Let's get the negatives out of the way first. We are all different and meds re-act differently to each individual. OK? Amen.
I had RLS for 7 months last year. In the end I went to my neuro (I have Parkinson's) and he prescribed mirapexin (mirapex in US).
It works great for ME. He increased the dosage which did not suit me but I empowered myself to regulate the meds to suit me and it works just fine now
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There are known POSSIBLE side affecs like hyper sexual activity (I should be so lucky), excessive gambling and largess money spending especially on credit cards so you must be aware of this.
If you feel that this is happening call your GP or consultant straight away so that they can advise you on how to reduce/come off the med. DO NOT STOP TAKING THE MEDS if you have been on for more than a few days as this can lead to major side effects.
Like all medication it will not suit everyone but if you have tried other meds and they do not work, well, it's not as if you are going to lose a nights' sleep over it as you are already there.
I wish you all a peaceful Easter.