Study found that the blood of chickens given the drug contained low levels of a ##xin . Suspension does not kick in for 30 days . The FDA 's study was carried out after other studies indicated that organic arsenic could transform into the more dangerous inorganic form , the FDA said . Pfizer says that delay will give time for producers to transition to other marketing strategies , according to the FDA .
Study found that the blood of chickens given the drug contained low levels of a ##xin . Suspension does not kick in for 30 days . Pfizer says that delay will give time for producers to transition to other marketing strategies , according to the FDA .