You Might Not Overdose on Cannabis, But You Can Still Overdo It

Here are some examples of THC toxicity that have been published:

Can You Overdose on Marijuana?

Rod Brouhard is an emergency medical technician paramedic (EMT-P), journalist, educator, and advocate for emergency medical service providers and patients.

Medically reviewed

Verywell Mind articles are reviewed by board-certified physicians and mental healthcare professionals. Medical Reviewers confirm the content is thorough and accurate, reflecting the latest evidence-based research. Content is reviewed before publication and upon substantial updates. Learn more.

Steven Gans, MD is board-certified in psychiatry and is an active supervisor, teacher, and mentor at Massachusetts General Hospital.

Once you do get to see the doctor, don’t be surprised if you’re rushed out of the exam room before you get all of your questions answered, according to healthcare staffing agency Staff Care. Studies show that 41% of ophthalmologists spend just 9 to 12 minutes with a patient, and 13- to 16-minute appointments are the norm for 40% of cardiologists, 37% of pediatricians, 35% of urologists, 35% of family physicians, 34% of obstetricians and gynecologists and 30% of otolaryngologists.

Table of Contents
Table of Contents

Though marijuana overdose is rare, it is possible to take too much of the drug and experience adverse reactions that require hospitalization. However, the effects of a marijuana overdose are usually less detrimental than the effects of overdosing on other commonly misused drugs, such as opioids.

Risks of Marijuana Overdose

The potential risks of using too much marijuana include:

• Anxiety or panic attacks
• Heart arrhythmia (irregular heartbeat)
• Nausea or vomiting
• Paranoia or psychosis

Learn more about the negative health effects linked with overdosing on marijuana.

THC Overdose

Marijuana (also often called weed or cannabis) doesn’t come with a clear definition of overdose. Doctors aren’t entirely sure how much tetrahydrocannabinol (THC) it takes to overdose. THC is the ingredient in marijuana most likely to induce the high that some people are seeking.

THC is the psychoactive ingredient found in marijuana. When someone experiences a marijuana overdose, it is technically a THC overdose. THC causes symptoms like anxiety, paranoia, psychosis, and in some cases, hallucinations.

A toxic level of THC, or an amount that causes severe effects, is generally considered 7.5mg or more.

Risk of Death

Some wonder if marijuana overdose can cause death. There have been a few isolated case reports where marijuana has been implicated in a death.

However, a clear causal relationship has not been established. Medical professionals aren’t sure whether those cases had other contributing factors (like pre-existing cardiac conditions).

Other Adverse Effects

Marijuana is a strange drug in that it contains a lot of active ingredients. Although scientists cite different numbers, in addition to THC, there are thought to be over 100 other cannabinoids in cannabis. Not all of these act the same way.

Get too much THC and you may have a psychoactive reaction that is not unlike that of a stimulant. Cannabidiol (CBD) is associated more with sedative effects.

The effects of marijuana use can vary widely. There have been cases of heart arrhythmias and sudden cardiac arrest while smoking weed. There are reports of both seizures and the reduction of seizures, which seems to be based on which type of cannabinoid and at what amounts are used.

Here are some examples of THC toxicity that have been published:

• Heart arrhythmias: Some doctors believe that heart disturbances are under-reported in marijuana use. Since smoking weed and taking other drugs often go together, it’s really hard to isolate the cause when the heart starts doing crazy things. Even drinking alcohol intensifies the effects, which means you can’t say for sure whether it was the pot or the booze that caused a problem.
• Psychosis or paranoia: There have been some reports of severe psychotic episodes with hallucinations and negative associations. In some cases, the psychosis can last significantly longer than the amount of time it should take to metabolize the THC.
• Uncontrollable vomiting: Although THC often has anti-nausea properties, it can rarely be associated with a syndrome of persistent vomiting. More often associated with chronic cannabis use, uncontrollable vomiting is sometimes relieved with a hot shower.

Edible Overdose

Even the method of consumption makes a difference. For example, a person may consume too much THC in edible form because it takes longer to see an effect. If one brownie doesn’t work, they take another. and maybe just one more. Suddenly, they have a serious reaction.

THC that is consumed in edible form is metabolized differently than when it’s inhaled. It takes longer to absorb THC in edibles, which can lead to to someone thinking they didn’t get enough.

Edibles are also much more prone to accidental overdoses. Smoking marijuana doesn’t usually happen accidentally. But with an edible, someone may consume a candy or brownie without realizing it contains THC.

Marijuana Overdose in Children

Kids are especially likely to accidentally consume an edible containing THC, since these often look like regular candy that kids might want to try. Edibles are often meant to be consumed in very small doses (like 1/4 of a gummy), but of course, kids aren’t aware of that; and their smaller body size also leaves them vulnerable to over-consuming.

