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AVP-923-30 for Multiple Sclerosis (PRIME Trial)

Phase 2
Waitlist Available
Research Sponsored by Avanir Pharmaceuticals
Eligibility Criteria Checklist
Specific guidelines that determine who can or cannot participate in a clinical trial
Must have
Be older than 18 years old
Timeline
Screening 3 weeks
Treatment Varies
Follow Up baseline; days 57 through 84 (prs score); days 22 and 50 (dextromethorphan plasma concentrations)
Awards & highlights
All Individual Drugs Already Approved
Approved for 5 Other Conditions

Summary

The objectives of the study are to evaluate the safety, tolerability, and efficacy of 3 doses of AVP-923 capsules in the treatment of central neuropathic pain in participants with multiple sclerosis.

Eligible Conditions
  • Multiple Sclerosis
  • Central Neuropathic Pain

Timeline

Screening ~ 3 weeks
Treatment ~ Varies
Follow Up ~baseline; days 57 through 84 (prs score); days 22 and 50 (dextromethorphan plasma concentrations)
This trial's timeline: 3 weeks for screening, Varies for treatment, and baseline; days 57 through 84 (prs score); days 22 and 50 (dextromethorphan plasma concentrations) for reporting.

Treatment Details

Study Objectives

Study objectives can provide a clearer picture of what you can expect from a treatment.
Primary study objectives
Association Between the Dextromethorphan Plasma Concentration and the Change From Baseline Pain Rating Scale (PRS) Score to the Average Pain Rating Scale Score During Days 57 Through 84
Average Logarithms of Dextromethorphan (DM) Plasma Concentrations (Cmax) on Days 22 and 50
Secondary study objectives
Comparison of the Adjusted Mean Change From Baseline PRS Score to the Average PRS Score During Days 57 Through 84
Mental Depression
Mean Change From Baseline in Expanded Disability Status Scale (EDSS) Scores at Days 22 and 85
+7 more
Other study objectives
Change From Baseline in Modified Ashworth Scale (MAS) Scores

Awards & Highlights

All Individual Drugs Already Approved
Therapies where all constituent drugs have already been approved are likely to have better-understood side effect profiles.
Approved for 5 Other Conditions
This treatment demonstrated efficacy for 5 other conditions.

Trial Design

4Treatment groups
Experimental Treatment
Placebo Group
Group I: AVP-923-45Experimental Treatment1 Intervention
Group II: AVP-923-30Experimental Treatment1 Intervention
Group III: AVP-923-20Experimental Treatment1 Intervention
Group IV: PlaceboPlacebo Group1 Intervention
Treatment
First Studied
Drug Approval Stage
How many patients have taken this drug
Dextromethorphan
FDA approved
AVP-923-45
2011
Completed Phase 2
~230
AVP-923-30
2012
Completed Phase 2
~430

Find a Location

Who is running the clinical trial?

Avanir PharmaceuticalsLead Sponsor
31 Previous Clinical Trials
12,989 Total Patients Enrolled
2 Trials studying Multiple Sclerosis
5,386 Patients Enrolled for Multiple Sclerosis
~15 spots leftby Nov 2025