Calcichew tablets should be taken just before, during or just after a meal. The tablets should be chewed or sucked and not swallowed whole. If Calcichew tablets are being taken as a calcium supplement (including for osteoporosis) then two or three tablets should be taken daily, preferably in divided doses, eg two in the morning and one in the evening. Follow the instructions given by your doctor or pharmacist. If you have kidney failure and are taking these tablets to prevent the absorption of phosphate, the dose will depend on your blood phosphate levels. Follow the instructions given by your doctor.