Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

Study to Evaluate Two Formulations of Carisoprodol in Subjects With Musculoskeletal Spasm of the Lower Back

This study has been completed.
Information provided by (Responsible Party):
Meda Pharmaceuticals Identifier:
First received: May 1, 2008
Last updated: October 22, 2012
Last verified: October 2012
The purpose of this study is to determine if two sustained released formulations of carisoprodol are more effective than placebo.

Condition Intervention Phase
Lower Back Pain
Drug: Carisoprodol SR 700 mg
Drug: Carisoprodol SR 500 mg
Drug: Placebo
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Randomized, Double-Blind, Double-Dummy Trial of Two Sustained Release Formulations of Carisoprodol Compared to Placebo in Subjects With Acute, Painful, Musculoskeletal Spasm of the Lower Back

Resource links provided by NLM:

Further study details as provided by Meda Pharmaceuticals:

Primary Outcome Measures:
  • Subject Rated Change Relief From Starting Backache of Pain on a 100-point Visual Analog Scale [ Time Frame: baseline to 14 days ]
    on a visual analog scale of 0 to 100 millimeters(mm) with 0 being no pain and 100 being maximum pain By measuring the amount of pain before and during treatment done at each visit and recording the difference in mm.During treatment scores were averaged and this average was compared to the baseline value.

Secondary Outcome Measures:
  • Subject Functional Assessment Based on the Roland-Morris Disability Questionnaire (RMDQ) [ Time Frame: baseline and day +14 ]
    Subject functional assessment based on the Roland-Morris Disability Questionnaire (RMDQ)at day 14.Subjects were asked to read a list of 24 sentences that people have used to describe themselves when they had back pain, and were asked to mark those statements that described their condition that day. The number of marked statements was added. A decrease in the number of marked statements from baseline represented improvement on the RMDQ.

Enrollment: 830
Study Start Date: April 2008
Study Completion Date: March 2009
Primary Completion Date: March 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Carisprodol SR 700 mg
Carisoprodol 700 mg twice daily
Drug: Carisoprodol SR 700 mg
700 mg twice daily tablet
Other Name: no other name
Experimental: Carisoprodol SR 500mg
Carisoprodol SR 500 mg twice daily
Drug: Carisoprodol SR 500 mg
carisoprodol SR 500 mg tablet
Other Name: no other name
Placebo Comparator: Placebo
Drug: Placebo
placebo tablet
Other Name: no other name

Detailed Description:


This will be a randomized, double-blind, double-dummy, placebo-controlled, parallel-group study in subjects 18-70 years of age with acute, painful, muscle spasm of the lower back. The study consists of a baseline screening (Study Day 1), during which subjects will be evaluated for inclusion/exclusion criteria, and a 7-day double-blind treatment period (Study Day 1 through Study Day 7). Subjects will be randomly assigned to be dosed twice daily with one of the following double-blind treatments: SR carisoprodol 500-mg tablets, SR carisoprodol 700-mg tablets, or placebo.

Subjects will be evaluated in the clinic on Study Days 1, 3 and 7. Subjects who remain symptomatic on Study Day 7 will be allowed to continue in the study for a 7-day, double-blind extension period at the discretion of the Investigator. Subjects will be contacted by telephone for a safety follow-up 7 days after the last dose of study medication.

A pharmacokinetic (PK) substudy will be conducted at selected sites. These sites will obtain blood samples for PK analysis at the end of the 7-day treatment period and the 14-day treatment period, if applicable.


Ages Eligible for Study:   18 Years to 70 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Onset of pain is within 3 days of first visit
  • Subject rating of pain must be 40 mm or greater on VAS
  • Ability to discontinue all analgesics, NSAIDs, and other muscle relaxants
  • Willingness to provide written informed consent
  • Must be in generally good health

Exclusion Criteria:

  • Presence of sciatic pain
  • History of clinically significant spine pathology such as herniated nucleus pulpous, spondylolisthesis, spinal stenosis
  • Presence of underlying chronic back pain
  • Neurological signs and symptoms such as numbness, tingling, foot drop, paresthesia, unexplained constipation, urinary retention or urinary incontinence
  • Myocardial infarction within one year of study
  • Cancer not in remission or in remission less than one year
  • HIV or other immunodeficiency syndromes
  • History of osteoporosis or at high risk for vertebral fracture
  • Underlying rheumatologic disease such as rheumatoid arthritis, ankylosing spondylitis, etc.
  • Presence of active influenza or other viral syndromes
  • Morbid obesity (BMI >39)
  • Evidence of infection, such as low grade fever or neutrophilia
  • Existence of any medical/surgical condition that could interfere with the evaluation of the study medication
  • Known history of alcohol or drug abuse
  • Injury involving high potential for litigation, including worker's compensation or automobile accidents
  • Pregnancy or breast feeding
  • Women of child-bearing potential not abstinent or not practicing a medically acceptable method of contraception
  • Vertebral body or spinous process, percussive tenderness on physical exam
  • Any abnormalities in the following tests of both lower extremities: ankle dorsiflexion strength, great toe dorsiflexion strength, absent or hyperreflexic Achilles or patellar tendor reflexes, abnormal sensory exam in the medial, dorsal or lateral aspect of the foot and positive straight leg raise test
  • Urgent medical conditions on comprehensive exam that might indicate a more serious condition should be treated urgently
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00671879

  Show 73 Study Locations
Sponsors and Collaborators
Meda Pharmaceuticals
Study Director: Lewis M. Fredane, MD Meda Pharmaceuticals
  More Information

Responsible Party: Meda Pharmaceuticals Identifier: NCT00671879     History of Changes
Other Study ID Numbers: MP511
Study First Received: May 1, 2008
Results First Received: July 13, 2011
Last Updated: October 22, 2012

Additional relevant MeSH terms:
Back Pain
Low Back Pain
Neurologic Manifestations
Nervous System Diseases
Signs and Symptoms
Muscle Relaxants, Central
Physiological Effects of Drugs
Neuromuscular Agents
Peripheral Nervous System Agents processed this record on April 21, 2017