Answer
Damaged kidneys may produce too little active vitamin D, disrupting calcium, phosphate and bone metabolism. Oral calcitriol replaces this active form.
Sources for this answer
- Calcitriol 0.25 mcg Soft Capsules — Current selected SmPCemc · Summary of Product Characteristics
- NHSNHS · NHS medicine guidance
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.