Anti-malarial drugs and Ulcerative Colitis

My husband and I are taking a trip to India in December, and malaria is endemic to India (it's not as bad as Africa, but the possibility of malarial infection exists, even if you take every precaution such as mosquito repellents, insect repellent sprays etc). So, we've been trying to decide if taking anti-malarial drugs can cause a flare up of his ulcerative proctitis - and make an educated decision on whether or not he should take anti-malarial drugs.

I've ruled out the following anti-malarial drugs:
* chloroquine - doesn't work in India - there are chloroquine resistant malarial strains in India
* Larium (mefloquine) - very serious side effects, including permanent ones, including depression and suicide. So, this is out.
* doxycycline - with UC, he should not take antibiotics daily, if at all avoidable. We'll just be flirting with a flare then, probably.

So, that leaves only one other anti-malarial med:
* Malarone (atovaquone/proguanil) - there are no specific warnings for Ulcerative colitis patients, but one of the common side-effects is abdominal pain and diarrhea. I'm going to talk to his GI before we leave, to see what his recommendation is, but it's probable that he doesn't have any more information than I do regarding this matter. What do you guys think? Take this med despite the 5% chance of stomach upset and pain, or take a chance with malaria (it should be fairly small in the winter)?

Have any of you had to take malarone? If so, what were your side effects? Did it affect your UC at all?

Any advice / insight will be appreciated.

Thanks,
PV