The key signs of a drug overdose, including unresponsiveness, slow or stopped breathing, blue or pale skin, gurgling sounds, and loss of consciousness, are medical emergencies that require an immediate 911 call. More than 105,000 people in the United States died from a drug-involved overdose in 2023. CDC provisional data then recorded a decline of roughly 27% across 2024, with opioid-involved deaths falling from an estimated 83,140 to 54,743. Overdose deaths still run into the tens of thousands each year, and many of them are preventable when bystanders know what to look for and how to act.
Overdoses happen to anyone: someone misusing substances, a patient taking a prescribed medication incorrectly, or a person who unknowingly consumed a drug laced with fentanyl. The specific signs differ depending on whether the substance is an opioid, stimulant, alcohol, or sedative, and knowing that difference changes what you do in the next two minutes.
Highlights
- The key signs of a drug overdose include unresponsiveness, slow or stopped breathing, blue or pale skin, gurgling sounds, and loss of consciousness
- Opioid overdoses are the most common overdose emergency in the U.S. and can be reversed with naloxone (Narcan) if administered quickly
- Call 911 immediately if you suspect an overdose; do not wait for symptoms to worsen
- Most states have Good Samaritan laws protecting people who call for emergency help during an overdose
- Never induce vomiting, place someone in a cold shower, or leave them alone during an overdose
- Overdose is a medical emergency; survival depends on how fast help arrives
What Signs Indicate a Potential Drug Overdose?
Unresponsiveness, slow or stopped breathing, blue or grey lips and fingertips, gurgling or snoring sounds, and limpness together indicate an overdose and a medical emergency.
There are 10 widely recognized signs that indicate a potential drug overdose:
- Unresponsiveness or loss of consciousness
- Slow, shallow, or stopped breathing
- Blue, grey, or pale skin, particularly around the lips and fingertips
- Gurgling, choking, or unusual snoring sounds
- Limpness in the arms and legs
- Pinpoint (very small) or extremely dilated pupils
- Seizures
- Vomiting while unconscious
- Confusion, severe agitation, or psychosis
- Chest pain or racing heartbeat
Not all of these signs appear in every overdose. The specific pattern depends on the substance involved. Any combination of unresponsiveness, abnormal breathing, and skin color changes is a medical emergency requiring immediate 911 contact.
What Does an Overdose Look Like?
An overdose looks dramatically different depending on whether the substance is a depressant (opioids, alcohol, benzodiazepines) or a stimulant (cocaine, meth, MDMA).
A depressant overdose looks like deep unconsciousness, the person appears to be sleeping but cannot be woken, breathes very slowly or stops breathing entirely, with a gurgling or rattling sound. Lips and fingertips turn blue. The body goes completely limp.
A stimulant overdose looks the opposite; the person is conscious but extremely agitated, confused, or psychotic. The heart races, the skin is flushed and sweaty, and a seizure follows. Chest pain, paranoia and hallucinations accompany it.
Key difference: A depressant overdose kills by stopping breathing. A stimulant overdose kills by overwhelming the heart and cardiovascular system. Recognizing which type of overdose is occurring helps you describe symptoms accurately to emergency dispatchers.
What Does an Overdose Feel Like?
An opioid overdose brings warmth, then heaviness and unconsciousness, with no pain and no memory of it, while a stimulant overdose brings a racing heart, chest pain and panic that the person stays awake through.
From accounts of people who have survived overdoses, the experience varies significantly by substance as follows:
In an opioid overdose, the person feels an initial rush of warmth and sedation, followed rapidly by extreme heaviness, an inability to stay awake, and then loss of consciousness. Overdose survivors describe not feeling pain and being completely unaware of what is happening to their body. Breathing slows without the person realizing it.
In a stimulant overdose, the experience is more often terrifying, with a racing heart that feels out of control, overwhelming anxiety or panic, chest pain, and vivid paranoia or hallucinations. The person is aware that something is very wrong.
In an alcohol overdose (alcohol poisoning), the person feels intensely nauseated and confused before losing consciousness. The dangerous stage arrives when they can no longer stay awake to protect their airway.
