Hello my friend,
There are many cleanses on the market which will cleanse your system, but the fastest one that I know of is activated charcoal. This can be purchased at most health food stores and needs to be started right away. Activated charcoal has been used in the past to cleanse the body after poison has been ingested. It works fast by absorbing all the toxins in your system and flushing them out typically within 24-48 hours you could have a clean system. However this should not be used on a regular basis because it can absorb vital nutrients as well. If you have any questions contact your doctor otherwise this should work. Please le me know if you need additional information.
My understanding of a barbitute is a drug that acts as a central nervous system depressant. No activated charcoal is not a barbitue, it is a products that absorbs poisons, toxins, drugs and gets them out of your body with the assistance of water. You can buy it at a health food store and it should work in 24 to 48 hours depending on how much you have in your system. It could work even sooner.