Thebaine is a naturally occurring non-addictive, non-narcotic alkaloid contained in opium. It is coloured red by concentrated sulphuric acid and is very poisonous, causing severe convulsions by its action on the spinal cord and generally resembling strychnine in its results. However, it can also be used to produce codeine and other pain killers, and is very difficult to derive morphine (from which opium is produced) from it. Research Thebaine