The above mentioned drugs belongs to the category of drugs called narcotic analgesics.
What are analgesics?
Analgesics are those drugs that are known as painkillers because they are used for relieving pains affecting an individual in or on the body.
The narcotic analgesics are also called opioids because they act on the opioid receptors to relieve pains.
Therefore, Morphine, opium, codeine, and heroin belong to the category of drugs called narcotic analgesics.
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