Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works for me but must start immediately on a scratchy throat

Seems to work for me. Once my colds get started I am headed for two weeks at least, longer if it gets into my lungs. About a year ago I started to get a sore throat and bought a box right away on impulse. I was VERY surprised that they actually worked. No other remedy has worked for me before. It seems to stop the progress of the cold from my throat into my sinuses. This is consistent with the theory that it stops the virus from propagating, allowing the body time to get the upper hand in fighting the infection. This would also explain why it is essential to start right away in the early stages of the cold. The sore throat will still last the usual length of time - a day or two.