The most reliable way to spot an overdose is to watch for changes in breathing, consciousness, and skin color. An overdose looks different depending on the substance involved, but nearly all of them share one thing in common: the person can’t respond normally, and their body is shutting down in visible ways. Knowing what to look for can mean the difference between getting help in time and waiting too long.
Signs of an Opioid Overdose
Opioid overdoses are the most common type of fatal overdose, and they follow a recognizable pattern. Opioids work by suppressing the brain’s automatic drive to breathe. In an overdose, that drive slows dramatically or stops entirely. A person overdosing on opioids like heroin, fentanyl, or prescription painkillers will typically have a breathing rate as low as 4 to 6 breaths per minute, compared to the normal 12 to 20. Their breaths may be shallow, irregular, or accompanied by snoring or gurgling sounds.
Other signs to watch for:
- Tiny, pinpoint pupils that don’t change in response to light
- Blue or purple lips and fingernails, a sign that oxygen levels are dropping
- Pale, cold, clammy skin
- Limp body and weak limbs
- Unresponsiveness, meaning you can’t wake the person by shouting or rubbing your knuckles firmly on their breastbone
- Vomiting, which is especially dangerous if the person is unconscious and lying on their back
One critical detail: the snoring or gurgling sound that sometimes comes from an overdosing person is not normal sleep. It often means the airway is partially blocked. People sometimes mistake this for heavy sleeping and walk away. If someone is making those sounds after using drugs and you can’t wake them, treat it as an emergency.
Fentanyl Changes the Timeline
Fentanyl is far more potent than heroin, and overdoses from fentanyl can happen faster, sometimes within minutes of use. This leaves a shorter window to notice something is wrong and act. Because fentanyl is now mixed into many street drugs, including pills sold as prescription medications, an opioid overdose can happen to someone who didn’t know they were taking an opioid at all.
Xylazine, an animal tranquilizer increasingly found in the fentanyl supply, adds another layer. It slows breathing, heart rate, and blood pressure just like opioids do, but naloxone (the overdose reversal medication) does not reverse xylazine’s effects. If someone doesn’t fully wake up after naloxone, xylazine exposure may be part of the reason. Experts still recommend giving naloxone in these situations, because the opioid component is usually what poses the greatest immediate threat to breathing.
Signs of a Stimulant Overdose
Overdoses from stimulants like cocaine, methamphetamine, or prescription amphetamines look very different from opioid overdoses. Instead of slowing the body down, stimulants push it into overdrive. The person’s heart races, their body temperature spikes, and their behavior can become erratic or frightening.
Symptoms of a stimulant overdose include dizziness, tremors, chest pain, excessive sweating, skin flushing, and a pounding or irregular heartbeat. The person may be confused, agitated, paranoid, or hallucinating. Some people become combative or delusional. Their pupils are often visibly dilated, the opposite of the pinpoint pupils seen in opioid overdoses.
At high doses, a stimulant overdose can trigger seizures, dangerously high fever, and stroke. The progression from agitation to seizures to cardiovascular collapse can happen quickly. If someone who has used stimulants develops a high fever, has a seizure, or complains of severe chest pain or a sudden severe headache, those are signs of a life-threatening situation.
Signs of Alcohol Poisoning
Alcohol poisoning is an overdose, even though people rarely call it that. It happens when blood alcohol levels get high enough to suppress the parts of the brain that control breathing, heart rate, and temperature. Fewer than 8 breaths per minute, or gaps of 10 seconds or more between breaths, are specific warning signs.
Other signs include mental confusion or stupor, inability to stay conscious, vomiting, seizures, a slow heart rate, clammy skin, extremely low body temperature, and bluish or pale skin. One of the most dangerous effects is the loss of the gag reflex. A person who has passed out from alcohol can choke to death on their own vomit because their body no longer triggers the reflex that would normally clear the airway.
The risk increases significantly when alcohol is combined with opioids, benzodiazepines, or sleep medications, because all of these substances suppress the same life-support systems in the brain.
How to Tell the Difference Between Sleep and an Overdose
This is the question that matters most in practice. Someone who has used substances and is now “sleeping” may actually be dying. Try to wake them. Call their name loudly. Shake their shoulders. If they don’t respond, rub your knuckles hard against the center of their chest. A person who is simply asleep will react to pain. A person in an overdose often will not.
Listen to their breathing. Normal sleep breathing is steady and quiet. Overdose breathing is slow, irregular, shallow, or absent. Gurgling, choking, or gasping sounds are red flags. A gasping pattern where the person’s face grimaces as if in agony, sometimes called agonal breathing, is a reflex that happens near death. The person is almost certainly unconscious and not actually feeling pain, but it signals that the brain is losing control of basic functions.
Check their skin. Cold, clammy, pale, or blue-tinged skin, especially around the lips and fingertips, indicates that oxygen is not reaching the body’s tissues.
What to Do When You Spot an Overdose
Call 911 immediately. Do not wait to see if the person improves on their own. While you wait for help:
- Give naloxone if available and you suspect opioids. Naloxone nasal spray is sprayed into one nostril while the person is lying on their back. Do not wait for emergency workers to arrive. More than one dose may be needed, especially with fentanyl.
- Turn the person on their side to prevent choking if they vomit.
- If the person is not breathing, give rescue breaths. Pinch their nose closed, seal your mouth over theirs, and give one breath every 5 seconds.
- Try to keep them awake and breathing if they are responsive at all.
- Stay with them until paramedics arrive. Naloxone is temporary, wearing off in 30 to 90 minutes, while the opioid may still be active in their system. A person who seems to recover can slip back into an overdose.
For stimulant overdoses, there is no reversal medication. Keep the person in a cool, quiet space to reduce agitation and overheating. If they are having a seizure, do not restrain them or put anything in their mouth. Move objects away from them and protect their head.
Legal Protections for Calling 911
Fear of arrest stops many people from calling for help. Forty states and Washington, D.C. have passed Good Samaritan laws specifically designed to address this. These laws provide some degree of immunity from drug-related charges for people who call 911 during an overdose, whether they’re a bystander or the person overdosing. The specifics vary by state: some offer full immunity from prosecution, while others offer reduced sentencing. The protections generally apply to possession charges and do not cover unrelated offenses or large-scale distribution.
The core idea behind these laws is simple: getting someone medical help should not result in a criminal charge for the person who made the call.