arthritis in hands-is there anything I can try?

My sister has ostoarthritis in one hand. I asked her what she used and here is her reply:

flanz
The cream is Voltaren. When we were in Canada it was only available by brand name, prescription (expensive). Since then a generic form is available, Diclorenac Sodium Topical Gel. Still need a prescription but it is MUCH less expensive. In the US a prescription is required, it is OTC in Canada and Mexico.