I’ve used demal 200 working on a overlandtruck for myself for 4 months, and sofar it works good. I use to have malaria 2-3 times a season. I am a lot in malawi, zambia and the coast of tanzania. When I was in Malawi – rainseason – one time I got a small malaria attack (I took too small dosis) but after 3 sprays and 15 minutes it was gone allready.