A vet could give the dragon injections of calcium followed by a shot of calcitonin when the blood calcium levels are high enough. This is the quickest way I know of to get things back in balance.
In addition to this, you need to correct husbandry issues that are leading it into MBD.
Exposure to UVB (from a Repti-sun 5.0 long linear tube, for instance) or to direct sunlight (neither of which should pass through glass or plastic will allow the dragon to produce D3 which will allow it to use the calcium in its system.
Appropriate temperatures will aid in good digestion...so it will help with nutrient absorption.
Dusting the insects with a phos.-free calcium powder at most feedings will help to make up for the often poor ratio of calcium to phos. found in most feeder insects.
I dust twice a month with a vitamin powder with a beta carotene (prOformed) source of vitamin A. Beta carotene won't build up in the system like prEformed vitamin A will. Excess prEformed vitamin A can interfere with vitamin D3 and push the dragon towards MBD.
I dust twice a month lightly with a phos.-free calcium/D3 powder. D3 from supplements can build up in the system so don't overdo it.
Insects should be gutloaded/fed a nutritious diet too. Crickets, superworms, roaches can be fed a wide assortment of greens (dandelions, kale, collards, endive, escarole, etc.) and veggies (carrots, squash, zucchini, sweet potato, sweet red pepper, etc.).
The dragon can be fed those same greens and veggies along with a small amount of fruit (apple, pear, melon, berries, etc.).
Calcium, D3, vitamin A and phosphorous are important players in bone health and need to be in balance. To attain a balance you need to look at what you feed your dragon, what you feed the insects and what you supplement with.
Hope this helps!
