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Question: Please explain how a cough suppressant can also act as an expectorant. If you're suppressing the mucus that makes you cough, how can you also expectorate it? Doesn't one action negate the other? Leslee

Answer: Dear Leslee,

Cough suppressants act on the part of the brain that controls the cough reflex. They only relieve dry, coughs and are not meant to treat coughs that bring up mucus.

Cough suppressants that contain also a expectorant do in fact cancel each other's effects, as the suppressant does not allow the body to cough up the mucus that has bee loosen up by the expectorant.

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