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Edibles and THC Overdose

Edibles are food and drinks that are infused with marijuana extract (cannabis-infused oils and cannabutter) and contain varying amounts of the psychoactive ingredient THC (tetrahydrocannabinol).1 Edibles are sometimes considered to be a safe and effective way of experiencing the therapeutic or intoxicating effects of marijuana. However, many consumers do not understand that the duration of onset (how long it takes for effects to be felt) is often longer with edibles because they are ingested and therefore metabolized through the digestive tract.2, 3

These unknown or highly variable factors can lead to unexpected adverse effects or accidentally ingesting more of the drug than expected and may result in a THC overdose.1

What Are Edibles?

Edibles are food and drink products that are made with marijuana extract. Marijuana edibles come in various forms and can be commercially made or homemade, and can include:3, 8

  • Baked goods.
  • Candies, chocolates, and gummies.
  • Beverages.
  • Lozenges.
  • Cooking oils and butter.

There is an increased risk of marijuana toxicity, poisoning, or overdose when eating or drinking food and beverages infused with marijuana compared with smoking marijuana.1

Eating or drinking THC usually takes between 30 minutes to an hour, and as long as 2 hours before a person feels the psychoactive effects.2 The subjective “high” that’s produced (relaxation and/or euphoric feelings), can last anywhere from 5 to 8 hours, much longer than other routes of marijuana administration.2

By contrast, when cannabis is smoked, THC is delivered to the brain almost immediately, with maximum effects present after 30 minutes and lasting 1 to 3.5 hours.2

Ingesting edibles, rather than smoking marijuana, can delay the onset of the marijuana’s effects, which can make it difficult for people to control their dosing of the drug.1, 2 Intoxicating effects can last longer than expected depending on the amount ingested, last food eaten, and medications or alcohol used at the same time.1

This may lead people to mistakenly consume higher amounts of THC than they intended because they don’t feel the effects of earlier doses and can increase the risk of experiencing an unintentional THC overdose.1, 3 An overdose on THC is not likely to be fatal, but it can be very uncomfortable and may cause symptoms of psychosis or lead to serious physical injury.2

Can You Overdose on THC or Edibles?

Yes, it is possible to overdose on THC, the psychoactive ingredient in marijuana.3 A limited amount of precise data exists on the association between cannabis use and overdose fatality or injury.8 However, the increased availability and potency of a wide variety of cannabis products creates a potential for an increased risk of harm due to overdose.8

THC overdoses typically aren’t fatal but can lead to extreme discomfort, unpleasant experiences, accidental injury, and even death because of cannabis-induced behavioral impairment.3

Eating marijuana carries a higher risk of overdose than smoking it. Research suggests that this is because the amount of THC a person has consumed can be more difficult to predict when eating marijuana compared with smoking it. Eating an edible containing cannabis results in slower onset and longer duration of psychoactive effects.1

Signs of a THC Overdose

A marijuana overdose is becoming increasingly common for a variety of reasons. An overdose of THC is dose-related, and the risk of overdose is higher when eating marijuana vs. smoking it.

Common symptoms of a THC overdose can inlcude:3, 5

  • Poor cognitive functioning.
  • Motor impairment.
  • Anxiety.
  • Panic and fear.
  • Agitation.
  • Extreme sedation.
  • Cardiac stress.
  • Vomiting.
  • Psychotic symptoms (e.g., hallucinations, delusions).

THC Overdose Treatment

If you are experiencing an overdose of marijuana or any type of substance, call 911 and seek medical attention immediately. Once stabilized, limiting your cannabis use and seeking further treatment for cannabis use disorder are both options to help prevent future overdoses.

THC Dosage Control in Edibles

The dosage of THC in an edible can vary and be difficult to control or even know.1, 3, 8 This is true for both commercially made products, homemade products created with commercially prepared oils or butters, and products made at home from homemade cannabis oil or cannabutter.

The THC concentration in homemade edibles varies depending on the plant it’s extracted from, and the extraction process used to make the oil or butter in the edible.3 Commercial products are usually required by state law to include the amount of THC and the number of servings on the label. However, a single cookie or chocolate bar, for example, could contain many more servings than the maximum recommended dose.

Increasing Use of Edibles

Edible use is on the rise with the legalization of marijuana for recreational use in more and more states. Studies of adolescents show that edible use is increasing among high school seniors, while the number of students smoking marijuana is dropping.4

Teenage edible users are also more likely to use them daily opposed to those who smoke marijuana.6 Since edibles are often found in candy form, children may mistake them for regular snacks or candy, which can make them sick or lead to an edible overdose.1

Hazards of Edibles and THC Levels

The THC in edibles is metabolized differently than it is when smoking marijuana. A person’s individual metabolic rate can alter the way edibles affect them.3 A person’s age, gender, and weight are just a few factors that may impact when and for how long effects are felt.3 This can lead to more prolonged and intense side effects. The THC in edibles can also interact with other drugs, alcohol, or medications.2, 3

People who use cannabis regularly for many years may be at risk for developing an episodic, cyclical vomiting syndrome called cannabinoid hyperemesis syndrome (CHS).7 Long-term cannabis use (including smoking and eating marijuana), especially at high regular doses, puts a person at increased risk of CHS. Severe abdominal pain, nausea and vomiting, and visits to the hospital are common in people experiencing this syndrome.7

Negative psychiatric side effects, such as anxiety, paranoia, and even a psychotic reaction involving agitation, hallucinations, and delusions, can occur with an overdose of eating or smoking marijuana.1, 3

The availability of edibles has been associated with an increased rate of accidental ingestion of cannabis in children.2 Adults and pets, as well as children, can mistake marijuana edibles for food, candy, or treats.1 For this reason, the Centers for Disease Control and Prevention recommends that if you use marijuana products such as edibles, you keep them in childproof containers and out of reach of children or pets.1

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