Does Overdosing Hurt?
In most opioid overdoses, the person feels little to no pain. Opioids are powerful pain suppressors, and the loss of consciousness that accompanies an opioid overdose happens before physical distress registers. Many overdose survivors report no memory of the event.
Stimulant overdoses are painful and frightening. Chest pain from cardiac strain, severe headache, and the psychological terror of paranoia or hallucinations are reported. Stimulant overdoses involve a conscious experience of physical distress.
Alcohol and sedative overdoses occupy a middle ground; the person experiences significant nausea and disorientation before losing consciousness, but the loss of awareness occurs before the most life-threatening phase.
Can You Overdose in Your Sleep?
Yes. Opioid overdoses in particular occur during sleep or while the person is nodding off. Because opioids cause extreme sedation and suppress the brain’s drive to breathe, a person stops breathing while asleep without waking.
There are 5 warning signs of an overdose occurring during sleep:
- Unusual or unfamiliar snoring or gurgling sounds
- Breathing that sounds slow, irregular, or labored
- Inability to wake the person with voice or a gentle touch
- Blue or pale skin color around the lips
- Complete limpness when touched
Where someone is making unfamiliar noises while sleeping, try to wake them immediately. Call their name loudly, shake their shoulder firmly. Call 911 and begin overdose response procedures where they do not respond. Do not assume they are sleeping deeply.
What Are the Signs of Overdose by Substance?
Different substances act on the body in distinct ways. Understanding which signs correspond to which substances helps emergency responders recognize them and treat them appropriately.
Opioid Overdose Signs
Opioids, including heroin, fentanyl, oxycodone, hydrocodone, morphine, codeine, and methadone, suppress the central nervous system and remove the body’s natural drive to breathe.
There are 7 key signs of opioid overdose:
- No response to voice or physical stimulation
- Slow, shallow, or completely stopped breathing
- Blue or grey lips, fingertips, or skin
- Gurgling, rattling, or unusual snoring sounds
- Floppy, limp arms and legs
- Pinpoint (extremely small) pupils
- Loss of consciousness
Opioid overdose is the most reversible type of overdose when naloxone is available. Every minute without breathing causes brain damage; the speed of response is critical.
Alcohol Overdose Signs (Alcohol Poisoning)
Alcohol is a central nervous system depressant. In high doses, it progressively shuts down the brain’s control of basic functions, including breathing and heart rate.
There are 7 key signs of alcohol overdose:
- Confusion, stupor, or unresponsiveness
- Vomiting (especially while unconscious, high choking risk)
- Slow or irregular breathing, fewer than 8 breaths per minute, or a gap of more than 10 seconds between breaths
- Blue-tinged or pale skin
- Seizures
- Very low body temperature (hypothermia), cold, clammy skin
- Loss of consciousness that cannot be reversed
A person cannot simply “sleep off” alcohol poisoning. Blood alcohol levels continue to rise after drinking stops, and a person who is unconscious reaches lethal levels while asleep.
Benzodiazepine and Sedative Overdose Signs
Benzodiazepines (Xanax, Valium, Klonopin, Ativan) and barbiturates cause respiratory suppression similar to opioids, particularly when combined with alcohol or opioids.
There are 7 key signs of benzodiazepine overdose:
- Extreme drowsiness or unresponsiveness
- Slurred speech
- Shallow or slowed breathing
- Blue nails or lips
- Confusion or disorientation
- Limp body
- Loss of consciousness
Benzodiazepine overdose is especially dangerous in combination with opioids or alcohol because combined depressants compound respiratory suppression. Many fentanyl overdose deaths also involve benzodiazepines.
Stimulant Overdose Signs (Cocaine, Methamphetamine, MDMA)
Stimulants accelerate the nervous system and cardiovascular function. An overdose occurs when the body’s systems become dangerously overstimulated.
