What's the best cough suppressant?

No.14411668 ViewReplyOriginalReport
I'm getting over a cold and I have a lingering cough. I need to not be coughing at work tomorrow. My throat is sore from all the coughing too.
I drank like half a bottle of Delsym but still cough. What can I take that will make me not cough for like 8 hours?