no. take some skintastic with, and benedryl cream and afterbite just in case. but i was in san ignacio in june (second trip) and the bugs no big deal. i love it there. they were a bit worse on ac, but i understand baby oil works well, and off stuff is fine. no pills necessary, unless as said, you are in the jungle for 3+ months.
you will have a blast. take plenty of spf 15 or 30. it is expensive there. advil for the hangovers, and waterproof bandaids.and a brimmed hat, and...(c'mon klcman, i know it's killing you)...
LOTSA ZIPLOCS, LG & SMALL. just trust me, you'll use em!