Byline: DR. S.M. ALAM and DR. M.A. KHAN Opium is the dried narcotic juice of the white poppy. Drugs like heroin, codeine and opium are included in this group. The common action of these drugs on the nervous system is that brain control of bodily organs is lost. The brain is badly damaged due to their use and the nerves get loosened. Feeling for hunger is lost and one suffers from constipation.