Personally, I am not too familiar with it's use to treat candida, only familiar with it's use with cancer.
Cesium chloride should ALWAYS be taken with potassium - from day one!!! The potassium dose should only be increased if side effects are moderate, or severe and if this is accompanied by tests showing a potassium deficiency. Do not take cesium without potassium. For dosages, etc see websites like cancertutor.com
The point I was making by quoting Wikipedia is that Cesium chloride has a relatively low toxicity and that it's toxicity is mainly due to the fact that it causes a potassium deficiency which worsens with higher doses. Thus supplementing with potassium further reduces the already low toxicity of cesium chloride to the point were it is perfectly safe for cancer patients in moderate doses (if also taking potassium.) In healthy people, cesium is not necessary, or safe in these same amount and is only safe is smaller amounts (eg. small amounts of it is found in certain naturally alkaline mineral waters/rivers.)