"prazi also, is not good, since its carcinogenic, "
if this were known why are not the big books on tropical medicine saying anything about this?? some very recent research?
Or are you misunderstanding? People living in endemic areas of liver flukes and/or schisto are likely to use prazi from time to time, but they will still often get re-infected in endemic area (if not begin very careful, well depends on type of flukes there). It is well known from research that several flukes dramatically increase risk of several types of cancer (depending of type of flukes). Many people in endemic areas that have used prazi will therefore still get cancer, but where is the studies telling this is because the medicine, if no such study exist, then it is much more likely to think this is because they get re-infected, or treated too late (when flukes already have caused cancer).
There is many studies showing many flukes dramatically increase risk of cancer. But where are the studies showing praziquentel increase risk of cancer? If such studies exist, yes then they should naturally be taken very seriously, but I would like to see them