
Hi Marti,
WELCOME TO THE NEUROTALK FORUM COMMUNITY!
IVSM is used for a wide spectrum of reasons. With people with MS it is used to reduce the effects of a relapse or exacerbation, and to get you over that hump of bad symptoms as quickly as possible. With many people this effect lasts for up to two months. For others the positive effects only last a few weeks.
I wouldn't worry about taking a pulse of IVSM as long as the bad symptoms warrant it. You don't need to worry about it causing side effects with other medications.
Good luck and I hope you're feeling well soon.