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.
Learn what you need to do to prepare for your colonoscopy: 1  Three days before your colonoscopy, eat only low-fiber foods. 2  Two days before, continue eating only low-fiber foods. 3  One day before, go on a clear-liquid diet.  The evening before, drink half of a prescription laxative drink to clean out your colon for the procedure.