In this post… Why does low Mg cause low K? Distal Na and K transport and the transepithelial voltage Hypomagnesaemia: easy to find if you go looking for it; usually left well alone. (And often caused by a drug.) But sometimes hypomagnesaemia is worth paying attention to if it is contributing to another electrolyte disorder such as hypocalcaemia or hypokalaemia. Any medical student can tell you that Mg deficiency can cause refractory hypokalaemia.

In this post… PPIs are associated with hypomagnesaemia PPIs reduce intestinal Mg2+ absorption diuretics, CNIs and anti-cancer agents promote renal Mg2+ loss PPIs and Mg We had a referral recently for a case of persistent hypomagnesaemia “? cause”. As is often the case, the patient had been taking a PPI for some years. There was no obvious alternative explanation and FEMg was low - so we blamed this as the likely culprit.