For 4 weeks I have had an itchy, irritated throat which causes occasional involuntary coughing. Any attempt to laugh also causes an outbreak of involuntary coughing.The cough is fairly dry, but I do experience some mucous build up in the throat which causes some loss of voice, and forces me to try and clear my throat every two or three minutes. I tried a 5 day course of Dalacin without success, and a local Doctor also prescribed a 7 day course of Prednisolone, but, again, no success. Not sure if relevant, but I have had a slight post nasal drip for about 2 years which no local medical facility has been able to eradicate. Any advice or help you can offer would be much appreciated.