These drugs act as depressant and analgesic .
Thus they are commonly called pain killers.
They act on central nervous system and gastrointestinal tract e.g. Opium .
Opium is obtained from the dried latex of unripe capsules of white poppy plant , papaver somniferum .
The opium derivatives include morphine and codein , heroin , commonly called black or brown sugar .
Heroin is formed from morphine by acetylation
It is more powerful analgesic than morphine , but causes drug addiction .
Most dangerous opiate is heroin and is either smoked or inhaled or injected .
When heroin is injected intra venously it produces rapid response called rush .
The codein is a wild analgesic but causes syrup .
Asynthetic drug pethidine has similar effect to hose of opiates.
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