|Image from Antique Cannabis Handbook|
I suppose alcohol as a cough suppressant ingredient is not too surprising since it is still used even today. See chart below.
Heroin and morphine are both narcotics. Though both are not used in strong prescription strength cough suppressants today, a different narcotic hydrocodone still is (tussionex). Hydrocodone is the narcotic found in vicodin narcotic pain killers.
Chloroform was used in some parts of the world to suppress cough until the late 1990s, its disuse due to evidence of carcinogenesis.
|compiled by Dr. Hanson|