September 12, 2026
Bearded Dragon Metabolic Bone Disease
The most common presentation in captive reptiles. Usually a husbandry problem.
Fix the husbandry, fix the disease.
2yo bearded dragon, rubbery jaw, can't catch crickets anymore, swollen rear legs. Owner has it on sand substrate with a regular light bulb. No UVB. Classic MBD right? Treatment?
🦎NUTRITIONAL MBD, FIX HUSBANDRY FIRST — No UVB = no vitamin D3 synthesis = no calcium absorption. Rubbery jaw and pathologic swelling are classic. Treat medically AND correct the environment.
Diagnosis and Medical Treatment
- Radiographs: Generalized osteopenia, cortical thinning, possible pathologic fractures. Ionized calcium often low.
- Calcium glubionate: 1 mL/kg PO q12h (NeoCalGlucon). If tetany/seizures: calcium gluconate 10% at 50–100 mg/kg IV slowly.
- Vitamin D3 + assist feeding: Calcitriol if severe. Syringe feed Critical Care (Oxbow). SQ fluids LRS 20 mL/kg q24–48h if dehydrated.
⚠️ Husbandry Corrections (THE Actual Treatment)
- UVB lighting: Reptisun 10.0 T5 HO or Arcadia 12%, 10–12 inches from basking, NO glass between. Replace every 6 months.
- Temps: Basking 100–110°F, cool side 80–85°F. Remove sand substrate (impaction risk), use tile or paper towel.
- Calcium dusting: Every feeding (no phosphorus). D3 supplement 2x/week. Diet: juveniles 80% insects/20% greens, adults reverse.
Your bearded dragon has weak, soft bones from calcium deficiency caused by lack of UVB lighting. Without UVB, reptiles can't make vitamin D or absorb calcium. We'll treat with supplements, but fixing the habitat is the real treatment. With proper UVB and calcium, most improve significantly in 4–8 weeks.
Sources
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