Other sleep medicine

Once you've ruled out underlying causes then medications used to treat restless leg syndrome include carbidopa-levodopa, opioids (such as propoxyphene) or tramadol (Ultram) for intermittent symptoms, carbamazepine, clonazepam, diazepam, triazolam, temazepam, baclofen, bromocriptine, and clonidine. Also, recently, gabapentin (Neurontin) has been found helpful. The FDA has now approved ropinirole (Requip) and pramipexole (Mirapex) for the treatment of restless leg syndrome. Other treatments that have been helpful for some patients include avoiding caffeine, warm/cold baths, electric nerve stimulation, oral magnesium, and acupuncture.(sourced from Medicinenet.com)

Cymbalta is not approved for the treatment of either sleep or restless leg syndrome.It is most commonly used to treat depression or nerve pain caused by diabetes. You can read more about Cymbalta by clicking here. 

Best of luck,

Casey