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My sister smokes a lot for a long time and she does not plan to leave the cigarettes anytime soon. She has problems when affected with viral infection that attack upper respiratory paths. She takes a lot of antibiotics then and has a strong cough that is very persistent. Those cough remains for weeks even after the infection is gone. Is Dextromethorphan good for cough?

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This medication has anti coughing ability. It blocks the center for coughing in the brain, but it cannot help with coughing that is caused by smoking, emphysema and asthma. You should consult your doctor and see if the coughing is related to smoking or viral infection. A proper medication would be prescribed then.
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