my 5 year old daughter's cough. My daughter has post nasal drip from allergies and she can be fine all day, but when she lays down to go to sleep she starts coughing. The cough can get so bad, it forces her to throw up. Delsym is the only thing that stops the cough and lets her sleep all night. It has a bad taste, but she's gotten used to it, and she can sleep all night without coughing. I highly reccomend it!