Our admissions team is available now, 24/7
Krokodil guide · Symptoms

Krokodil use symptoms and signs of addiction

Reviewed by: Dr. Mahmoud El-Sawy Last updated: October 1, 2026 5 min read
The short answer

Krokodil use symptoms combine signs of opioid use, such as drowsiness, pinpoint pupils, and slow speech and movement, with distinctive signs caused by the toxic substances in the mixture: wounds and ulcers around the injection sites and away from them, discolored, scaly skin, and mouth and jaw problems such as gum inflammation, tooth decay, and jaw pain or swelling. These come with changes in behavior, money, and relationships, and withdrawal symptoms if an injection is late.

  • Not every skin sore is krokodil; any unsterile injecting can cause wounds.
  • A wound that widens or turns black needs a doctor the same day.
  • A calm approach is better than accusation, because stigma delays treatment.

Signs of opioid use

Because krokodil is an opioid, its first signs resemble those of heroin use: drowsiness, heaviness, and withdrawal from surroundings. What sets it apart comes later, on the skin and in the mouth.

  • Drowsiness and nodding off at inappropriate times, and slow speech and movement.
  • Very small pupils.
  • Itching and redness of the skin.
  • Nausea, constipation, loss of appetite, and weight loss.
  • When an injection is late: runny nose, yawning, sweating, chills, aches, and irritability.

Distinctive skin signs

Studies describe skin signs far more severe than doctors usually see in people who inject opioids. What a family may notice includes:

  • Discolored, scaly skin that looks like reptile scales, the sign that gave the drug its name.
  • Open sores around injection sites, and sometimes in places far from them.
  • Inflamed veins that are hardened or painful.
  • Wounds that turn black or give off a foul smell.
  • Hiding the arms and legs under long clothes even in the heat.
  • Frequent bandages without a convincing explanation.

Signs in the mouth and jaw

A systematic review published in 2019 states that jawbone death is the most prominent oral harm of krokodil, and that related signs include changes in the lining of the mouth and a higher risk of tooth decay and gum disease. A family may notice pain or swelling in the jaw or face, loosening teeth, a wound in the mouth that does not heal, or exposed bone in the gum. These signs need a dentist or an oral and maxillofacial surgeon quickly.

Behavioral and psychological signs

  • Used syringes, unfamiliar equipment, or cough medicines and painkillers containing codeine in large quantities.
  • Withdrawing from others and neglecting hygiene, work, and studies.
  • A constant need for money, or items disappearing from the house.
  • Denial or anger when asked about the wounds.

How do you tell krokodil from heroin?

Shared signs and distinctive signs
KrokodilHeroin
FormatLight brown liquid prepared at homePowder that is sniffed, smoked, or injected
Signs of opioid useDrowsiness and pinpoint pupilsDrowsiness and pinpoint pupils
SkinUlcers, discoloration, and peeling that may extend away from the injection siteInjection marks and abscesses mostly at the injection site
Mouth and jawRisk of jawbone deathTooth decay and gum disease with neglect
Infographic: krokodil or heroin?: appearance, signs of opioid use, skin, mouth and jaw
A comparison of the signs of krokodil and heroin use.

Remember that unsterile injecting of any substance can cause wounds and abscesses, and that diagnosis needs a doctor. So do not rely on images circulating online to judge.

When is use an addiction?

Desomorphine is described as highly likely to cause dependence, which is why use quickly becomes a daily pattern. Signs of addiction include needing more injections for the same effect, continuing despite wounds and pain, failing to stop, withdrawal symptoms similar to heroin withdrawal if an injection is late, and the decline of all other interests.

Signs that call for emergency care immediately

Slowed breathing

Shallow or stopped breathing, or no response when called.

A worsening wound

It widens quickly, turns black, or gives off a foul smell.

Fever and chills

With severe pain or swelling in a limb, a sign of infection that may spread into the blood.

Facial swelling

Pain and swelling in the jaw with fever, or exposed bone in the mouth.

How do you talk to someone who uses krokodil?

  1. Start with the wounds and health, not accusation: “I'm worried about your leg, you need to see a doctor.”
  2. Go with them to the doctor to treat the wounds first; this is an acceptable doorway to conversation.
  3. Do not threaten them with the police or being thrown out; fear pushes them to hide it and delay treatment.
  4. Ask for testing for hepatitis viruses and HIV.
  5. Contact an addiction treatment center, and read how to persuade a person with addiction to get treatment.

Treatment is possible: supervised detox, then opioid addiction treatment with medications such as buprenorphine and psychological therapy, alongside surgical and skin treatment.

Danger signs after using krokodil: call an ambulance (123) immediately

  • Slow, shallow, or stopped breathing, or no response when called
  • Pinpoint pupils with blue lips and fingernails and cold skin
  • A wound that is spreading quickly, turning black, or giving off a foul smell
  • Fever and chills with severe pain or swelling in a limb
  • Exposed bone in the mouth, or severe facial swelling with fever

Call an ambulance on 123 immediately. If the person is unconscious but breathing, place them on their side (recovery position) so they do not choke on vomit, stay with them and do not leave them alone, and give them nothing by mouth. Tell the paramedics that they injected a home-made substance and any other substances they used. Infected wounds cannot wait: seek medical care the same day.

Call the ambulance 123
Frequently asked questions

Frequently asked questions about krokodil

Didn’t find your answer?

Ask an advisor directly. The reply is confidential and carries no commitment.

Ask on WhatsApp
What are the symptoms of krokodil use?

Signs of opioid use such as drowsiness and pinpoint pupils, with wounds, ulcers, discolored and scaly skin, mouth and jaw problems, and behavioral changes.

How do I know a wound was caused by krokodil?

It cannot be determined from appearance alone, since any unsterile injecting can cause wounds. But severe, fast-developing ulcers far from the injection sites, and skin discoloration and peeling, call for questions and a medical assessment.

Does krokodil cause dental problems?

Yes, gum disease and tooth decay are linked to it, and more serious is death of the jawbones.

What are the symptoms of krokodil withdrawal?

Opioid withdrawal symptoms similar to heroin withdrawal: runny nose, yawning, sweating, chills, muscle aches, diarrhea, insomnia, irritability, and intense cravings.

Does everyone who uses krokodil develop wounds?

Skin damage is very common in reports because of the toxic substances in the mixture, but its severity and speed vary from person to person.

What should I do if I find out my son uses krokodil?

Start by getting the wounds treated by a doctor right away, talk to him calmly, ask for infection tests, and contact an addiction treatment center without delay.

Need help with krokodil?

Your information is confidential and is not shared with anyone

Call WhatsApp Consultation