If this is an emergency, stop reading and act.
Call 911 for chest pain, difficulty breathing, seizure, unresponsiveness, or if someone cannot be woken.
Call Poison Control at 1-800-222-1222 — free, confidential, 24/7 — or use webpoisoncontrol.org. If a child has eaten a cannabis product, call immediately, even if they seem fine.
Most people who search this are having a bad night, not a medical emergency. That distinction matters, and this article covers both: what an unpleasant-but-ordinary overconsumption looks like, and the specific signs that mean something else is going on.
If you are in it right now, the short version: you are very likely going to be fine, this will pass, and the worst of it is usually over within a few hours. Then read the rest when you can.
This article is for general educational purposes and is not medical advice. If you are worried about yourself or someone else, call Poison Control or seek medical care — that is what they are there for.
Why this happens with edibles specifically
Nearly every overconsumption story starts the same way.
Inhaled THC works within minutes, so you can feel your way to a dose. Edibles do not. THC taken by mouth passes through the digestive system and the liver before reaching your bloodstream, which takes time — typically 30 minutes to two hours, sometimes longer on a full stomach.
So someone takes a gummy, feels nothing after 45 minutes, assumes it is weak, and takes another. Both doses then arrive together. We wrote about the timing in detail in our guide to how long THC gummies last, and about starting doses in our first-timer dosing guide.
The other common route is potency. Products labelled "extra strength" now routinely carry 25 mg or more per piece, and blends adding THCP or HHC can feel considerably stronger than the milligram number suggests. A piece that looks like an ordinary gummy is not an ordinary dose.
What it typically feels like
Uncomfortable, and often frightening — particularly the racing heart and the anxiety, which feed each other. Common effects include:
- Intense anxiety, panic, or a sense of dread
- Paranoid thinking
- A racing or pounding heartbeat
- Nausea and vomiting
- Dizziness, unsteadiness, poor coordination
- Confusion, disorientation, difficulty tracking conversation
- A distorted sense of time — minutes feeling like much longer
- Sedation, sometimes to the point of being difficult to rouse
The anxiety is often the hardest part, because it is self-reinforcing. Your heart races, you notice it racing, that frightens you, and your heart races more. Recognising that loop is genuinely useful: the physical sensation is uncomfortable but not, in itself, dangerous in an otherwise healthy adult.
How long it lasts
For an oral dose, effects usually peak around two to four hours and fade over four to twelve hours, occasionally longer with very large doses. Inhaled effects resolve much faster, generally within two to four hours.
Many people also feel foggy, tired or slightly off the following day. That passes.
The important thing to hold onto is that this has an endpoint. It does not keep escalating indefinitely. If you took it two hours ago, you are probably at or near the worst of it.
What actually helps
Get somewhere you feel safe. Quiet, dim, familiar. Overstimulation makes anxiety worse, and a crowded or loud environment is the wrong place to be.
Sit or lie down. Coordination and balance are impaired even when you feel capable. Falls are one of the more common ways an unpleasant night becomes an injury.
Slow your breathing. Longer out-breaths than in-breaths — in for four, out for six, repeated. This is not folk advice; slowing the breath reduces the physical arousal driving the panic.
Tell someone. Having a calm person present is one of the most effective things available. You do not need them to do anything except be there.
Sip water. Especially if you have been vomiting.
Use distraction. Something familiar and undemanding — a show you have seen before, music you know well. Not something that requires you to follow a plot.
Sleep if you can. It is the most reliable way through, and it is safe to sleep it off provided the person can be roused normally.
Let time pass. This is the one that actually works. Everything else is comfort while it does.
What does not help
Alcohol. Combining them tends to intensify effects and worsen nausea and dizziness. This is the single most common thing that turns a bad night into a worse one.
More cannabis of any kind. Including CBD. You may see the claim that CBD counteracts THC; the evidence is mixed and inconsistent, and it is not a reliable rescue. Adding an unknown to an unpleasant situation is not a good bet.
Caffeine. Increases heart rate and anxiety, which are already the problem.
Driving. Do not drive, and do not let anyone else who has taken it drive. Impairment lasts well beyond the point where people feel capable, and this is how overconsumption harms other people.
Cold showers, ice, or anything designed to shock the system. These do not clear THC and add a fall risk when your coordination is already impaired.
When to get help
Being uncomfortable is not an emergency. These are.
