the protozoa site http://www.badbugs.com
has some information regarding drugs, check it out.
my advice is that you first try the salt protocol with 15g (1/2 oz) of salt divided in 4 doses per day by buying empty capsules from ebay, the cost is minimal, the side effects are nothing compared to drugs, and its much faster cure it only takes 3 days to rid you of all protozoa parasites.