Heroin Facts: Effects, Addiction & Treatment

heroin, drugs, addiction, narcotics
Heroin is commonly used in powder form. Users heat the heroin on a spoon and inject the resulting liquid.
Credit: Evdokimov Maxim | Shutterstock

Heroin is an opiate drug that's derived from morphine, which is itself obtained from the opium poppy plant (Papaver somniferum). Techniques vary, but most growers use either the seedpods or the straw chaff of the flowering plant to extract a light-brown powder containing concentrated morphine.

Opium poppies and their derivatives — including the painkillers codeine and laudanum, the cough-suppressant noscapine, as well as morphine — have been renowned throughout human history.

Neolithic burial sites in Spain show evidence of poppy use. The first recorded reference to opium comes from 3400 B.C., when the opium poppy was grown in Mesopotamia, according to the Drug Enforcement Agency (DEA). The ancient Sumerians referred to the poppy as hul gil (the "joy plant"), and ancient Egyptian, Greek, Minoan and Sanskrit texts document the use of poppy-derived medicines.

In the early 1800s, the Opium Wars resulted when British merchants attempted to correct a trade imbalance with China by flooding the Asian nation with cheap opium, which resulted in widespread addiction. Chinese officials attempted to halt the trade in opium, but invading British troops forced China to accept open trading policies — including opium imports — with European powers.

The poppy plant grows in mild climates around the world: Afghanistan produces the most opium poppies, but the plant is also cultivated in Mexico, Columbia, Turkey, Pakistan, India, Burma, Thailand, Australia and China.

An accidental discovery

Morphine was first extracted from opium resin in 1803; it quickly gained popularity among doctors as a painkiller, and was used widely in the U.S. Civil War and other conflicts.

In 1898, while using morphine to synthesize codeine — an opiate less potent and less addictive than morphine — chemist Felix Hoffman combined morphine with acetic anhydride and accidentally created heroin (diacetylmorphine), which is several times more potent than morphine.

Hoffman's company, which eventually grew to become the pharmaceutical giant Bayer, marketed diacetylmorphine as "Heroin" based on its supposed heroic qualities. The company promoted its new product as a safer painkiller than morphine, until it was discovered that heroin rapidly metabolizes into morphine in the body.

The United States and most other countries eventually banned heroin; it's now listed under the U.S. Controlled Substances Act as a Schedule I narcotic, which means it's considered to have no medical benefit and a high potential for abuse.

How heroin works

Heroin is available in several different forms — the most common are a powder that ranges in color from brown to white, and a sticky, dense resin known as "black tar." Known by street names including "horse" and "smack," heroin is often cut with substances such as powdered milk, sugar, starch, quinine or other impurities, according to the U.S. Department of Justice.

In powder form, heroin can be inhaled, "snorted" into the nostrils or smoked; users can also insert it into the anus or vagina. Many, however, prefer to inject a liquid form of the drug (after it's combined with water and an acid such as lemon juice); this method results in a faster, more-intense high.

Like other opioid-based painkillers, heroin binds to opioid receptors in the brain and spinal cord. This results an intense "rush" of euphoria — especially when the drug is injected — and freedom from pain and anxiety, followed by a warming sensation and the drowsy sense of well-being typical of opioid painkillers. This high can last for several hours, depending on the strength of the dose.

Poppy plants are harvested to produce morphine, which in turn yields heroin.
Credit: berna namoglu /

Side effects of heroin

In addition to impaired mental functioning from the high it causes, heroin often leads to physical dependence among users. The drug also causes constricted pupils, nausea, constipation, muscle spasms, and a slowed pulse and rate of breathing.

In high doses, heroin can result in convulsions and a dangerously low pulse. The drug's depressive effect on respiration can cause slow, shallow breathing that may, in the case of an overdose, stop altogether — the cessation of breathing is a leading cause of death among heroin users.

Injection of heroin — particularly with shared needles — has also been associated with the spread of blood-borne pathogens, including hepatitis and HIV/AIDS.

Additionally, heroin can be cut with any number of toxic impurities, including fentanyl, another opioid painkiller that can greatly increase the potency of heroin.

Treatment for heroin use

Heroin has been rising in popularity in recent years. An estimated 607,000 people used heroin each year from 2009 to 2011, compared to 374,000 people each year from 2002 to 2005, according to the U.S. Substance Abuse and Mental Health Services Administration (SAMSHA).

Additionally, the estimated average number of new users jumped from 109,000 per year from 2002 to 2005 up to 169,000 each year from 2009 to 2011, according to SAMSHA. 

Treatment for heroin addiction often includes behavioral counseling and medical therapies, including the regulated use of methadone or buprenorphine, both synthetic opioids that have varying degrees of success at treating opioid addictions.

Withdrawal from heroin use can be a difficult and lengthy process — symptoms can include extreme pain, insomnia, nausea, vomiting and diarrhea.

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Marc Lallanilla, LiveScience Staff Writer

Marc Lallanilla

Marc Lallanilla has been a science writer and health editor at and a producer with His freelance writing has appeared in the Los Angeles Times and Marc has a Master's degree in environmental planning from the University of California, Berkeley, and an undergraduate degree from the University of Texas at Austin.
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