"All addictive substances impact dopamine directly or indirectly. Alcohol and heroin stimulate a receptor in the brain called the opiate receptor. Heroin binds directly to the opiate receptor, while alcohol triggers the release of naturally occurring endorphins, which then bind to the opiate receptor. Stimulation of the opiate receptor by heroin or alcohol-induced endorphins causes cells to release dopamine."
What kind of opiate are you using?
Opiates (Opium, Heroin, Morphine, Methadone, Codeine) are extremely powerful on their own, and much more so when combined with alcohol. Mixing the two substances significantly increases a person’s likelihood of overdose.
[FONT=PT Sans, Arial, Helvetica, sans-serif]What this means, In time, you will build up some resistance and need more to "feel" the effect, it doesn't mean that the substance endorphin isn't present in your system. Endorphin is the bodes internal morphine".
My own experience with Codein and Morphine is that it takes so little time before you wear off that "effect" before you go "numb", and don't feel like you even took something...but when i stopped taking it for a little while, say couple of weeks or less, after taking morphine and codeine depending on what I had available, id feel the effects again. (ps, I had prescription drug, due to an accident).
Id say stay off for some time and try again after your resistance is worn off a bit. Do you ever experience difficulty peeing? [/FONT]