| Heroin | - Heroin is commonly called smack and is chemically diacetylmorphine which is a white, odourless, bitter crystalline compound.
- This is obtained by acetylation of morphine.
- Generally taken by snorting and injection, heroin is a depressant and slows down body functions.
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| Marijuana | - This is isolated from Cannabis sativa.
- Cannabinoids are a group of chemicals (Figure 8.9), which interact with cannabinoid receptors present principally in the brain.
- Generally taken by inhalation and oral ingestion, these are known for their effects on cardiovascular system of the body.
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| Cocaine | - Coca alkaloid or cocaine is obtained from coca plant Erythroxylum coca.
- It has a potent stimulating action on central nervous system, producing a sense of euphoria and increased energy.
- Excessive dosage of cocaine causes hallucinations.
- It interferes with the transport of the neuro-transmitter dopamine.
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| Morphine | - Opioids are the drugs, which bind to specific opioid receptors present in our central nervous system and gastrointestinal tract.
- Morphine is a very effective sedative and painkiller, and is very useful in patients who have undergone surgery.
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