Hi All- Here is a great thread about how high dosing magnesium can lower blood pressure. If sodium and potassium levels are low than there is a greater chance of having low blood pressure. Magnesium can lower blood pressure even more. Read the whole thread including Rick Malter's. This is exactly what was happening to me when I was taking very high dosages.
More is not always better! I now stay between 500 and 600 per day!