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Opioids cough suppressants are really not appropriate for a long-term cough, except when it's serious and "enough is enough" and you absolutely are suffering without it. Lung and throat cancer, for example.
Otherwise, they're appropriate for short-term use. In an upper respiratory infection, the lungs may remained inflamed for up to 2 months.
The reason I say "appropriate" is not because I care whether someone is taking an opioid or not, it's because they dramatically lose their effectiveness as cough suppressants (yet still keep the "other" effects) when used long-term.
Doctors know this, and if you try to endlessly refill your Hycodan/Tussionex, they will know what's up. They will know it's not working for the cough anymore. And unless it's truly neccessary, they won't want to increase the dose substantially and keep doing it.
Asthma does cause non and mildly productive coughs at night. Properly controlling your asthma is the way to fix this. Using your inhaler at night doesn't work? Have you taken Advair in high doses, like the 500/100?
Unless you're elderly, it's rare to have cough as your primary complaint. Is it possible you live in an area with high pollution? Is it possible you've developed an allergy? Is it possible you are exposed to workplace irritants or were at one time? All of these are reasons for a continued cough.
What color is the phlegm you're bringing up? It could possibly be chronic sinusitis.
My advice would be to get a referral to an otolaryngologist (aka ENT- ear, nose, and throat doctor), if you already know your asthma is in check and don't need a pulmonologist. They are professionals who are qualified to look into this more closely.