Hello, Thanks for the query to H.C.M. Forum. If I were your treating doctor for this dry cough , I would come up with following possibilities , these includes. 1 Asthmatic allergic bronchitis , diagnosis can be confirmed by clinical as well physical examination by a physician . In such type of symptoms usually there develops , wheezing sound , dry cough , bronchoconstriction , running nose , breathlessness . All these symptoms , you are having , so you may have asthmatic allergic bronchitis. 2 Tuberculosis , in the beginning there may be such type of symptoms , if allergy is associated with tuberculosis . Diagnosis can be confirmed by chest X ray , Blood for E SR . In my opinion first of all consult a physician and get his opinion ( 2nd) as in your case cefotaxim ( omnicef ) is ineffective , so consult at once. Good luck. Dr. HET