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If you are pregnant or planning to get pregnant, avoid taking arsenic trioxide, as it may harm the fetus. Do not breastfeed while taking arsenic trioxide, as it may impart toxic effects via breast milk to the baby. Arsenic trioxide is a human‍​‍‍‍​‍‍‍‍‍‍‍‍​‍ carcinogen , so it is important to monitor yourself against the rise of any new cancer . Arsenic trioxide may lead to cardiac conduction abnormalities, so it is advised to maintain your mineral concentration as follows: Potassium: above 4 mEq/L Magnesium: above 1.8 mg/dL Consult your doctor before using arsenic trioxide with any other medications. If you have any pre-existing conditions such as kidney disease or heart disease, consult your doctor prior to taking this medication.