Dextromethorphan (DXM), a synthetic drug with effects similar to morphine, the FDA as a cough suppressant approved it in 1954. Manufacturers developed and began using it in cough medicine in the 1970s as a cough suppressant that would be less addictive and have less side effects then the narcotic codeine, which had been used as the active ingredient in cough syrup up to this time.
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