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People with the syndrome experience uncomfortable sensations and strong urges to move their legs, which can be painful and disrupt sleep, according to Dr. William Ondo. He is director of the Movement Disorders Clinic at Houston Methodist Hospital.
Nearly 12 million people in the United States have restless legs syndrome, according to the American Sleep Association.
"Patients with restless legs syndrome already have difficulty sleeping as their symptoms tend to worsen at night or with rest, but sedating antihistamines ... can intensify the symptoms," Ondo said in a hospital news release.
"We don't yet understand why sedating antihistamines worsen restless legs syndrome, but we do know that non-sedating antihistamines do not affect the symptoms as much because they do not enter the brain as easily," he said.
"It's very frustrating for my patients when a sleeping pill like a sedating antihistamine doesn't help them sleep, so I advise them to seek other allergy relief options, such as nasal sprays and decongestants," he added.
-- Robert Preidt
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SOURCE: Houston Methodist Hospital, news release, April 4, 2016