Couch lock

Couch lock (also written as couchlock or couch-locked) is an informal term for a heavy, deeply relaxed body sensation that comes after taking cannabis, where getting up or moving feels like a real effort.

The term couch lock describes a sedative effect people report and is not a medical diagnosis or recognised clinical condition, Couch Lock is also used as a name for a strain of cannabis.

At a glance: Couch lock

What is couch lock?

Couch lock is an informal term used for describing the heavy, sedating effect that can sometimes be caused by cannabis.

The term is used to describe when you feel ‘locked’ into sitting or lying in the same place, for some it is an unwanted side effect, but it can be a treatment goal for others.

Why does couch lock happen?

There is rarely one single cause that can make couch lock happen; it comes from a combination of how much THC you’ve taken, what else is in the product, how it was taken and your body's tolerance.

THC is often the main driver. At lower doses THC can help with pain and relaxation, but as the dose rises, the effects on the body and coordination become stronger and sedation becomes more likely to trigger couch lock.

Other compounds found in medical cannabis can contribute to that heavy feeling. CBN is formed as THC breaks down over time, a laboratory study in rats suggests it may have sedative effects but only in doses higher than people would get from medical cannabis.

Terpenes, which are the aromatic and flavour compounds, may also play a part. Myrcene, a terpene that is often linked with indica strains of medical cannabis, is associated with calming, sedative effects.

The evidence on terpenes is still limited. But it’s thought that they enhance the effect of cannabinoids, a theory known as the “entourage effect.”

The way in which medical cannabis is taken can also cause couch lock. Oils, capsules and pastilles have a delayed onset of effects as they pass through the liver and digestive system first, meaning effects may not be felt as quickly as vaporising medical cannabis.

This delay can lead some people to take more before their first dose has fully worked, and taking high levels of THC can cause effects to last longer and increase the risk of side effects.

People who are new to medical cannabis or returning after a break haven’t built up tolerance so a dose that suits an experienced patient can feel overwhelming. Tolerance shifts over time which is why couch lock can appear after a change in dose, product or routine, even if you've been taking medical cannabis for a while. 

Couch lock and Indica

There is a common belief that certain strains of cannabis are more likely to cause couch lock. Indica, which is often associated with sedating effects, is a subspecies of cannabis that is often believed to cause the sensation.

However, strain labels like indica and sativa are not a reliable predictor of effects. The labels are descriptions of the plant's lineage and how they look, not the effects they have.

Decades of crossbreeding have also blurred the lines; two medical cannabis products labelled indica could have varying cannabinoid levels and terpene profiles.

Researchers prefer to describe what’s actually inside the cannabis plant using the term chemovar, which is short for ‘chemical variety’ and focuses on the chemicals a plant produces such as cannabinoids and terpenes.

Clinicians use the plant’s chemical profile too, focusing on THC and CBD content rather than strain labels when deciding prescriptions and their doses.

Is couch lock dangerous? 

Couch lock is not considered dangerous, but it can be an unwelcome experience. 

Some people enjoy the feeling of being ‘locked’ to the sofa, and some medical cannabis patients may take their prescription to relieve pain and help them relax. Other patients who need to stay alert and active may consider it an unwanted side effect that’s worth raising with their clinician.

Couch lock can come alongside other effects: drowsiness is the most common, and people may find themselves dozing off or struggling to concentrate. You may also experience slower reactions, mild dizziness, dry mouth or red eyes.

It’s also common for people to have an increase in hunger, often known as the munchies. These effects are usually temporary and fade as the effects of the cannabis wear off.

If you feel couch-locked, drowsy or slowed down in any way, you must not drive. In the UK, the law is clear that it is illegal to drive while impaired by any drug, including cannabis, whether it is prescribed for medical use or not.

The legal limit of THC is 2 micrograms per litre of blood in England, Wales and Scotland. A valid prescription gives you a statutory medical defence for being over the limit  when taken as prescribed but cannot be used if you are impaired. 

How prescribed patients can avoid couch lock

Medical cannabis patients looking to avoid couch lock should notify their clinician if they experience it rather than trying to manage it on their own. Your specialist doctor can adjust your treatment plan and make changes safely.

The simplest way to avoid couch lock is to not take more than your body needs. When starting treatment, coming back from a break, or changing products, clinicians will usually recommend you start with a small dose and build up gradually. 

In most cases, doctors will ask patients to titrate their medical cannabis. Titration is the process of starting with a very small dose and gradually increasing the amount and potency until you reach the desired effect.

This method allows patients to find their optimal dosage without experiencing unwanted side effects such as “couch lock.”

The timing of your medication can make a big difference. If sedating side effects are getting in the way of your day, ask your clinician whether your schedule can be adjusted so the sedating dose falls in the evening when drowsiness is less disruptive.

If couch lock is an effect that keeps happening, the product itself may not be the right fit for you and your clinician can suggest a different chemovar, such as one with a lower THC percentage or different terpene profile. Always talk to your clinician first about product or dosage changes.

Keeping a diary of your symptoms can help give your clinician clear evidence to work with at your follow-up appointments and spot patterns to adjust your treatment.

You should never try to manage your side effects by using unprescribed or illicit cannabis alongside or instead of your prescription. Street products are unregulated, so the THC content and contaminants are unknown, which makes effects like couch lock harder to predict.

What to do if you experience couch lock

Couch lock effects can be a treatment goal for some patients, as evening sedation may be beneficial for patients with pain or insomnia under clinical guidance.

If you do experience unwanted couch lock, it is best to stay hydrated and rest somewhere safe until the effects pass. The effects of couch lock usually pass within a few hours, but you can contact your clinic if effects are severe and persistent.

Frequently asked questions about couch lock

What does the term couch lock mean? 

Couch lock is an informal term used to describe the heavy feeling of relaxation some people may experience after taking cannabis, that leaves them ‘locked’ when sitting or lying down.

Is couch lock a sativa or indica strain?

Couch lock is often associated with indica strains as it is often described as having sedative effects. However, strain labels are not reliable predictors of effects as they describe the plant's appearance and lineage, not its chemical makeup.

How do you avoid couch lock?

The most effective way to avoid couch lock is to titrate your dose, starting with small amounts and working your way up as your tolerance builds; always speak to a clinician first about side effects or changing your dose.

Is couch lock good or bad?

Couch lock can be a wanted effect for those looking to help ease pain management and relaxation in the evening; for some, it can be a negative that stops them from being active and alert during the day.

How long does couch lock last?

Couch lock can last a few hours when medical cannabis is vaporised and may last longer with oils and edibles, as they have a delayed onset of effects that can last longer.

Does indica get you more stoned?

Indica is a label to classify a subspecies of cannabis plants and refers to its lineage and appearance, not its effects. The chemovar of the plant can provide insight into the effects as it describes the chemicals such as levels of THC content.

To find out if you are eligible, try our free medical cannabis eligibility checker, it takes less than 30 seconds to fill in.

Our medical cannabis glossary can also help you learn more about terms you may associate with medical cannabis. 

Releaf - redefining healthcare