There are 7 physical signs:
- Flushed, hot, or sweaty skin
- Chest pain or tightness
- Rapid or irregular heartbeat
- Severe headache
- Rigid muscles, tremors, or seizures
- Difficulty breathing
- High body temperature (hyperthermia)
There are 4 psychological signs:
- Severe agitation, panic, or terror
- Paranoia or hallucinations
- Disorientation and confusion
- Extreme, uncontrollable anxiety
Stimulant overdose carries a high risk of stroke, heart attack, and hyperthermia. The person is conscious during the early stages, which creates a window for them to call for help themselves.
Methamphetamine Overdose Signs
Methamphetamine produces cardiac and neurological emergencies even in people with prior meth use.
There are 5 physical signs:
- Sweaty, overheated skin
- Chest pain or palpitations
- Unsteady movement, spasms, or tremors
- Seizures
- Difficulty breathing
There are 3 psychological signs:
- Intense paranoia
- Severe anxiety or agitation
- Confusion and disorganization
Fentanyl Overdose Signs
Fentanyl is 50-100 times more potent than morphine. Overdose occurs within minutes of exposure, and the signs are identical to other opioid overdoses but progresses faster and requires more than one naloxone dose.
There are 6 key signs of fentanyl overdose:
- Sudden loss of consciousness
- Stopped or severely slowed breathing
- Blue or grey skin, lips, or fingernails
- Gurgling or choking sounds
- Unresponsive to voice or touch
- Rigid “wooden chest” sensation (particularly with high-dose fentanyl) interferes with rescue breathing.
Because illicitly manufactured fentanyl is increasingly found in counterfeit pills and street drugs not marketed as opioids, treat any suspected overdose as a potential fentanyl overdose and administer naloxone.
Novel Psychoactive Substances (NPS) Overdose Signs
Synthetic drugs, including synthetic cannabinoids (K2/Spice), synthetic cathinones (bath salts), and novel opioids, are designed to mimic the effects of cannabis, stimulants, or opioids but behave unpredictably.
There are 5 physical signs:
- Rigid or spasming muscles
- Shaking, nausea, vomiting
- Stopped or severely irregular breathing
- Seizures
- Inability to wake the person
There are 3 psychological signs:
- Extreme distress, paranoia, or confusion
- Aggression or panic
- Disorientation
NPS overdoses are challenging because standard antidotes like naloxone do not work if the substance does not act on opioid receptors. Emergency medical care is essential.
What Should You Do If Someone Is Overdosing?
Speed is the single most important factor in overdose survival. Every minute without breathing damages the brain.
Follow these 5 steps in order:
- Step 1: Try to rouse the person. Call their name loudly. Rub your knuckles firmly on their sternum (breastbone). If they do not respond, they need emergency help immediately.
- Step 2: Call 911. Do not wait to see if symptoms improve. Tell the dispatcher: “I think someone is overdosing. They are not breathing normally / not responding.” Most states have Good Samaritan laws protecting callers from drug-related prosecution when seeking overdose emergency help, so call without hesitation.
- Step 3: Administer naloxone (Narcan) if available. If the overdose appears to be opioid-related (slow breathing, blue lips, unresponsive, gurgling sounds), administer naloxone immediately. Naloxone is available without a prescription at most pharmacies. It reverses an opioid overdose temporarily. If there is no response within 2-3 minutes, give a second dose. Continue rescue breathing if trained to do so. Naloxone does not harm someone who has not taken opioids, so administer it if there is any doubt.
- Step 4: Place them in the recovery position. If the person is unconscious but breathing, roll them onto their side (recovery position) with their head tilted back slightly to keep the airway clear and prevent choking on vomit. Never leave an unconscious person on their back.
- Step 5: Stay and follow the dispatcher’s instructions. Remain with the person until emergency services arrive. Follow any instructions from the 911 dispatcher. If the person stops breathing and you are trained in CPR, begin chest compressions.
What NOT to Do During an Overdose
Avoid all 6 of the following:
- Do not leave the person alone. An unconscious person stops breathing without warning. Time is the critical factor.
- Do not put them in a cold shower or bath. This is a dangerous myth. Cold water produces shock, hypothermia, or drowning in a person who is unconscious or has impaired reflexes.
