Codeine / promethazine
cough
"I get much better results from mucinex or a cough suppressant and decongestant at night. It's worth noting that some people are incapable of making enough of the enzyme CYP2D6 to break down the codeine for your body to use. I'm pretty sure I'm one of those people.  I have acute bronchitis. What's helped is warm showers and breathing in the steam through my mouth. I've used mucinex,  alkazeltzer severe cold and flu,  and theraflu. They work when they feel like it.  The alkazeltzer knocks me out for the night. Sleeping propped up next to a humidifier helps too."