Intravenous (IV) Drug Use: Health Risks, Complications, HIV, Hepatitis and Evidence-Based Treatment

Intravenous (IV) drug use, also known as injecting drug use, involves injecting substances directly into a vein using a needle and syringe. While some medications are safely administered by healthcare professionals through intravenous routes, injecting illicit drugs or misusing prescription medications carries significant health risks.

People may inject heroin, morphine, fentanyl, buprenorphine, cocaine, methamphetamine (Ice), crushed prescription tablets, or other substances. Because the drug reaches the bloodstream almost immediately, injection produces rapid effects but also greatly increases the risk of overdose, infections, and long-term medical complications.

Injecting drug use is associated with some of the highest rates of preventable illness and premature death among people with substance use disorders. Fortunately, effective treatment is available, and recovery is possible.

According to the United Nations Office on Drugs and Crime (UNODC) and the World Health Organization (WHO):

These figures highlight the importance of early intervention, harm reduction, and evidence-based addiction treatment.

Substances commonly injected include:

Injecting combinations of drugs or combining opioids with alcohol or sedatives significantly increases the risk of fatal overdose.

Injection bypasses the body’s natural protective barriers and introduces substances directly into the bloodstream.

Potential risks include:

Sharing needles, syringes, or other injecting equipment can transmit Human Immunodeficiency Virus (HIV).

Without treatment, HIV progressively weakens the immune system and increases susceptibility to serious infections and certain cancers.

Modern antiretroviral therapy (ART) has transformed HIV into a manageable chronic condition, and early diagnosis greatly improves long-term outcomes.

People who inject drugs are at increased risk of:

HBV can cause acute or chronic liver disease. Safe and effective vaccination is available.

HCV is one of the most common infections among people who inject drugs. Chronic infection may lead to:

Highly effective direct-acting antiviral medications can cure most cases of Hepatitis C when diagnosed and treated appropriately.

Repeated injections may result in:

Untreated infections can spread into the bloodstream and become life-threatening.

Bacteria introduced during injection may enter the bloodstream, causing sepsis, a medical emergency.

Symptoms include:

Immediate hospital treatment is required.

One of the most serious complications of injecting drug use is infective endocarditis, an infection of the heart valves.

Symptoms may include:

Treatment often requires prolonged intravenous antibiotics and, in some cases, heart valve surgery.

Long-term injecting may cause:

Opioid overdose is a medical emergency.

Warning signs include:

Immediate emergency medical care is essential. Naloxone can reverse opioid overdose when administered promptly by trained individuals or healthcare professionals.

Injecting drug use is commonly associated with:

Integrated psychiatric and addiction treatment improves recovery outcomes.

Effective treatment begins with a detailed evaluation that includes:

Treatment should address both addiction and associated medical complications.

Patients with opioid dependence may require supervised withdrawal management to safely manage symptoms and reduce complications.

For opioid use disorder, international clinical guidelines recommend:

These treatments reduce:

They also improve treatment retention and quality of life.

Evidence-based psychological treatments include:

Harm reduction does not encourage drug use. Instead, it aims to reduce preventable illness and death while supporting access to treatment.

Examples include:

These interventions are supported by major international public health organizations because they reduce transmission of infectious diseases and improve engagement with addiction treatment.

There is no single test that diagnoses a substance use disorder related to injecting. Diagnosis is based on a clinical history of drug use patterns, tolerance, withdrawal, and impaired control, combined with a physical examination for injection-related complications and laboratory testing for blood-borne infections.

Because the medical risks of injecting are so significant, the initial assessment routinely combines a psychiatric evaluation with infectious disease screening, rather than treating addiction and physical health as separate issues.

Long-term recovery includes:

Recovery is a gradual process, and continued support significantly improves long-term success.

Immediate medical attention is required if someone experiences:

These symptoms may indicate overdose, severe infection, stroke, or another life-threatening condition.

Injecting drug use is associated with serious medical and psychiatric complications, but effective treatment can dramatically improve health and quality of life. Early diagnosis, evidence-based medication, psychotherapy, treatment of infections, family support, and long-term follow-up provide the best opportunity for sustained recovery.

Dr. Muhammad Shoaib Zafar is a Consultant Psychiatrist and Addiction Specialist with expertise in the assessment and treatment of opioid and other substance use disorders, including individuals who inject drugs. Comprehensive care may include psychiatric assessment, medically supervised withdrawal, medication-assisted treatment, management of co-occurring mental health conditions, relapse prevention, family counselling, and coordination with infectious disease and medical specialists when required. Patients needing structured inpatient detoxification and rehabilitation may benefit from multidisciplinary treatment at Revive Sobriety Center.

This article is provided for general educational purposes and does not replace professional medical assessment, diagnosis, or treatment. If you or someone you know injects drugs, please seek emergency care for any severe symptoms and consult a qualified healthcare professional for testing and treatment.