<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a cough that is caused by the feeling of a dust particle in the back of my throat. I cough to clear the throat . It is a dry cough. But one cough often leads to more immediate coughing for 6 to 8 coughs. Sinuses are clear, no mucous. Very irritating. Age 67, no allergies, and in good health. Normal weight.  <response>: Hellos you mentioned that you are having Chat Doctor. This means either some sort of allergy or throat infection. When such type of patient visit I usually advise them to take dextromethophan chclopheniramine male ate guaiphenesine cough syrup 2-3 T S F three times in day. Take some dextromethorphan longer for throat clearance. Take some antibiotics like among clavulanic acid three times in day. This treatment will cure within 5-7 days. Avoidance of dust, mite, pollen, molds will help. Hot coffee also provide relief. Hope this will help you. Still no relief within 7 days, consult a physician and get his opinion. 