Condition category
Mental and Behavioural Disorders
Date applied
Date assigned
Last edited
Retrospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Not provided at time of registration

Trial website

Contact information



Primary contact

Dr Wendy Spettigue


Contact details

Psychiatric Director
Eating Disorder Program
Children's Hospital of Eastern Ontario
401 Smyth Road
K1H 8L1

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title


Study hypothesis

It is hypothesised that youth who present with a severe eating disorder and are treated with olanzapine will demonstrate reduced disordered eating attitudes and beliefs, and a higher rate of weekly weight gain, as compared to a control group treated with placebo. It is also hypothesised that those patients treated with olanzapine will demonstrate better short-term (14 weeks) and long-term (6 months) clinical outcome as compared to patients treated with placebo. It is also predicted that the physical side-effects of olanzapine will be minor given the relatively lose dose (as compared to treatment for patients with schizophrenia), slow titration, and short-term use of olanzapine. Hospitalised patients on olanzapine may be discharged sooner than those on placebo.

Ethics approval

Not provided at time of registration

Study design

Randomised controlled trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting

Not specified

Trial type


Patient information sheet


Anorexia Nervosa


Olanzapine versus Placebo; Olanzapine will be started at a very low dose and gradually titrated up to a predetermined dose.

Intervention type



Not Specified

Drug names


Primary outcome measure

The change from baseline in the Eating Attitudes Test (EAT-26) score measured at week 12 and average weight gain over the first 12 weeks of treatment will be compared using Student’s t-test (assuming a normal distribution of the measures; otherwise, Wilcoxon Mann Whitney test will be used). If necessary, a linear regression model will be fit to assess treatment effect adjusting for variables thought to influence outcome that could result in imbalance between treatment groups at baseline. Treatment effect and its 95% confidence interval will be generated for each primary outcome.

Secondary outcome measures

Although the study is not powered to detect differences in safety, we will nevertheless compare the frequency of adverse events between the two study groups using chi-square or Fisher’s exact test. Change from baseline in the EAT-26 score measured at week 15 and at the end of the maintenance period (week 40) as well as weight gain measured at the same time points will be analysed as for the primary outcomes. Change from baseline in the Computer Assisted Personal Interview (CAPI), Children’s Depression Inventory (CDI), Multidimensional Anxiety Scale for Children (MASC), the Eating Disorder Clinician-Parent Rating Sheet, and Child Behavior Checklist (CBCL) will be calculated for weeks 12 and 40. Assuming a normal distribution for each variable (except for the clinician/parent rating sheet), differences between study groups will be assessed using Student’s t-tests. Wilcoxon Mann-Whitney tests or log-transformation will be performed otherwise. The Eating Disorder Clinician/Parent Rating Sheet score will also be compared using a Wilcoxon Mann-Whitney test. A Poisson regression model will be used to compare the total number of hospital admissions between study groups. Rate of hospitalisation will be calculated for each patient as the total number of days in hospital divided by the total time in days spent in the study. Average rates and 95% confidence intervals will be generated for each study group. Rates will then be compared using a Poisson regression model. In order to avoid multiple testing issues, results will be compared with an alpha value adjusted for the number of tests performed using the Bonferonni criterion.

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Must give written informed consent or assent
2. Must be female
3. Must be between age 12 and 17 (younger than 18) at beginning of trial
4. Based on the Diagnostic and Statistical Manual of Mental Disorders (4th Edition – Revised, American Psychiatric Association [APA], 2000) must have fulfilled the criteria for diagnosis of Anorexia Nervosa or Eating Disorder Not Otherwise Specified with a Body Mass Index ≤17

Participant type


Age group




Target number of participants

50 subjects; 25 intervention, 25 control

Participant exclusion criteria

1. Subject has known sensitivity to any of the products to be administered
2. Treatment with any other anti-psychotic medication, mood stabiliser, stimulant
3. Treatment with medication known to interact with olanzapine e.g. fluvoxamine, ciprofloxacin
4. Medical illness such as: diabetes, impaired glucose tolerance, hyperlipidemia, hepatic dysfunction, substance abuse, narrrow angle glaucoma, paralytic ileus, or pancreatitis
5. Subject’s inability to comply with trial requirements including lack of comprehension of English
6. Other unspecified reasons that, in the opinion of the Investigator, make subject unsuitable for enrollment
7. Subject is pregnant or is breast-feeding
8. Laboratory exclusion criteria:
a. Total white cell count <2.5
b. Neutrophil count <1.0
c. Liver function tests (aspartate transaminase (AST)/alanine transaminase (ALT) >2 X normal)
d. Positive pregnancy test
e. Electrocardiogram (EKG) – QTc >440 msec or arrythmia other than sinus bradycardia; conduction abnormalities prolonged QTc or other

Recruitment start date


Recruitment end date



Countries of recruitment


Trial participating centre

Psychiatric Director
K1H 8L1

Sponsor information


Children's Hospital of Eastern Ontario (Canada)

Sponsor details

401 Smyth Road
K1H 8L1
+1 613 737 7600

Sponsor type

Hospital/treatment centre



Funder type


Funder name

W. Garfield Weston Foundation (Canada)

Alternative name(s)

Funding Body Type

private sector organisation

Funding Body Subtype




Results and Publications

Publication and dissemination plan

Not provided at time of registration

Intention to publish date

Participant level data

Not provided at time of registration

Basic results (scientific)

Publication list

2008 protocol in

Publication citations

  1. Protocol

    Spettigue W, Buchholz A, Henderson K, Feder S, Moher D, Kourad K, Gaboury I, Norris M, Ledoux S, Evaluation of the efficacy and safety of olanzapine as an adjunctive treatment for anorexia nervosa in adolescent females: a randomized, double-blind, placebo-controlled trial., BMC Pediatr, 2008, 8, 4, doi: 10.1186/1471-2431-8-4.

Additional files

Editorial Notes