Top pick: call America's Poison Centers at 1-800-222-1222 and stay with your friend while you talk. The criteria that decide your next step are consciousness, breathing, severity of vomiting or agitation, the product involved (flower, edible, concentrate, or synthetic cannabinoid), and whether alcohol, opioids, benzodiazepines, or other drugs are in the mix. Cannabis alone rarely causes a fatal overdose, but it can cause severe panic, vomiting, psychosis, and falls, and it becomes more dangerous with other substances or when breathing is affected.

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Call Poison Control First for a Responsive Friend

Poison Control is the top pick for triage when your friend is awake and breathing on their own. A specialist can tell you which symptoms need an ER and which can be watched at home.

emergency treatment for cannabis overdose

  • Pros: free, 24/7, confidential, and staffed by toxicology-trained clinicians; it can prevent an unnecessary ER visit and bill.
  • Cons: phone wait times; the specialist cannot physically assess your friend; you need to describe timing, dose, and other substances.

Use this when: the person is awake, breathing normally, and can talk, even if they are anxious, pale, dizzy, nauseated, or saying they feel too high.

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Call 911 or Go to the ER for Any Red Flag

Skip the phone consult and call 911 if your friend is unresponsive, has slow or shallow breathing, or has any symptom that suggests a serious medical problem. Emergency crews can assess breathing and provide oxygen or monitoring.

emergency treatment for cannabis overdose

  • Pros: immediate help, oxygen, monitoring, and treatment for severe symptoms; the safest choice when breathing or consciousness is affected.
  • Cons: cost, transport, ER wait times, and a stressful experience for the person and for you.

Use this when: any red flag is present, especially breathing problems, unresponsiveness, seizure, chest pain, or severe agitation.

Red Flags That Skip the Phone Call

  • Unresponsive or hard to wake.
  • Slow, shallow, or irregular breathing.
  • Chest pain, seizure, fainting, or a fall with head injury.
  • Severe vomiting, unable to keep fluids, or signs of dehydration such as dizziness, dark urine, or no urination.
  • Severe paranoia, hallucinations, agitation, or talk of self-harm.
  • Child or pet exposure.
  • Suspected synthetic cannabinoid (Spice or K2) or an unknown product.
  • Mixed with alcohol, opioids, benzodiazepines, or other sedatives.
  • Pregnancy.

Monitor at Home Only After a Poison Center Consult

Home monitoring can work for a mild case after a poison specialist says it is safe. The key is a calm space and repeated checks.

  • Pros: familiar surroundings, rest, and no ER bill when the case is mild.
  • Cons: symptoms can escalate, and delayed care is harder to manage at home.

Use this when: the person is awake, breathing normally, has no red flags, and Poison Control has cleared home monitoring.

What to Do While You Wait

  • Stay calm and keep your voice low. Panic can make their anxiety worse.
  • Move them to a quiet room and have them sit upright. Do not let them drive or walk far.
  • Offer small sips of water only if they are alert and not vomiting.
  • Do not give more cannabis, CBD, alcohol, coffee, or energy drinks.
  • Note the time, amount, product name, THC dose if known, and any other substances or medicines.
  • Check breathing and responsiveness every 15 minutes. If they become drowsy but are breathing, place them on their side.
  • Do not leave them alone until symptoms improve or a clinician says it is safe.

What Not to Do

  • Do not induce vomiting unless a poison specialist or clinician tells you to.
  • Do not tell them to sleep it off if they are hard to wake or breathing slowly.
  • Do not give food or drink to someone who is drowsy or unresponsive.
  • Do not use hot showers for severe vomiting without medical advice; burns and dehydration are real risks.
  • Do not assume it is only cannabis if the person also drank alcohol or took other drugs.

Watch for Cannabinoid Hyperemesis Syndrome

Some regular cannabis users develop repeated episodes of severe vomiting, belly pain, and nausea. Hot showers may feel like relief, but they do not replace fluids. Go to the ER if the person cannot keep fluids down, has not urinated, or looks dehydrated.

Aftercare and Lower-Risk Use Next Time

Wait until your friend is fully sober and calm before talking about what happened. Shame tends to shut down the conversation. Focus on practical steps.

  • Keep the Poison Control number 1-800-222-1222 in your phone.
  • If edibles are involved, start low, wait at least 2 hours, and do not redose because nothing happened yet.
  • Check THC content and serving size on legal labels. Store cannabis in the original child-resistant package and lock it up.
  • Avoid mixing cannabis with alcohol, opioids, benzodiazepines, or other sedatives.
  • Follow up with a clinician after fainting, psychosis, a seizure, or repeated vomiting.