Children presenting to the emergency department with accidental ingestion of marijuana becomes increasingly common in every state that legalizes marijuana for recreational use.

If you or your child are experiencing the signs of a marijuana overdose, call 911 or seek emergency medical treatment immediately.

Increased Concerns About Overdose

There are several reasons that medical and health experts have become concerned about the potential for marijuana overdose and adverse effects.

Increased Marijuana Use

Marijuana has been available for medicinal use since 1996 when California legalized it. Now, California, Alaska, Colorado, Maine, Massachusetts, Michigan, Nevada, Vermont, Washington, and Washington D.C. allow recreational use. In Oregon, the number of dispensaries doubled after recreational weed was legalized.

As the momentum of recreational pot builds across the country, many in the medical world report being a bit surprised by the marked increase in marijuana use in states where it has been legalized. All that new consumption has led to significant increases in marijuana-induced emergency department visits.

Increased THC Concentration

Just as modern farmers are able to get much bigger yields from crops like corn and beans, weed farmers today are much more successful than they were in the past. The levels of THC in marijuana are well above what they were before the current farmers were born.

The concentrations of THC increased from 3.4% in 1993 to 8.8% in 2008. Some folks say that just means you don’t have to roll the blunts as fat as you used to, but let’s face it: When you’re chasing the high, the bar just keeps getting higher.

How Long Does Weed Stay in Your System?

How long weed stays in your system mostly depends on how much of the drug you’ve used. If you chronically use marijuana, it can be detected in urine for 30 days or longer once you stop using it.

If you used marijuana once (and you don’t typically use it), it can be detected in urine for up to 72 hours.

How to Stop Feeling High

If you’ve used marijuana and you want to stop feeling the high, you’ll need to wait it out. But there are some things you can do in the meantime to self-soothe like relaxing, hydrating, eating, or walking.

There’s no instant cure for a marijuana high, but to calm down any anxiety or racing thoughts you might have, try deep breathing, watching a soothing video, or listening to calming music to distract yourself. You might even call a friend who can help keep you calm until the effects wear off.

Drinking plenty of water is always a good idea, especially to prevent dry mouth that marijuana often causes. Though eating isn’t proven to reduce a marijuana high, there is anecdotal evidence that carb-heavy and nutrient-dense foods make some people feel less high.

Some research supports using cannabidiol (CBD) to promote relaxation and reduce the psychoactive effects of THC. It’s recommended you check with a doctor before using any supplement or at least start with a low dosage of CBD until you know how it affects you.

Treatment for Weed Overdose

If you are hospitalized with marijuana intoxication, you may be kept overnight for 24-hour observation. You may also receive fluids intravenously (through an IV) if you’re showing signs of dehydration.

Depending on the severity of your symptoms, you may be administered a benzodiazepine to lessen anxiety or an antipsychotic to reduce psychosis.

If you’ve developed cannabinoid hyperemesis syndrome, a condition that leads to bouts of repeated vomiting in people who chronically use marijuana, a doctor can treat this with IV fluids, medication to reduce vomiting, and/or proton-pump inhibitors, which reduce stomach inflammation. It should take 24 to 48 hours to recover from cannabinoid hyperemesis syndrome as long as you stop using cannabis.

If your marijuana intoxication is linked with cannabis use disorder, a doctor may recommend that you attend an inpatient or outpatient rehabilitation program to address your condition. Rehabilitation programs often involve group therapy and educational sessions where you’ll learn how to use healthy coping mechanisms instead of turning to drugs or alcohol.

A Word From Verywell

Marijuana overdose is still a debated topic and there isn’t really a clear answer on how much pot is too much. Until there is, it’s important to be diligent if you choose to use and to keep yourself informed. Don’t accept the mantra that weed is natural and therefore, safe. What makes anything safe is an informed consumer and a critical mind.

11 Sources

Verywell Mind uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.

