I was diagnosed 8 yrs ago with LSN. Spent two years taking different meds the ENT prescribed for it but none of them helped at all. Then went to a lung doctor. He said I didn't have LSN and had been misdiagnosed and actually had COPD and asthma. I spent a year taking his prescriptions and nothing helped. I then went to a gastroenterologist. They wanted to do tests for GERD. Instead of the invasive tests I asked to just be put on the meds they would prescribe if I actually had GERD and we would see if they helped. They were PPI's and I took them as prescribed and they did nothing for the cough, thus I assumed I don't have GERD. I happened to see a doctor, husband of a friend of mine, and he said to take 40 mg of laratadine a day...either two in the morning, two at night, or spread throughout the day. This has worked the best of all, although I still cough several times a day, but none at night. Laratadyne is an over the counter allergy med, very inexpensive. Of everything I've tried this works the best. Good luck.