Abstract : Because symptoms associated with hypomagnesia are highly aspecific, this ionic abnormality is rarely searched for although it could be present in as much as 20% of the population. The mode of correction (oral or intravenous) depends on the etiology, severity and clinical consequences of hypomagnesemia. Significant hypermagnesemia only occurs in the presence of renal insufficiency and/or acute excess administration, mainly by the intravenous route. If interruption of administration does not suffice, renal dialysis might become necessary to quickly correct the magnesemium serum levels