I am not sure about anti-malarial drugs, but my husband and I traveled to India during the monsoon season, and mosquitoes are a big problem, and malaria is endemic to India as well. We considered it, but we didn't put him on any anti-malarial medication. We got a good treated mosquito net, and ultrathon (a long acting mosquito repellent), and that did do the trick. However, we were staying at my parents house which is sprayed for mosquitoes and the neighborhood is also sprayed weekly, so we knew our risk was small.
The mosquito netting is a good idea though. If you are going to a place endemic with mosquitoes, good netting, treated with anti-malarial stuff is a must I think.
Husband with Crohn's
Diagnosed March 2003 Ulcerative Proctitis
Diagnosed March 2008 Crohn's & C-diff, hospitalized 45 days
Crohn's in Remission since June 2008
C-diff recurrence Sep 2009
Reactive Arthritis Nov 2009
Currently c-diff free
Osteopenia of spine (Mar 2010)
Canasa (1gm), Lialda (4.8 gms), Remicade (8 weeks)
Currently In Remission