Call 911 for:
- Chest pain or pressure
- Difficulty breathing
- A seizure
- Loss of consciousness, or someone who cannot be woken
- Severe confusion, or a break from reality that is escalating rather than easing
- Vomiting that will not stop, especially with signs of dehydration
Call Poison Control at 1-800-222-1222 for:
- Any ingestion by a child — immediately, whether or not they seem affected
- Ingestion by someone with a heart condition, or anyone taking other medications
- A dose far beyond what was intended
- Any situation where you are unsure — that is precisely what the service is for
Two things worth saying plainly. First, you are not going to be in trouble for calling. Poison Control is a medical service, it is free and confidential, and staff are used to exactly these calls. Second, hesitating because you are embarrassed is how a manageable situation becomes a serious one.
Children: a genuine emergency, every time
This section is different from the rest of the article, because the risk profile is different.
Poison Control advises calling immediately if a child has eaten a cannabis product, whether or not symptoms have appeared — because with edibles, symptoms may not show up straight away.
Children who ingest cannabis edibles can experience vomiting, dizziness, difficulty walking, rapid heart rate, drowsiness and confusion. Severe cases can involve hallucinations, an abnormally slow heart rate and low blood pressure, and may require respiratory support. Poison Control notes that children under 10 are more likely to require hospital admission and respiratory support.
The reason this keeps happening is packaging. Products are made to look like sweets, and are frequently designed to resemble familiar snack brands. A four-year-old cannot read a warning label, and would not distinguish a THC gummy from any other gummy.
Store everything in a locked box or a high cabinet, in original child-resistant packaging, and never in the kitchen alongside ordinary food. The same applies to pets — dogs are frequent accidental consumers, and a vet should be called immediately if it happens.
If this keeps happening: cannabinoid hyperemesis syndrome
One pattern is worth naming, because people often spend a long time misdiagnosing it themselves.
Cannabinoid hyperemesis syndrome involves repeated episodes of severe nausea, vomiting and abdominal pain in long-term, frequent cannabis users. A distinctive feature is that hot showers or baths bring temporary relief. It is often mistaken for a stomach virus or food poisoning, sometimes for years, and it can lead to dehydration serious enough to require treatment.
Counter-intuitively, more cannabis makes it worse rather than better. The condition resolves on stopping. If this describes you, it is worth raising with a doctor — and worth being straightforward with them about cannabis use, because that is the piece of information that makes the diagnosis obvious.
Not repeating it
Wait two full hours before considering more. Set a timer. This one rule prevents most cases.
Start at 2.5 mg if you are new, or returning after a break. Tolerance drops faster than people expect.
Read the package, not the piece. One gummy might be one dose or four. Check milligrams per piece, not per package.
Watch the blends. Products combining delta-8, delta-9, THCP and HHC can feel much stronger than the total milligram figure implies. THCP in particular is far more potent by weight than delta-9 and has very little safety research behind it.
Do not mix with alcohol, especially while you are still learning your dose.
Cut edibles. A 25 mg gummy quartered is roughly 6 mg. Nothing stops you.
The Bottom Line
Overconsumption is unpleasant and frightening, and for a healthy adult it is usually something you get through rather than something that harms you. Find somewhere safe, slow your breathing, tell someone, and wait it out.
But know the exceptions. Chest pain, breathing trouble, seizures and unresponsiveness need 911. Any ingestion by a child needs Poison Control immediately. Those calls are free, they are confidential, and nobody will judge you for making one.
Frequently Asked Questions
Can you die from taking too much THC?
There is no established lethal dose of THC for adults, and deaths from THC alone are not documented in the way they are for many other substances. That does not make overconsumption harmless: it can cause severe distress, dangerous impairment, falls, and serious complications for children and for people with heart conditions. Seek help for any of the emergency signs listed above.
How long will it last?
An oral dose typically peaks at two to four hours and fades over four to twelve hours. Inhaled effects usually resolve within two to four hours. Feeling foggy the next day is common.
Does CBD cancel out THC?
The evidence is mixed and inconsistent, and CBD should not be relied on as a rescue. Adding another substance while you are already uncomfortable is not a good idea.
Should I make myself vomit?
No. Do not induce vomiting. If the dose was taken more than a short time ago it will already have been absorbed, and inducing vomiting carries its own risks. Call Poison Control for guidance instead.
My child ate a THC gummy. What do I do?
Call Poison Control at 1-800-222-1222 immediately, or use webpoisoncontrol.org, even if the child seems fine — symptoms with edibles may be delayed. Call 911 if the child is unresponsive, having difficulty breathing, or having a seizure.
