Low blood calcium 10%<unk>  solution (given intravenously) is the form of calcium most widely used in the treatment of low blood calcium. This form of calcium is not as well absorbed as calcium lactate, and it only contains 0.93% (930 mg/dl) calcium ion (defined by 1 g weight solute in 100 ml of solution to make 1% solution w/v). Therefore, if the hypocalcemia is acute and severe, calcium chloride is given instead. High blood potassium<unk>  is used as a cardioprotective agent in people with high blood potassium levels, with one alternative being the use of calcium chloride. It is recommended when the potassium levels are high (>6.5 mmol/l) or when the electrocardiogram (ECG) shows changes due to high blood potassium. Though it does not have an effect on potassium levels in the blood, it reduces the excitability of cardiomyocytes, thereby lowering the likelihood of cardiac arrhythmias. Magnesium sulfate overdose It is also used to counteract an overdose of Epsom salts magnesium sulfate, which is often administered to pregnant women in order to prophylactically prevent seizures (as in a patient experiencing preeclampsia). Magnesium sulfate is no longer given to pregnant women who are experiencing premature labor in order to slow or stop their contractions (other tocolytics are now used instead due to better efficacy and side effect profiles). Excess magnesium sulfate results in magnesium sulfate toxicity, which results in both respiratory depression and a loss of deep tendon reflexes (hyporeflexia). Hydrofluoric acid burns A tube of<unk>  gel Gel preparations of<unk>  are used to treat hydrofluoric acid burns. The<unk>  reacts with hydrofluoric acid to form insoluble, non-toxic calcium fluoride. In addition to a 2.5%<unk>  gel being applied directly to the chemical burn, the person may also receive<unk>  supplements because the fluoride ion precipitates serum calcium, causing hypocalcemia. Cardiac arrest While intravenous calcium has been used in cardiac arrest, its general use is not recommended. Cases of cardiac arrest in which it is still recommended include high blood potassium, low blood calcium such as may occur following blood transfusions, and calcium channel blocker overdose. There is the potential that general use could worsen outcomes. If calcium is used, calcium chloride is generally the recommended form.
Calcium gluconate
Sodium bicarbonate
Calcium chloride
Potassium chloride
Potassium chloride 
Magnesium sulfate
Magnesium sulfate 
Glucagon