The range of pathologies associated with Mg deficiency is staggering: hypertension (cardiovascular disease, kidney and liver damage, etc.), peroxynitrite damage (migraine, multiple sclerosis,
What, Multiple Sclerosis is associated with magnesium deficiency.
I'm sure their are drugs approved for the treatment of many of the conditions associated with magnesium deficiency though. Of course, there are drugs to treat many of the side effects caused by the other drugs... and so on.