Muscle relaxers are not a standard treatment for rheumatoid arthritis, and the clinical evidence supporting their use is surprisingly thin. A Cochrane systematic review found that common muscle relaxants, including benzodiazepines like diazepam and non-benzodiazepine options, do not appear to significantly reduce RA pain. That said, they are sometimes prescribed as add-on medications for specific secondary symptoms like muscle spasms, poor sleep, and the widespread pain that develops when RA goes undertreated or overlaps with conditions like fibromyalgia.
What Muscle Relaxers Actually Do
Muscle relaxers don’t treat the underlying problem in rheumatoid arthritis, which is an overactive immune system attacking joint tissue. Instead, they work on the nervous system and muscles themselves. There are two broad categories. Antispasmodic drugs reduce muscle spasms by calming nerve signals in the spinal cord and brain. Antispasticity drugs like baclofen and dantrolene work differently: baclofen slows nerve transmission at the spinal level, while dantrolene acts directly on muscle fibers to reduce contraction strength.
Any pain relief from these drugs is likely indirect. Their modest painkilling effect probably comes from sedation and from dampening the nerve signals that carry pain. Some lab research has shown that certain receptors targeted by benzodiazepines play a role in regulating immune responses and may have anti-inflammatory properties, but this hasn’t translated into meaningful clinical benefits for RA patients in trials.
What the Evidence Shows
The most thorough look at this question comes from a Cochrane review published in The Journal of Rheumatology, which examined muscle relaxants specifically for inflammatory arthritis. The findings were discouraging for anyone hoping these drugs would help with RA pain. Benzodiazepines like diazepam and triazolam did not improve pain at either 24 hours or one week. The non-benzodiazepine sleep aid zopiclone also failed to significantly reduce pain over two weeks.
Despite this lack of evidence, muscle relaxants have gained widespread clinical acceptance as add-on treatments for chronic musculoskeletal pain. Doctors prescribe them frequently, even though the data doesn’t strongly support the practice in RA specifically. The gap between how often these drugs are used and how well they’ve been proven to work is notable.
Where They Might Still Help
RA pain doesn’t stay simple over time. As the disease progresses, the sources of pain multiply. Joint inflammation leads to guarding and tension in surrounding muscles. Poor sleep becomes chronic. Anxiety and depression compound the physical symptoms. Muscle spasms develop around damaged joints. For patients dealing with this full picture, a muscle relaxer can sometimes ease the secondary layers of discomfort even if it does nothing for the joint inflammation itself.
The strongest case for muscle relaxers in this context involves patients who also have fibromyalgia, which commonly overlaps with RA. In a double-blind trial comparing cyclobenzaprine (a non-benzodiazepine muscle relaxer) to placebo in fibromyalgia patients, those taking cyclobenzaprine experienced significantly less pain, better sleep quality, and fewer tender points. Only 16% of the cyclobenzaprine group dropped out due to the drug not working, compared to 52% of the placebo group. Notably, morning stiffness did not improve, and fatigue showed only a trend toward improvement rather than a clear benefit.
This means if your RA is accompanied by widespread muscle tenderness, tightness, and disrupted sleep, a muscle relaxer might offer some relief for those particular symptoms. But it won’t touch the joint inflammation driving RA itself.
Risks of Long-Term Use
Muscle relaxers carry real downsides, especially with ongoing use. Sedation is the most common side effect and can impair driving, concentration, and balance. For older adults, this drowsiness increases fall risk. Benzodiazepines in particular carry a well-documented risk of physical dependence, meaning your body adapts to the drug and stopping it abruptly can cause withdrawal symptoms. Even non-benzodiazepine options like cyclobenzaprine cause significant drowsiness and dry mouth.
Most RA patients are already taking disease-modifying drugs, anti-inflammatory medications, or both. Adding a muscle relaxer introduces another medication to manage, with potential for interactions that add sedation or affect how other drugs are processed. The sedative effects of muscle relaxers can also stack with other medications that cause drowsiness, including certain antidepressants and pain relievers commonly used alongside RA treatments.
The Role of Magnesium
Some people look to magnesium as a natural alternative to pharmaceutical muscle relaxers, and there’s an interesting connection to RA worth understanding. Magnesium plays a regulatory role in the inflammatory pathways closely tied to RA, including the production of inflammatory signaling molecules. It also appears to have protective effects on cartilage by supporting the health of the cells that maintain joint tissue. Magnesium supplementation has been shown in some randomized controlled trials to reduce C-reactive protein, a key marker of inflammation.
A cross-sectional study of US women found that when dietary magnesium intake was below 181 mg per day, increasing magnesium intake was associated with lower rates of RA. The relationship isn’t straightforward, though. Very high intakes (above roughly 446 mg per day) were actually associated with increased RA prevalence, with odds nearly tripling. This U-shaped pattern suggests that moderate magnesium intake may be beneficial, but more is not necessarily better. Meeting the recommended daily amount through food sources like leafy greens, nuts, seeds, and whole grains is a reasonable approach, but megadosing isn’t supported by the data.
What Works Better for RA Pain
The core treatment for RA targets the immune system dysfunction driving the disease. Disease-modifying medications slow or stop the immune attack on joints, and when they work well, pain, stiffness, and swelling all improve because the source of inflammation is being controlled. This is fundamentally different from what a muscle relaxer does, which is mask symptoms without addressing the cause.
For the muscle tension and stiffness that accompany RA, physical therapy and regular gentle movement often provide more sustainable relief than medication. Stretching tight muscles around inflamed joints, strengthening the muscles that support those joints, and maintaining range of motion all reduce the secondary muscle pain that makes people reach for a muscle relaxer in the first place. Heat therapy before activity and cold therapy after flares can also ease muscle tightness without the sedation or dependency concerns that come with medication.
If sleep disruption is the main issue driving your interest in muscle relaxers, that’s worth addressing directly. RA-related sleep problems often improve when joint inflammation is better controlled, but cognitive behavioral approaches to insomnia and good sleep habits can also help without adding another medication to the mix.