These substances became popular in the United States appeared when the first laws prohibiting alcohol, opium and morphine.
Its use can cause injury to the liver or kidneys, Skin rash, joint pain, neuralgia, hypotension, constipation, and tendency to circulatory collapse.
Acute poisoning can cause death, which occurs as brain injury due to lack of oxygen and other complications of respiratory depression.
Physical dependence is generated between four and six weeks. Often raises withdrawal delirium tremens boxes.
Big narcotics
There are several substances used in general anesthesia which deserve to be included in this group by their ability to produce drowsiness or stupefaction, more than any drug in the strict sense.
In mild doses produces an initial excitement phase cordial, like alcohol, then sedation and drowsiness. They also generate tolerance and, consequently, addiction, which can cause acute poisoning and even death.
Fentanyl, within the large group of narcotics, has forty times more powerful than heroin and is currently the most widely used in surgery due to its low toxicity to the heart and nervous system
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