Muscle Relaxants in Cervical Radiculopathy
Centrally acting muscle relaxants can be used as part of nonoperative management for cervical radiculopathy, particularly in the acute phase when muscle spasm is present, though evidence for their specific efficacy is limited and they should be prescribed cautiously given their side effect profile.
When to Use Muscle Relaxants
Clinical Context
- Cervical radiculopathy is frequently self-limiting, with 75-90% of patients achieving symptomatic relief with nonoperative conservative therapy 1
- Most cases resolve regardless of treatment type, making reassurance an important component of management 2
- Muscle relaxants are most appropriate when painful neck movements and muscle spasm are prominent examination findings 2
Timing in Treatment Algorithm
- Acute phase: Consider muscle relaxants as part of initial multimodal management when muscle spasm is a significant component 2
- Use for a short period only - not intended for prolonged therapy 3
- Should be combined with other modalities including NSAIDs, physical therapy, and patient education 2, 3
How to Use Muscle Relaxants
Prescription Approach
- Prescribe as an adjunct to other treatments, not as monotherapy 2, 3
- Use the lowest effective dose to minimize side effects 4
- Limit duration to avoid dose-limiting adverse effects including sedation, ataxia, and impairment of voluntary motor function 4, 5
Multimodal Integration
The focus should shift based on stage of recovery 6:
- Acute stage: Muscle relaxants combined with patient education, spinal manipulative therapy, specific foraminal opening exercises, and sustained pain-relieving positions 6
- Subacute stage: Transition away from passive interventions like muscle relaxants toward individualized physical activity, motor control exercises, and neurodynamic mobilization 6
- Chronic stage: Discontinue muscle relaxants; focus on general aerobic exercise and strength training 6
Important Caveats
Limited Evidence Base
- There is little high-quality evidence on the best nonoperative therapy for cervical radiculopathy, including muscle relaxants 3
- The effectiveness of individual treatments including muscle relaxants remains controversial 3
- Best evidence for centrally acting skeletal muscle relaxants exists for acute, nonoperative musculoskeletal pain rather than specifically for radiculopathy 4
Side Effect Considerations
- Risk of complications and side effects should prompt careful consideration of individual patient circumstances 4
- Common adverse effects include sedation, dizziness, and impaired motor coordination 5
- Safety ratios (side effect threshold/therapeutic effect threshold) vary widely among different muscle relaxant agents 5
Red Flags for Reassessment
If symptoms persist after 4-6 weeks of conservative treatment including muscle relaxants, consider MRI to identify pathology amenable to epidural steroid injections or surgery 2