- Do not try to make them vomit. Inducing vomiting in an unconscious person is extremely dangerous; they aspirate vomit into their lungs, causing suffocation or fatal aspiration pneumonia. It is also ineffective once the substance has been absorbed.
- Do not give them coffee or food. Caffeine does not counteract depressant overdose and complicates the cardiac effects of a stimulant overdose.
- Do not slap, shake, or hit them aggressively. Stimulation strong enough to cause injury is dangerous and does not rouse someone in an opioid overdose. A firm sternum rub is sufficient to assess responsiveness.
- Do not assume they will sleep it off. Drug blood levels continue rising after the last dose. Someone who is merely drowsy becomes unconscious within minutes.
What Is Naloxone (Narcan) and How Does It Work?
Naloxone is a fast-acting medication that blocks opioid receptors and reverses opioid overdose within 2-5 minutes. Naloxone is safe, effective, and available without a prescription at most pharmacies in the United States.
There are 3 forms of naloxone:
- Nasal spray (Narcan, Kloxxado): Insert into one nostril and press the plunger. It is the most common and easiest to use in an emergency.
- Higher-dose nasal spray (Kloxxado, 8 mg): Used the same way as Narcan, in a single nostril. The Evzio auto-injector, which some older guidance still lists, was discontinued in 2020 and is no longer marketed.
- Injectable: Requires training, and used by emergency medical personnel.
How long does naloxone last?
Naloxone wears off in 30-90 minutes, which is shorter than most opioids. That means the person returns to overdose after naloxone wears off. Always call 911, even if naloxone appears to work; the person needs medical monitoring.
Does naloxone work on non-opioid overdoses?
No. Naloxone specifically blocks opioid receptors and has no effect on stimulant, alcohol, or benzodiazepine overdoses. Because fentanyl contamination is now found in many street drugs not sold as opioids, administering naloxone when the substance is unknown is always appropriate.
What to Do After an Overdose
Surviving an overdose is not the end of the situation. That moment is the beginning of a critical decision point.
There are 3 steps immediately after emergency care:
- The person needs medical evaluation for organ damage, particularly to the brain, heart, and liver
- Blood oxygen deprivation during the overdose produces neurological effects
- Co-occurring conditions (cardiac events, aspiration pneumonia, injury from a fall) require assessment
There are 3 steps in the days following:
- Tolerance to opioids drops significantly during hospitalization or abstinence. Returning to the same dose that caused the overdose carries a high risk of death.
- An overdose is a clear indication that the current situation is not sustainable and that the risk of a fatal overdose is high.
- This moment, though frightening, is a window of opportunity for treatment, and acting on it promptly matters.
The period immediately following an overdose is widely treated in clinical practice as a window when people are more receptive to treatment, which is why emergency departments increasingly begin medication and referral before discharge. Connecting with a treatment program within days, not weeks, of an overdose capitalizes on this window and dramatically improves outcomes.
Can You Overdose on Prescription Medications?
Yes. Prescription drugs are among the most common substances involved in overdose deaths. Opioid pain medications (oxycodone, hydrocodone, morphine, fentanyl patches), benzodiazepines (Xanax, Valium, Klonopin), and antidepressants and heart medications all produce fatal overdose when taken in excess or combined with other substances.
There are 4 particularly dangerous combinations:
- Opioids + alcohol
- Opioids + benzodiazepines
- Opioids + muscle relaxants (cyclobenzaprine/Flexeril)
- Any combination of CNS depressants
Never combine prescription drugs with alcohol or other substances without explicit medical guidance.
How Do Good Samaritan Laws Protect You?
Good Samaritan laws give legal immunity from drug possession charges to anyone who calls 911 to report an overdose. Fear of legal consequences stops people calling 911 during an overdose, and Good Samaritan laws exist specifically to remove that barrier.
As of 2025, most U.S. states have some form of Good Samaritan protection that provides legal immunity from drug possession charges to people who call 911 to report an overdose. The exact protections vary by state, but the principle is consistent: calling for help is legally protected.
