Welcome to the Migraine and Headaches Forum! This forum is for questions and support regarding migraine and headache issues such as: abdominal
migraines, headaches caused by allergies, cluster headaches,
headaches, headaches in children, migraine headaches, sinus headaches, tension headaches, visual disturbances.
Magnesium toxicity is very rare except in certain instances where renal failure prevents urinary excretion. Symptoms include central nervous system depression, skeletal muscle paralysis, and in extreme cases, coma and death. Calcium infusion tends to counteract magnesium. Healthy kidney function excretes magnesium rapidly and efficiently, with little possibility for toxic buildup. Levels up to 1600 mg daily have proven to be no problem as long as there as a balance of at least 50% calcium intake at the same time.
(toxicity.http://www.springboard4health.com/notebook/min_magnesium.html)
I hope this helps. Take care and keep us posted.