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Drug abuse and addiction have been closely linked with HIV/AIDS since the beginning of the epidemic. Although injection drug use is well known in this regard, the role that non-injection drug abuse plays more generally in the spread of HIV is less recognized.
Injection drug use. People typically associate drug abuse and HIV/AIDS with injection drug use and needle sharing. Injection drug use refers to when a drug is injected into a tissue or vein with a needle. When injection drug users share “equipment”—such as needles, syringes, and other drug injection tools—HIV can be transmitted between users. Other infections—such as hepatitis C—can also be spread this way. Hepatitis C can cause liver disease and permanent liver damage.
Poor judgment and risky behavior. Drug abuse by any method (not just injection) can put a person at risk for contracting HIV. Drug and alcohol intoxication affect the way a person makes decisions and can lead to unsafe sexual practices, which puts them at risk for getting HIV or transmitting it to someone else.
Biological effects of drugs. Drug abuse and addiction can worsen the progression of HIV and its consequences, especially in the brain. For example, research has shown that HIV causes more harm to nerve cells in the brain and greater cognitive damage among people who abuse methamphetamine than among people with HIV who do not abuse drugs. In animal studies, methamphetamine has been shown to increase the amount of HIV in brain cells.
Drug abuse treatment. Since the late 1980s, researchers have found that if you treat drug abuse you can prevent the spread of HIV. When people who have a drug problem enter treatment, they stop or reduce their drug use and related risk behaviors, including drug injection and unsafe sex. Drug treatment programs also serve an important role in getting out good information on HIV/AIDS and related diseases, providing counseling and testing services, and offering referrals for medical and social services.