I have had a cough for a few days now, and have been using Delsym as directed, but it has not helped. I might also am starting to come down with a cold. I do not know if it would be better to take Dayqyill/Niquill or to look for a different medicine to help my couch. I do not want to take cold tablets too early, as I could be mistaking cold symptoms for seasonal allergies.