Testing Risperidone with Olanzapine for schizophrenia and related disorders
Official title: "Extended" (Alternate Day) Antipsychotic Dosing
"Re-examining Maintenance Antipsychotic Treatment in Schizophrenia: "Extended" Antipsychotic Dosing"
Interventions
Risperidone
0.25 mg, 0.5 mg, 1 mg, 2 mg, 3 mg and 4 mg Tablets
Olanzapine
2.5 mg, 5 mg, 7.5 mg, 10 mg, 15 mg, 20 mg Tablets
paliperidone
3 mg, 6 mg, 9 mg Tablets
Canadian Sites (1)
Centre for Addiction and Mental Health
Toronto, Ontario, Canada
Eligibility Criteria
See who this study is looking for15 criteria
The trial’s own eligibility text, word for word from the registry. Only the trial site can say who takes part.
Inclusion
- +(vi) stabilized as outpatients with a single oral AP (risperidone or olanzapine or paliperidone\*) at the same dose for ≥3 months i. On a prescribed risperidone dose of between 1-6mg, or a prescribed olanzapine dose of between 5-20mg, or a prescribed paliperidone 3-12mg
- +(i) A primary diagnosis of a Schizophrenia Spectrum or Other Psychotic Disorder as defined by the DSM-5 diagnosis and confirmed by the MINI (Version 7.0.2)
- +(ii) age 18 or older
- +(iv) ability to communicate in English
- +(v) capacity to provide written, informed consentInformed consentThe process of being told what taking part involves, then choosing freely.Read more →, as assessed using the MacCAT-CR at time of consent
- +(vii) evidence of adherence with current AP treatment
- +(iii) female participants of childbearing potential must be using a reliable method of contraception and have a negative pregnancy test at the time of enrolmentEnrolmentThe number of participants a study plans to include, or has included.Read more → and must, in the investigatorPrincipal investigatorThe doctor or researcher responsible for running the study at a site.Read more →'s opinion, practice a clinically accepted, reliable method of contraception during this study. Male participants must not father a baby during their time in the study
Exclusion
- −(vi) allergy to the study drugs and their excipients
- −(vii) allergy (e.g., galactosaemia) or severe intolerance to lactose
- −(i) exposure to a depot AP within 1 year (i.e., no depot AP injection within the last year)
- −(ii) Current diagnosis of substance use disorder according to DSM-5 criteria (verified through the MINI for Psychotic Disorders (Version 7.0.2) and a positive drug screen for street and /or prescription drugs not prescribed to the participant by treating physicians
- −(iii) ECT within the last 3 months
- −(v) neurological condition (dementia including Alzheimer's disease, multiple sclerosis, epilepsy, stroke, or traumatic brain injury)
- −(viii) negative urine drug screen result for Olanzapine or Risperidone or Paliperidone (if applicable)
- −(iv) pregnancy or lactation
In plain language
Assembled directly from this trial’s registry record. Every sentence traces to a field below — nothing here is generated or interpreted.
What this study is
This study is testing a treatment for a condition.
Phase 4Phase 4A study of a treatment that is already approved and in use.Read more → — a study of a treatment already approved for use, following it in everyday practice.
What is being given or done in this study: Risperidone, Olanzapine, paliperidone.
From the trial registry
Built from these fields:
- designModule.designInfo.primaryPurpose
- designModule.phases
- armsInterventionsModule.interventions[].name
How the study is run
Which group you would be placed in is decided by chance, like a coin flip — not by you and not by your doctor.
You, the study team, the people giving the treatment, and the people analysing the results would all be kept unaware of which group you are in until the study ends.
From the trial registry
Built from these fields:
- designModule.designInfo.allocation
- designModule.designInfo.maskingInfo.masking
Is there a placebo?
This study does not list a placeboPlaceboA dummy treatment with no active medicine, used for comparison.Read more → group.
One group receives no study treatment at all, and is followed for comparison.
There are 2 groups in this study.
From the trial registry
Built from this field:
- armsInterventionsModule.armGroups[].type
Who the study is looking for
The study lists a minimum age of 18 years, with no upper limit given.
The study is open to people of any sex.
The study does not accept healthy volunteersHealthy volunteerSomeone without the condition being studied who takes part anyway.Read more →.
These are the criteria the study lists. Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can decide whether someone can take part.
From the trial registry
Built from these fields:
- eligibilityModule.minimumAge
- eligibilityModule.sex
- eligibilityModule.healthyVolunteers
How big and how long
The study aims to enrol about 120 people.
The study is currently expected to finish around September 2028.
The main measurement is taken over: 0 and 52 weeks.
From the trial registry
Built from these fields:
- designModule.enrollmentInfo.count
- statusModule.completionDateStruct.date
- outcomesModule.primaryOutcomes[].timeFrame
What the study measures
Clinical Deterioration using the "Brief Psychiatric Rating Scale - Expanded" — measured over 0 and 52 weeks.