1. Sharpe L, Sinclair J, Kramer A, de Manincor M, Sarris J. Cannabis, a cause for anxiety? A critical appraisal of the anxiogenic and anxiolytic properties. J Transl Med. 2020;18(1):374. doi:10.1186/s12967-020-02518-2
2. UpToDate. Cannabis (marijuana): Acute intoxication.
3. Orsini J, Blaak C, Rajayer S, et al. Prolonged cardiac arrest complicating a massive ST-segment elevation myocardial infarction associated with marijuana consumption. J Community Hosp Intern Med Perspect. 2016;6(4):31695. doi:10.3402/jchimp.v6.31695
4. Greydanus DE, Hawver EK, Greydanus MM, Merrick J. Marijuana: current concepts. Front Public Health. 2013;1. doi:10.3389/fpubh.2013.00042
5. Fitzgerald KT, Bronstein AC, Newquist KL. Marijuana poisoning. Top Companion Anim Med. 2013;28(1):8-12. doi:10.1053/j.tcam.2013.03.004
6. Whitehill JM, Dilley JA, Brooks-Russell A, Terpak L, Graves JM. Edible cannabis exposures among children: 2017–2019. Pediatrics. 2021;147(4):e2020019893. doi:10.1542/peds.2020-019893
7. Mehmedic Z, Chandra S, Slade D, et al. Potency trends of Δ9-THC and other cannabinoids in confiscated cannabis preparations from 1993 to 2008. J Forensic Sci. 2010;55(5):1209-17. doi:10.1111/j.1556-4029.2010.01441.x
8. Moeller KE, Kissack JC, Atayee RS, Lee KC. Clinical interpretation of urine drug tests. Mayo Clinic Proceedings. 2017;92(5):774-796. doi:10.1016/j.mayocp.2016.12.007
9. Ferber SG, Namdar D, Hen-Shoval D, et al. The “Entourage Effect”: terpenes coupled with cannabinoids for the treatment of mood disorders and anxiety disorders. Curr Neuropharmacol. 2020;18(2):87-96. doi:10.2174/1570159X17666190903103923
10. Cedars-Sinai. Cannabinoid hyperemesis syndrome.
11. Sherman BJ, McRae-Clark AL. Treatment of cannabis use disorder: Current science and future outlook. Pharmacotherapy. 2016;36(5):511-535. doi:10.1002/phar.1747

By Rod Brouhard, EMT-P
Rod Brouhard is an emergency medical technician paramedic (EMT-P), journalist, educator, and advocate for emergency medical service providers and patients.

You Might Not Overdose on Cannabis, But You Can Still Overdo It

Can you overdose on cannabis? This question is controversial, even among people who frequently use cannabis. Some people believe cannabis is as dangerous as opioids or stimulants, while others believe it’s completely harmless and has no side effects.

You can’t overdose on cannabis in the way that you can overdose on, say, opioids. To date, there have not been any reported deaths resulting solely from cannabis use, according to the Centers for Disease Control and Prevention (CDC).

But that doesn’t mean you can’t overdo it or have a bad reaction to cannabis.

There isn’t a straightforward answer here because everybody’s different. Some people seem to tolerate cannabis well, while others don’t tolerate it well at all. Cannabis products also vary greatly in their potency.

Edibles, however, seem to be more likely to cause a negative reaction. This is partly because they take a long time to kick in.

After eating an edible, it can be anywhere from 20 minutes to 2 hours before you start to feel the effects. In the meantime, many people end up eating more because they mistakenly believe the edibles are weak.

Mixing cannabis with alcohol can also cause a negative reaction for some people.

Cannabis products containing high levels of tetrahydrocannabinol (THC), the chemical that makes you feel “high” or impaired, can also cause a bad reaction in some people, especially those who don’t use cannabis often.

Cannabis can have quite a few less-than-desirable side effects, including:

• confusion
• thirstiness or a dry mouth (aka “cotton mouth”)
• concentration problems
• slower reaction times
• dry eyes
• fatigue or lethargy
• headaches
• dizziness
• increased heart rate
• anxiety and other changes in mood

In rarer cases, it can also cause:

• hallucinations
• paranoia and panic attacks
• nausea and vomiting

These side effects can last anywhere from 20 minutes to a full day. In general, cannabis that’s higher in THC is associated with more severe, long-lasting effects. And yes, it’s possible to wake up with a “weed hangover” the following day.

If you or a friend has overindulged, there are a few things you can do to reduce the unpleasant side effects.

Relax

If you’re feeling anxious, it’s good to self-soothe by telling yourself that you’ll be OK. Remind yourself that nobody has ever died from a cannabis overdose.

It might not feel like it right now, but these symptoms will pass.

Eat something

If you’re feeling nauseated or shaky, try to have a snack. This might be the last thing you want to do, especially if you also have dry mouth, but it makes a big difference for some people.

Drink water

Speaking of dry mouth, make sure you drink plenty of liquids. This is especially important if you’re vomiting, which can dehydrate you.

If you’re panicking, try slowly sipping water to help ground yourself.

Sleep it off

Sometimes, the best thing to do is wait for the effects to subside. Sleeping or resting is a good way to pass time while you wait for the cannabis to work its way out of your system.

Avoid overstimulation

If too much is happening around you, it can make you anxious and even paranoid.

Switch off the music or TV, leave the crowd, and try to relax in a calm environment, like an empty bedroom or bathroom.

Chew or sniff black peppercorns

Anecdotally, many people swear that black peppercorns can soothe the side effects of overindulging in cannabis, especially anxiety and paranoia.

According to research , black peppercorns contain caryophyllene, which might weaken the uncomfortable effects of THC. But this remedy hasn’t been rigorously studied, and there is no evidence in humans to support it.

Call a friend

It may be helpful to call a friend who has experience with cannabis. They may be able to talk you through the unpleasant experience and calm you down.