Synthox Levothyroxine Sodium Calcium Polystyrene Sulfonate
MajorTaking Calcium Polystyrene Sulfonate together with levothyroxine is not recommended. The leaflet lists levothyroxine among several other medicines that should not be used at the same time as this one, but it does not say what the problem is or how it happens.
These medicines can affect each other in a serious way. Do not start taking them together unless your doctor has said it is OK. If you already take both, do not stop either one on your own: speak to your doctor or pharmacist soon.