Hi Thanks for posting your query on HCM I have read and understood your concern Respiratory infections may be of viral or bacteria origin.If of viral origin, symptomatic treatment will be enough.However, if your Doctor prescribed antibiotics, it means he had arguments in favour of bacteria infection.Since symptoms are persisting,i will advise you see the Doctor for reevaluation and if need be, a change of antibiotic may be considered.In the meantime, i will suggest you: -Continue with mucinex -Take an antihistamine like benadryl -A steroid like prednisolone -Avoid respiratory irritants like dust, cold and smoke Hope this will help.You may write back if more concerns. Best regards Dr Mbuomboh