eMedicine: Hypermagnesemia 
Nona Novello, MD explains the importance of magnesium in the function of the human body. Includes synonyms, symptoms, causes, lab studies, medication, and follow-up care.
http://www.emedicine.com/emerg/topic262.htmeMedicine: Hypermagnesemia
Clinical article discusses normal magnesium levels, causes of elevated serum levels, effects, and treatment.
http://www.emedicine.com/med/topic3383.htm
Hypermagnesemia
Wikipedia article explains what this condition is, symptoms, causes, and predisposing conditions.
http://en.wikipedia.org/wiki/Hypermagnesemia
Hypermagnesemia
Medical library journal explains advances in the treatment of high magnesium. Includes normal levels, clinical evaluation, effect on the heart and muscles, and treatment.
http://www.medical-library.org/journals2a/hypermagnesemia.htm
