Good to know you really never looked into drugs
Cocaine: Leaves of the coca plant (Erythroxylum coca) have been used as a stimulant in South America for thousands of years. The drug derived from coca, cocaine — popularly known as coke, blow or Bolivian marching powder — has been credited with a range of health benefits.
Cocaine can be used as a topical anesthetic for surgical procedures due to its rapid-acting numbing properties. When combined with other compounds into a preparation called TAC, cocaine can also treat minor skin lacerations, since the drug is an effective vasoconstrictor (narrows blood vessels).
Dr. Andrew Weil, founder and director of the Arizona Center for Integrative Medicine, has studied coca's gastrointestinal effects among South American communities. "If you look carefully at the coca leaf's molecular array, you find 14 bioactive alkaloids … while cocaine acts as a gut stimulant, other coca alkaloids can have precisely the opposite action. They inhibit gut activity," Weil wrote in the Huffington Post.
"During my time in Andean Indian communities, I collected many reports about whole coca's paradoxical, normalizing effect on bowel function, and experienced it firsthand, as well," he wrote.
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Heroin, as you may know, is an opiate, a class of drugs commonly used as painkillers (heroin itself is actually much more effective than morphine, working its magic in about two or three minutes). The National Health Service (NHS) in Britain recommends giving it to people in extreme pain, people in surgery and women in labor.
That's right -- the NHS, which is made up of medical professionals who have each read at least one book, gives heroin to pregnant women. The women are given an injection of it to help with the contractions as they blast their progeny out with vagina propulsion. Because the child is on its way out of its mother's body, the one-time use doesn't do any damage and doesn't cause dependency, although the newborns won't stop crying until the doctors put on a Miles Davis record.
As for you, you could get some methadone, but if you really need it, the doctors will just straight up give you heroin for your trouble. You see, some addiction treatment centers give out medical heroin to addicts who don't respond to methadone, with the idea of keeping them safe and off the streets while simultaneously weaning them off of the china white dragon.
Come on now. Pretty clear that we are talking about practical uses. Obviously, every drug CAN have a benefit. And that would be a valid argument if those were practical uses. Child birth is hardly a practical use, at least enough to make it legal. There are much safer forms of opiates and anesthetics that do the exact same job.
How doctors in third world countries use cocaine or other hard drugs for medical purposes is of little relevance, considering there are better alternatives that are still affordable here in America.