Apologies if I'm teaching you to suck eggs, but your choice of drug should depend on your itenary and level of risk. I'd suggest taking expert advice from a travel clinic, as some drugs may be contra-indicated in pilots.
Here's what my (dated) text books suggest- you can ring the manufacturers to clarify.
Chloroquine- up to 5ys
Proguanil- indefinitely
Mefloquine- licensed in th uk for 3m, but can be used for up to 1 yr
Doxycycline- 3m, long term effects unknown
Malarone- don't have the info. (mefloquine is proguanil+atovaquone).
The evidence surrounding these is pretty scant, so you may find expert opinion differs, although if you could be more specific, I'm sure that you may be able to elicit more expert opinion. :-)
Last edited by gingernut; 8th Sep 2006 at 20:29.
Reason: guidance in the right direction