Repeated heroin injections into the arms can leave visible track marks, and some users inject between their fingers or toes to avoid obvious marks.

Track Marks from Intravenous Heroin Use

People who inject heroin intravenously, like other intravenous drug abusers, are described as having increased risk for contracting tuberculosis and HIV.

Intravenous Heroin Injection and Infection Risk

A method of drug administration where heroin is injected directly into a vein using a hypodermic needle. The image provided shows this act being performed on an ankle.

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- Pattern of substance use that lasts more than one month but does not meet the criteria for dependence 
- 21.6 million Americans suffer from substance-related disorder in 2013 

Drug/Substance Abuse 

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

Opioid Use Disorder Library

- Substance use disorder
- Chronic and complex neurobiological disease 
- Associated with frequent relapse of taking drugs
- Major public health issue 
- Craving is a main component of OUD and other substance use
disorders

Opioid Use Disorder (OUD)

As a result of drug tolerance, some users of amphetamine would take large doses to experience a "high". From this, these users would develop symptoms of paranoia (auditory hallucinations, bizarre motor behavior, etc), which closely resembled schizophrenic symptoms.

Not only that, but amphetamine worsens symptoms of schizophrenia. Amphetamine is found to promote the release of dopamine and prolong the action of the released transmitter by blocking reuptake.

Drug Abuse as Support of the Dopamine Hypothesis of Antipsychotic Drugs

These are items used to prepare and inject opioids. As depicted in the image, examples include a tourniquet, syringes, cotton balls, a small cooking vessel like a spoon, a condom, sterile water, and an alcohol swab for cleaning the injection site.

Drug Paraphernalia for Intravenous Opioid Use

Data on drug use prevalence reveals distinct patterns across different age demographics, with young adulthood (ages 18-25) representing a peak period for the use of most substances. 

*   **Illicit Drugs:** Use is highest at approximately 22% for the 18-25 age group, compared to 10% for ages 12-17 and 7% for those 26 and older.
*   **Marijuana:** Follows a similar trend, with 18% prevalence in the 18-25 group, 7.5% in the 12-17 group, and 5% in the 26 and older group.
*   **Psychotherapeutics:** Usage peaks at 6% for ages 18-25, with lower rates of 3% for ages 12-17 and 2.5% for those 26 and older.
*   **Hallucinogens and Cocaine:** Use is also highest in the 18-25 age group (approximately 2.5% and 2% respectively) and significantly lower in other age brackets.
*   **Inhalants:** This category is an exception, with the highest prevalence among the youngest group (1% for ages 12-17), which then declines with age.

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