vasodialators

Hello doctor,
My friend has just been diagnosed with Raynauds disease. And so far it seems to me that the disease's main symptom is severe coldness in the extremities. I was wondering whether or not medications that act as vasodialators such as viagra would help this condition. I only mention Viagra as a reference to this type of medication. Im sure this is not the pertinent brand of medication that would be most effective but you see were im going.
Is using this type of medication even on the right track or is it simply overkill?
thankyou.
(I could'nt find a more specific specialty to ask this question but its a vascular question so i'm close)