I am a 41 yrs old female, suffering from dry cough for last 10 days, which is worse at night, unable to sleep properly for last 4-5 days, is not responding to dextromethorphan or codiene containing syrups. I already had a course of antibiotics ( amoxycillin+ clavulanic acid) for 5 days. no fever, History of bronchial asthma in mother. Kindly tell treatment and preventive measures to be taken in future.