Hydrocodone is stronger than codeine, so my opinion is that hydrocodone cough syrup
would be generally considered more addicting.
As far as sedation, however, both Codeine and Promethazine
are known to cause sedation, as is hydrocodone, so this all depends on the patient and how he/she reacts to the various ingredients. Can't really say one would be more or less sedating than the other.
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