Some 8 years ago I was prescribed Cephalexin for a serious chest infection and they really did the business, so continue. Whilst I am loth to contradict the Lady of the Manor, do not on any account ask your pharmacist for advice. His job is to dispense the prescription of your GP - he is not a diagnostician. I don't know how true it is today, but when I was a child most, if not all, pharmacists were failed medical students thrown off the bachelor of medicine course and trained in pharmacy as a sop.