Hello Hetrazan is diethylcarbamazine and is used W.bancrofti , filaria and also in EOSINOPHILIA ( as in your daughter case ) . This is most effective and safe medicine for eosinophilia whether parasites present or not present. Usually very minor side effects are present that too not dangerous if , even taken for long time . Safe in children also . Doses are day1 1 mg / kg in three divided doses . Increase up to 6 mg /kg body weight in three divided doses . So you can give this drug to your daughter irrespective of parasitic presence . Hope this will be useful for you. Good luck.