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Can a website help people cut back on cannabis?

NCT ID NCT04517474

Disease control Sponsor: Parc de Salut Mar Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Sep 16, 2026 · Last updated Sep 17, 2026 · Updated 1 time

Summary

Researchers are testing a Spanish version of CANreduce, a web-based self-help program that uses cognitive behavioral therapy and motivational interviewing to help people reduce their cannabis use. The trial compares three groups: one gets the program plus psychological support, one gets the program alone, and one waits. Participants are adults who use cannabis at least weekly and have internet access.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
CANreduce, a web-based self-help program using cognitive behavioral therapy and motivational interviewing
What this could lead to
If it works, this could give people who avoid clinics a private, low-cost way to cut back on cannabis use.
What could go wrong
Web programs often lose users over time, and self-reported use can be unreliable. The trial may show little difference between the guided and unguided versions.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

300 people

The number who actually took part.

Started

Nov 2020

Finished

Dec 2022

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Cannabis use of at least once a week 30 days prior to study entry * At least 18 years old * At least weekly internet access and a valid email address Exclusion Criteria: * Participant reports current pharmacological psychiatric disease or history of psychosis, schizophrenia, bipolar type I disorder or significant current suicidal or homicidal thoughts * Use of other pharmacological and psychosocial treatments for cannabis use disorders * Inability to read or write in Spanish

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Conditions

The condition(s) this trial relates to.

cannabis dependence Psychological Well-Being Treatment Adherence and Compliance

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Cannabis use disorder

Contacts and locations

Locations

  • Juan-Ignacio Mestre-Pinto

    Barcelona, Catalonia, 08003, Spain

More trials for these conditions

Other studies related to the condition(s) this trial covers.