OTC cough drops are candy. They rarely contain anything more than a sugar and flavoring. The sugar is thought to coat the throat to stop the spasms from dryness or sloughing cells.
Cough drops that contain opioids relax the central nervous system and reduce muscle spasms that lead to coughing fits.
Cough medicine in general has little impact on coughing and cold medicines often combine both a cough suppressant with an expectorant. How the heck are you supposed to not cough while expectorating (releasing )phlegm ? Dumb
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