I haven't been on any disease-modifying drugs before, and have only just been diagnosed. Following my second MRI my neuro wanted to put me on Tysabri because the disease was active. In fairness he understood completely when I had read the side effects and was unwilling to take it.
I have also considered Copaxone and BG12 but the side effects don't look great (more patient reports are starting to come out on BG12 - check out their Facebook page).
I decided to take LDN and have been taking it for a month. One question is whether you might want to consider taking LDN alone, rather than worrying about its compatibility, and considering another drug if it doesn't work?
There are some useful resources on LDN:https://www.facebook.com/groups/LDNRT/
(where patients share their experiences and get views from experts)
The website of the LDN Trust, which is championing it use: http://www.ldnresearchtrust.org/
In terms of other drugs, Laquinimod seems like it is finally just around the corner (Phase 3 trial in the UK has been completed), so worth keeping an eye out for.