Restless Legs in Kidney Disease: Causes & Treatment

The kidney-iron connection

The clearest mechanism in kidney disease: RLS is driven by brain iron deficiency, and CKD patients are iron-starved — from blood loss, poor absorption, and hepcidin trapping iron in storage. Restless legs is one of the most treatable complications of the iron deficiency that dialysis care already tracks.

RLS prevalence in dialysis is 2-3× the general population — and it's associated with worse sleep, depression, and even higher mortality in some cohorts. It's a real complication, not a quirk.

Treatment in order

Step 1: iron. Measure ferritin and transferrin saturation; in dialysis patients this usually means IV iron to get transferrin saturation to target — and RLS frequently improves as iron repletes. Step 2: medications — gabapentin or pregabalin at renal-adjusted doses are now favored first-line (effective, fewer side effects); dopamine agonists (ropinirole, pramipexole) are an alternative but carry augmentation risk with long-term use.

Step 3: trim the aggravators — caffeine and alcohol in the evening, and medications that worsen RLS (some antihistamines, SSRIs, antipsychotics). Dialysis timing and adequacy also play a role; some patients feel symptoms most on dialysis days.

Screening

One question finds most cases: 'When you sit or lie down to rest, do you get an urge to move your legs that's hard to resist?' If yes — with worsening at night and relief with movement — the RLS diagnosis is essentially clinical. The tragedy is how often it's never asked; the treatment gap is large and treatable.