One would think that the medication that makes cough syrup effective does so by improvng the situation causing the cough reflex. That is a pipedream. The medication in cough syrup is a chemical that shuts down the neurological center in the brain responsible for triggering the diaphram when the lungs need the cough. For the record, I am fully opposed to shutting down neurological centers in my brain, however, there are exceptions to every rule. Coughing prevents breathing. I like breathing. Bring on the Robitussin and good night little neurons... I'll see you in seven hours when the chemicals wear off.
Fun Fact: In the late 1800's to the early 1900's, heroin was the cough suppressant du jour.

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