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.
If your doctor says you can drink some alcohol before your colonoscopy, minimize the amount you consume and do not drink red wine or other alcoholic beverages that are red or purple. The color may be confused with blood during the colonoscopy. Several hours before the exam, you are not permitted to eat or drink.