Examples include heroin, hydrocodone, and hydromorphone. Fully synthetic opioids are not derived from an opiate but still bind the opioid receptor. Examples include fentanyl and methadone [2]. Opioids are often used medically for pain relief but are also used non-medically for their psychoactive and euphoric effects.
A clear liquid diet on the day before your colonoscopy helps clear out your intestines, as well as helping to maintain your hydration.
Report Abuse. 1  Water is a clear liquid and that's what you should probably stick with. 2  I definatly wouldn't! 3  Usually the doctor asks you to fast about 12 hours before the colonoscopy is performed.  No, you can't have any alcohol the night before this procedure. You don't want to take any chances of having a reaction when they put you to sleep to do the procedure. jackie_jabar Â· 9 years ago.