If you are off the grid or maybe if you are cutting out commercial OTC meds, you might want to try your hand at this great DIY Licorice Cough Syrup the next time you are sick.
It's pretty easy to make and personally, I feel that it works better than the OTC stuff. I say this because it really coats your throat and gets that "tickle" to go away quickly so you can sleep.
Make sure you store it in a dark bottle. I have found it seems to last longer when you do.