A member asked:

Coughing up black phlegm when on antibiotics help?

A doctor has provided 1 answer
Dr. Alvin Lin answered

Follow up w/your doc: We used to determine need for antibiotics based upon phlegm color, but no more, as it really makes no difference. I assume your black phlegm hasn't changed in color since starting antibiotics. Sometimes, it just takes a while to get better. If you have a viral infection, antibiotics won't help (but best to finish whatever you've started). Bottom line, follow up w/doc who prescribed antibiotics.

Answered 12/2/2013

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