Clonazepam does not typically cause restless leg syndrome (RLS). It is actually one of the medications prescribed to treat it. However, the relationship between clonazepam and RLS is more nuanced than a simple yes or no, because tolerance can develop within weeks, certain side effects can mimic RLS-like sensations, and other medications you may be taking alongside clonazepam are well-known RLS triggers.
Clonazepam Is Used to Treat RLS, Not Cause It
Clonazepam works by boosting a calming brain chemical called GABA, which helps relax muscles and reduce the urge to move your legs. The NHS lists restless legs syndrome as one of the conditions clonazepam is sometimes prescribed for. It has been used for this purpose since the late 1970s, when early studies found it reduced RLS symptoms and improved sleep quality at doses around 1 mg taken before bedtime.
That said, clonazepam is not FDA-approved for RLS. The only FDA-approved medications for the condition are certain dopamine-related drugs and one form of gabapentin. Clonazepam is considered a second-line, off-label option, typically at doses between 0.1 and 1 mg. Clinical guidelines from the RLS Foundation’s advisory board note that long-acting benzodiazepines like clonazepam “should generally be avoided” as a first choice because of side effects like nighttime unsteadiness and morning drowsiness, though they remain an option when other treatments fail or aren’t suitable.
Tolerance Can Make It Seem Like RLS Is Getting Worse
One of the most common reasons people on clonazepam feel their RLS is worsening is tolerance. Your body adjusts to the drug, and it stops working as well as it did initially. This typically happens within 4 to 12 weeks. When that relief fades, the return of your original symptoms can feel like the medication is making things worse, even though what you’re experiencing is simply the underlying condition breaking through again.
Importantly, clonazepam does not appear to cause augmentation, which is a phenomenon where treatment actually makes the disease worse than it was before you started. Augmentation is primarily a problem with dopamine-based RLS medications, where symptoms start appearing earlier in the day or spreading to new parts of the body. In documented cases, tolerance developed with all types of RLS drugs, but augmentation occurred only with the dopamine-related ones. So while clonazepam may stop helping, it is unlikely to leave you worse off than your baseline.
Side Effects That Mimic Restless Legs
Clonazepam has several nervous system side effects that could be confused with RLS symptoms. Up to 30% of users experience ataxia (poor coordination), and shakiness, trembling, unsteady gait, and problems with muscle control are listed among common side effects. In rare cases, involuntary choreiform movements (jerky, dance-like motions) have been reported after long-term use. Higher doses of 3 to 4 mg have caused confusion and excessive sedation.
These effects are distinct from true RLS, but if you’re experiencing new leg discomfort or involuntary movements while on clonazepam, it’s worth understanding the difference. RLS produces an uncomfortable crawling or pulling sensation deep in the legs that creates an irresistible urge to move them. It gets worse in the evening and during rest, and moving your legs provides temporary relief. Clonazepam side effects like tremor or coordination problems, by contrast, tend to be present throughout the day and don’t follow that pattern of worsening at rest and improving with movement.
Other Medications Are More Likely Culprits
If you’re taking clonazepam and noticing new or worsening RLS symptoms, one of your other medications may be the real cause. A large analysis of FDA adverse event reports from 2004 to 2024 identified several drug classes that significantly increase the risk of developing RLS.
Antidepressants are among the most common triggers. SSRIs like fluoxetine, citalopram, and sertraline, along with SNRIs like venlafaxine and duloxetine, and mirtazapine all showed up as validated risk signals. Antipsychotics, including quetiapine, aripiprazole, and lurasidone, are another major category. Since clonazepam is often prescribed alongside these drugs for anxiety or mood disorders, it’s easy to blame the wrong medication.
Over-the-counter antihistamines deserve special attention. Diphenhydramine, the active ingredient in many sleep aids and cold medications, was strongly associated with RLS. One study found antihistamines increased the odds of an RLS diagnosis by roughly 60 times compared to non-users. If you’re taking an OTC sleep aid or allergy medication containing diphenhydramine or doxylamine, that could easily explain new leg symptoms.
RLS vs. Akathisia: A Key Distinction
If you’re on psychiatric medications along with clonazepam, it’s also worth knowing the difference between RLS and akathisia, a drug-induced restlessness that can look similar on the surface. Akathisia is an inner sense of agitation that affects your whole body. People with akathisia tend to rock back and forth, shift their weight between feet, or feel unable to sit still in a generalized way. RLS, on the other hand, produces localized sensations in the legs, peaks in the evening, disrupts sleep, and is not tied to antipsychotic or other neuroleptic use.
This distinction matters because the treatments are different. If what you’re experiencing is actually akathisia from another medication, adjusting or stopping clonazepam won’t help. Identifying the right source of the problem leads to the right solution.
What to Watch For
If your RLS symptoms are returning or worsening while you’re on clonazepam, the most likely explanations are tolerance to the drug, a new medication triggering RLS, or an OTC product like an antihistamine-based sleep aid. True drug-induced RLS from clonazepam itself is not a recognized pattern in the medical literature. Review any medications you’ve recently started or changed, including over-the-counter ones, as these are far more likely to be the source of the problem.