Do not let fear of arrest prevent you from calling 911. The laws exist because lawmakers recognize that the alternative, people dying because no one called, is far worse than the drug possession issues involved. Your call saves a life.
After Emergency Care
Once emergency care has stabilized the individual, the question becomes: what happens next? An overdose is a serious warning. Without treatment, the risk of another fatal overdose is high.
Riverside Recovery of Tampa offers medically supervised detox as the first step, helping individuals withdraw from substances safely in a controlled environment. Our comprehensive addiction treatment programs are tailored to each individual’s clinical needs and personal circumstances.
FAQ: Drug Overdose Signs and Response
Which of the following may indicate a potential drug overdose?
Key signs of a potential drug overdose include unresponsiveness or unconsciousness and slow or stopped breathing. Further signs are blue or grey lips or fingertips, and unusual gurgling or snoring sounds, limp or floppy body, pinpoint or very large pupils, and seizures. Any one of these signs in someone who has taken drugs or alcohol is grounds for immediately calling 911.
What should you do if someone is showing signs of an overdose?
Call 911 immediately. While waiting for help: try to wake the person, administer naloxone (Narcan) if available and an opioid overdose is suspected, place them on their side in the recovery position if unconscious, and stay with them. Do not leave the person alone, do not induce vomiting, and do not put them in a cold shower.
What are the first signs of an overdose?
Early overdose signs vary by substance. For opioids: increasing unresponsiveness, very slow breathing, and blue-tinged lips. For stimulants: racing heart, chest pain, and severe agitation. For alcohol: profound confusion, vomiting, and inability to stay awake. Any of these early signs warrants immediate concern and preparation to call 911.
What is the first step if someone is making unfamiliar noises while sleeping?
Try to wake them immediately, call their name loudly and firmly shake their shoulder. Unfamiliar gurgling, snoring, or choking sounds during sleep are a potential sign of opioid or depressant overdose. Call 911 immediately and begin overdose response steps where they do not respond to your attempts to wake them.
Can you use Narcan for an alcohol overdose?
No. Naloxone (Narcan) only works on opioid receptors and has no effect on alcohol overdose or alcohol poisoning. Where the overdose involves both opioids and alcohol, which is common, give naloxone for the opioid component while 911 is called for the alcohol component.
What are the opioid overdose steps?
There are 7 opioid overdose response steps:
- Try to rouse the person.
- Call 911.
- Administer naloxone into one nostril if available.
- Perform rescue breathing if trained, and they are not breathing.
- Place them in the recovery position on their side if breathing.
- Administer a second dose of naloxone after 2-3 minutes if no response.
- Stay with the person until emergency services arrive.
References
- Centers for Disease Control and Prevention. Drug Overdose Deaths in the United States, 2023. Atlanta, GA: CDC National Center for Health Statistics; 2024. Available from: https://www.cdc.gov/drugoverdose
- Substance Abuse and Mental Health Services Administration. Opioid Overdose Prevention Toolkit. Rockville, MD: SAMHSA; Updated 2023. Available from: https://store.samhsa.gov/product/opioid-overdose-prevention-toolkit
- U.S. Food and Drug Administration. Naloxone DrugFacts: Information for Patients. Silver Spring, MD: FDA; Updated 2023. Available from: https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/information-about-naloxone-and-nalmefene
- National Institute on Drug Abuse. Opioid Overdose Reversal with Naloxone. Bethesda, MD: NIDA; Updated 2023. Available from: https://nida.nih.gov/publications/drugfacts/naloxone
- Hawk KF, Vaca FE, D’Onofrio G. Reducing Fatal Opioid Overdose: Prevention, Treatment and Harm Reduction Strategies. Yale J Biol Med. 2015 Sep 3;88(3):235-45. PMID: 26339207; PMCID: PMC4553643.
- Davis CS, Carr D. Legal changes to increase access to naloxone for opioid overdose reversal in the United States. Drug Alcohol Depend. 2015 Mar 1;148:1-6. doi: 10.1016/j.drugalcdep.2014.12.013. PMID: 25595653.