For cough relief, Manuka honey is generally what most people swear by, Comvita is a brand that comes up a lot, and the key is to get one with a high UMF rating (UMF 15 and above is what's usually recommended). A friend mentioned her PD actually suggested Manuka honey as a complement to medication, especially for nighttime coughing. Do check with your own PD first though, just to be safe!