Is magnesium oxide used for restless leg syndrome?

This taken from http://www.drugs.com/enc/restless-leg-syndrome.html
"... There is no known cure for restless leg syndrome.

Treatment is aimed at reducing stress and helping the muscles relax. Warm baths, gentle stretching exercises, massage or similar techniques may help.

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Low doses of pramipexole or ropinirole (Requip) have been found to be very effective in controlling symptoms in some people. If sleep is severely disrupted, medications such as Sinemet (an anti-Parkinson's medication), gabapentin and pregabalin, or tranquilizers such as clonazepam may be prescribed, but they may cause daytime sleepiness.
Patients with iron deficiency will receive iron supplements.
Low doses of narcotics may sometimes relieve symptoms of restless leg syndrome."
See also http://www.ninds.nih.gov/disorders/restless_legs/detail_restless_legs.htm
Magnesium supplements may be useful in RLS .