ClinicalTrials.gg
TerminatedNCT03458416Updated Jun 22, 2023Results posted

A Study to Assess the Long-Term Safety of Pharmaceutical Grade Synthetic Cannabidiol Oral Solution in Participants With Prader-Willi Syndrome

A Phase 2 interventional study of Cannabidiol Oral Solution in Prader-Willi Syndrome, sponsored by Radius Pharmaceuticals, Inc.. Terminated at 1 site in United States. Open to participants aged 8 Years to 17 Years. Per ClinicalTrials.gov, last updated 2023-06-22.

Sponsored by Radius Pharmaceuticals, Inc. · Phase 2, Interventional, and Treatment

Why this study was terminated
Insys Therapeutics filed Chapter 11 and terminated all studies.
Phase
Phase 2
Study type
Interventional
Enrollment
2
Allocation
Not applicable
Ages
8 Years to 17 Years
Sex
All
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Study summary

The objective of this study is to assess the long-term safety and tolerability of Cannabidiol Oral Solution (CBD) in participants with Prader-Willi Syndrome.

02

Conditions studied

  • Prader-Willi Syndrome

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03

In context

Prader-Willi Syndrome

144 studies on the registry are indexed under Prader-Willi Syndrome; 23 are open to participants now.

This study's enrollment of 2 is below the median of 30 across 100 interventional studies indexed under Prader-Willi Syndrome.

Browse Prader-Willi Syndrome studies →

Lead sponsor

Radius Pharmaceuticals, Inc. is the lead sponsor of 9 studies on the registry; none are open to participants now.

Of its 7 completed or terminated interventional studies of FDA-regulated products, 7 (100%) have results posted.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
8 Years to 17 Years
Sexes eligible
All
Accepts healthy volunteers
No

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  1. Completed activities up to and including Visit 10 (Study Completion) of INS011-16- 085.
  2. Participant and/or parent(s)/caregiver(s) fully comprehend the form and assent form, understand all study procedures, and can communicate satisfactorily with the investigator and study coordinator, in accordance with applicable laws, regulations, and local requirements.
  3. If female, is either not of or practicing medically acceptable methods of .
  4. Psychotropic treatment will be permitted if the participant has been on a stable dose during the INS011-16-085 and does not anticipate a dose change during the course of the study.
  5. Growth hormone treatment will be permitted if the participant has been on a stable dose during INS01-16-085.
  6. Any other treatment including thyroid hormones should be stable prior to entering the INS011-17-115 study.
  7. In the opinion of the investigator, the parent(s)/caregiver(s) is (are) willing and able to comply with the study procedures and visit schedules, including venipuncture, and the visit schedules.

Exclusion criteria

Exclusion Criteria:

  1. Participant or parent(s)/caregiver(s) have commitments during the study duration that would interfere with attending all study visits.
  2. Experienced an anoxic episode related to study drug requiring resuscitation during the previous study.
  3. Uncontrolled Type I and Type II Diabetes.
  4. Developed an adverse event thought to be related to CBD in the previous study and the investigator determines that continuing treatment with CBD would not be in the best interest of the partient.
  5. History of gastrointestinal, renal, hepatic, neurologic, hematologic, endocrine, oncologic, pulmonary, immunologic, psychiatric, or cardiovascular disease, or other condition which would jeopardize safety or impact validity of results (per investigator).
  6. Currently taking felbamate.
  7. Compromised respiratory function or severe respiratory insufficiency.
  8. Pregnant or lactating female.
  9. In the opinion of the investigator, the participant is unsuitable in any other way to participate in this study.
Terms in these criteria, in plain language(4)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Informed consent

Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.

You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.

Childbearing potential

Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).

Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.

Contraception

Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.

Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.

Clinically significant

Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.

05

Study design

Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrollment
2 participants (actual)

Study arms

  • Experimental
    Cannabidiol Oral Solution: 20-40 mg/kg/day

    Participants will receive total daily doses between 20 milligrams per kilograms per day (mg/kg/day), 30 mg/kg/day, and 40 mg/kg/day. The two equivalent doses will be administered twice a day with a standard meal approximately every 12 hours.

    Drug: Cannabidiol Oral Solution

Interventions

06

What researchers measure

Primary outcomes

  1. Incidence Of Adverse Events (AEs) And Serious Adverse Events (SAEs) Associated With Cannabidiol Oral Solution

    AE is defined as any untoward medical occurrence in a participant administered with a pharmaceutical product which does not necessarily have a causal relationship with the treatment. An SAE is defined as any event that results in death, life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, or a congenital anomaly/birth defect. A summary of other non-serious AEs and all serious AEs regardless of causality, is located in the Reported AE section.

    Time frame: Up to Week 52

07

Results

Posted Jun 22, 2023
Limitations and caveats
This study was terminated by the Sponsor. The Sponsor terminated the study due to slow enrollment and a failure to identify adequate participants that met eligibility criteria. Due to study termination and only 2 participants being enrolled there are concerns regarding participant confidentiality, therefore no data are being reported.

Participant flow

This study was terminated by the Sponsor. The Sponsor terminated the study due to slow enrollment and a failure to identify adequate participants that met eligibility criteria. Due to study termination and only 2 participants being enrolled there are concerns regarding participant confidentiality, therefore no data are being reported.

Participant flow — Overall Study
MilestoneCannabidiol Oral Solution
Started0
Completed0
Not completed0

Outcome measures

PrimaryIncidence Of Adverse Events (AEs) And Serious Adverse Events (SAEs) Associated With Cannabidiol Oral Solution

AE is defined as any untoward medical occurrence in a participant administered with a pharmaceutical product which does not necessarily have a causal relationship with the treatment. An SAE is defined as any event that results in death, life-threatening, requires inpatient hospitalization or prolongation of existing hospitalization, results in persistent or significant disability/incapacity, or a congenital anomaly/birth defect. A summary of other non-serious AEs and all serious AEs regardless of causality, is located in the Reported AE section.

Time frame:
Up to Week 52

No measurements were reported for this outcome.

Adverse events

Collected over Up to 52 Weeks. Non-serious events are listed at a 0% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Cannabidiol Oral Solution———

Baseline characteristics

This study was terminated by the Sponsor. The Sponsor terminated the study due to slow enrollment and a failure to identify adequate participants that met eligibility criteria. Due to study termination and only 2 participants being enrolled there are concerns regarding participant confidentiality, therefore no data are being reported.

Age, Continuous
Age, ContinuousCannabidiol Oral Solution
Sex: Female, Male
Sex: Female, MaleCannabidiol Oral Solution
Female—
Male—
Ethnicity (NIH/OMB)
Ethnicity (NIH/OMB)Cannabidiol Oral Solution
Hispanic or Latino—
Not Hispanic or Latino—
Unknown or Not Reported—
08

Study locations

1 site
  • Institute for Research and Innovation | MultiCare Health System
    Tacoma, Washington 98405, United States
09

References and documents

Study documents

PDFs hosted by the registry, ClinicalTrials.gov.

10

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jun 22, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
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Registry details

Key details

Study ID
NCT03458416
Lead sponsor
Radius Pharmaceuticals, Inc.
Collaborators
Benuvia Therapeutics Inc.
Responsible party
Sponsor
First posted
Mar 8, 2018
Start date
Sep 6, 2018
Primary completion
Jul 31, 2019
Completion
Jul 31, 2019
Results posted
Jun 22, 2023
Last update
Jun 22, 2023

Study contacts

Ahmed Elkashef, MD
study director · INSYS Therapeutics Inc

Oversight

Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is terminated, as verified in May 2023. You cannot join it, but the record below documents what was studied.

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