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Heroin Side Effects: Key Symptoms of Heroin Use

Medical Providers:
Dr. Michael Vines, MD
Alex Spritzer, FNP, CARN-AP, PMHNP
Clinical Providers:
Natalie Foster, LPC-S, MS
Last Updated: September 28, 2025

Heroin is a potent and highly addictive opioid that can impact both the body and mind in serious ways. Recognizing the signs of heroin use is crucial for identifying potential drug abuse and finding the right support.

This guide breaks down the physical and mental symptoms linked to heroin use, helping you understand the risks and consequences involved. Whether you’re looking to educate yourself, protect a loved one, or simply increase awareness, this article offers clear insights into heroin side effects, including common withdrawal symptoms, presented in a straightforward and professional way.

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(Diamorphine) Heroin Side Effects

What Are the Side Effects of Using Heroin?

Using heroin can lead to serious and harmful effects on both the body and mind. Below are the heroin side effects, organized by their potential risks:

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Slowed Breathing

One of the most serious heroin side effects is its potential to cause respiratory failure, which can be fatal.

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Overdose

Using high doses of heroin can trigger a life-threatening overdose, which may cause unconsciousness, coma, or even death.

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Addiction

Heroin is extremely addictive, and repeated use can quickly lead to dependence, making it very difficult to stop.

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Decreased Heart Rate

Heroin can slow the heart rate, placing extra strain on the cardiovascular system and increasing the risk of serious complications.

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Nausea and Vomiting

Heroin use can upset the stomach, often causing nausea and vomiting.

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Drowsiness

People using heroin may feel extremely drowsy, making it hard to stay awake or focus.

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Symptoms of Heroin Use

What Are the Symptoms of Heroin?

The signs and symptoms of heroin use can vary depending on the amount taken. Here are some common indicators that someone may be using heroin:

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Euphoria

Heroin can produce a powerful sense of euphoria and relaxation, often referred to as a “high.”

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Drowsiness

Heroin users may feel extremely drowsy, making it difficult to stay awake or remain alert.

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Constricted Pupils

The pupils may become unusually small, even in low-light conditions.

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Nausea and Vomiting

Heroin use can irritate the stomach, often resulting in nausea and vomiting.

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Itchiness

Heroin users may experience intense itching, often leading to frequent scratching.

icon showing slowed breathing which is a symptom of drug use

Slowed Breathing

One of the most serious heroin side effects is slowed or shallow breathing, which can be life-threatening.

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Mental and Physical Symptoms of Heroin

Mental Symptoms of Heroin Use

Heroin use can take a serious toll on both the body and mind. Recognizing the mental symptoms of heroin use is important for identifying potential signs of addiction. Here are some common mental effects that may appear in people using heroin:

  • Mental Clouding: Heroin can make it hard to think clearly or make sound decisions.
  • Mood Swings: Users may experience sudden emotional shifts, feeling happy one moment and sad or irritable the next.
  • Confusion: Heroin can lead to mental disorientation, making it difficult to process information.
  • Memory Problems: Using heroin may cause forgetfulness and trouble recalling information.
  • Euphoria: Users often feel an intense sense of pleasure and relaxation, commonly described as a “high.”

Physical Symptoms of Heroin Use

Heroin use can impact both the body and mind. Recognizing the physical symptoms of heroin use is important for spotting potential signs of substance abuse. Some common physical effects include:

  • Weight Loss: Heroin use can cause noticeable, unexplained weight loss.
  • Sweating: Users may sweat excessively, even in cool conditions.
  • Constipation: Heroin can make bowel movements difficult or infrequent.
  • Runny Nose: Some people may experience a constantly runny or congested nose, especially during withdrawal.
  • Flushed Skin: The skin may appear red or flushed in certain areas.

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Short and Long Term Side Effects of Heroin

What Are the Short Term Side Effects of Heroin?

Heroin can quickly impact both the body and mind. People may experience intense feelings of relaxation and euphoria, while their pupils become very small. Drowsiness and nausea are common, and some may notice itching or slowed breathing, along with mental confusion.

Heroin can also slow the heart rate, cause constipation, and lead to flushed skin or a runny nose. Even small amounts of heroin carry serious risks and can be extremely harmful to your health.

What Are the Long Term Side Effects of Heroin?

Long-term heroin use can have serious and lasting effects on health. One of the most significant is addiction, where a person becomes highly dependent on the drug. It can also harm vital organs such as the liver and kidneys, cause breathing difficulties, and weaken the immune system. Mental health issues, including depression and anxiety, may develop, along with problems with memory and cognitive function.

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Treating Side Effects of Heroin

If you or a loved one is struggling with heroin addiction or its effects, getting support from addiction specialists is crucial. Arizona IOP, an outpatient addiction treatment center in Scottsdale, Arizona, is dedicated to helping individuals overcome heroin addiction.

They offer personalized treatment plans, including medication-assisted programs, to guide people on their path to recovery. Reach out to Arizona IOP today to speak with a healthcare professional and get the guidance needed to start feeling better.