You will need a 6 month washout period so the one old drug can get completely out of your body before you start the new medicine. Discuss the medicine change and listen to his advice. Also I will say if you're not happy with one neurologist you have the right to change neurologists till you find one that you can trust and do the treatment he suggest. Never stop any medicine without first consulting your dr.

Yes that's true...but was also told that the patent on Rituximab was running out making it cheaper,,,,but don't know how much it is/will be ?

Its not covered by our pbs coz its not a ms treatment (so they say)

I was told 3 months wash out plus Rituximab is very much like Tysabri....but check first with your Neuro