I regularly take celexa and seroquel, and since I've been having health issues, where my main 'symptom' is coughing, I also take codeine (good thing you can get codeine #1 here OTC) to help stop coughing. With all these meds, I thought I'd be in snooze city, but no. Infact, i have trouble sleeping through the night and during the day - my stuffy head makes me tired, not meds. My question is....

Is it possible to develop a tolerance to these meds?

I don't want to go back to the doctors because all they'll do is say - sorry, can't help, or start me back on steroids, which is what I don't want.