From the trial registry
Built from these fields:
- outcomesModule.primaryOutcomes[].measure
- outcomesModule.primaryOutcomes[].timeFrame
Source: NCT04478838 on ClinicalTrials.gov. The full registry text is further down this page — this summary never replaces it.
Not medical advice. What do these terms mean?
What is being tested — in plain terms
About RisperidoneDrug
0.25 mg, 0.5 mg, 1 mg, 2 mg, 3 mg and 4 mg Tablets
From the trial registry — its own words, unedited.
What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.
Read the full explanation → · in clinical review
About OlanzapineDrug
2.5 mg, 5 mg, 7.5 mg, 10 mg, 15 mg, 20 mg Tablets
From the trial registry — its own words, unedited.
What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.
Read the full explanation → · in clinical review
About paliperidoneDrug
3 mg, 6 mg, 9 mg Tablets
From the trial registry — its own words, unedited.
What a drug is here: A medicine — a chemical or small-molecule treatment — given as the thing being studied.
Read the full explanation → · in clinical review
Common questions
Answered from this trial’s registry record. Where the record doesn’t say, these answers say so rather than filling the gap.
Am I eligible for this trial?
Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can decide whether someone can take part. Concord cannot make that determination, and neither can any tool that has not examined you.
What the study lists: a minimum age of 18 years.
The full inclusionInclusion criteriaThe things you must have or be for a study to consider you.Read more → and exclusion criteriaExclusion criteriaThe things that would prevent someone from taking part.Read more → are published on this page, exactly as the study team wrote them.
The useful next step is to bring this trial to your doctor. Answering a few questions first gives them something concrete to review.
From the trial registry
- eligibilityModule.minimumAge
- eligibilityModule.eligibilityCriteria
Is there a placebo?
This study does not list a placeboPlaceboA dummy treatment with no active medicine, used for comparison.Read more → group.
One group receives no study treatment and is followed for comparison.
From the trial registry
- armsInterventionsModule.armGroups[].type
Would I know which treatment I am getting?
You, the study team, the people giving the treatment, and the people analysing the results would all be kept unaware of which group you are in until the study ends.
Which group you would be placed in is decided by chance, like a coin flip — not by you and not by your doctor.
From the trial registry
- designModule.designInfo.maskingInfo.masking
- designModule.designInfo.allocation
Who can join?
The study lists a minimum age of 18 years, with no upper limit given.
It is open to people of any sex.
It does not accept healthy volunteersHealthy volunteerSomeone without the condition being studied who takes part anyway.Read more →.
Only the trial siteTrial siteA hospital or clinic where a study is actually run.Read more → can confirm whether a particular person can take part.
From the trial registry
- eligibilityModule.minimumAge
- eligibilityModule.sex
- eligibilityModule.healthyVolunteers
How long would this take?
The study's main measurement is taken over: 0 and 52 weeks.
The study as a whole is currently expected to finish around 2028-09-30.
How long any one person takes part can differ from the study length. The study team can tell you what the schedule looks like in practice.
From the trial registry
- outcomesModule.primaryOutcomes[].timeFrame
- statusModule.completionDateStruct.date
How many people are taking part?
The study aims to enrol about 120 people.
From the trial registry
- designModule.enrollmentInfo.count
Where is this happening?
This study lists one location: Toronto, Ontario, Canada.
Sites can open and close during a study, so confirm with the team before travelling.
From the trial registry
- trial_locations
About This Trial
The study wishes to examine whether "extended" antipsychotic treatment, in this case, antipsychotic treatment every other day, is as effective as daily treatment. It is also evaluating whether there may be differences in terms of side effects. Participants will be randomly assigned to either the treatment as usual group (i.e., taking antipsychotic daily) or the extended dosing group (i.e., taking antipsychotic one day on, one day off). That means, like flipping a coin, there is a 50/50 chance that participants will continue on daily dosing of your antipsychotic or have it switched to every other day dosing. This study will last for 1 year. Participants will be evaluated at the beginning and every two weeks during the first 6 months, with visits once every 4 weeks for the final 6 months. In total, participants will make 22 visits over 52 weeks to the investigator's office. The investigators hypothesize that with ED, there will be no change in symptom severity but improvement in the frequency and severity of side effects, wellbeing, and functioning.
Worth passing on?
Save it to the Care Package and send it to them, or to their doctor, in one message. Whether they follow it up is theirs to decide.
Review the Care PackageThis page is for informational purposes only and does not constitute medical advice. Clinical trial eligibility can only be determined by the trial site after proper screening. Trial information is sourced from ClinicalTrials.gov and may not reflect the most current status. Always consult your healthcare provider before making decisions about clinical trial participation.