60 year old negro woman, diabetesType 2, HBP history, numbness in left heel, on Pioglit and Amaryl. Was on Glucophage before Pioglit. Cronic cough. Had a round of antibiotics to combat chest infection but the cough persists. What's causing the cough Additional Details2 weeks agoMerely corroborative information.
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The cough could be caused by anything. You said she has chronic cough, but I didn't hear anything about history of asthma or COPD. If the cough was chronic, one worries about chronic bronchitis. The only way to diagnose that is to do further testing by a pulmonologist. Anything from infections to drug effects could do it.

If she is a diabetic, she might be on an ACE Inhibitor to help control BP or proteinuria. That can be a cause of chronic cough.