calcitriol: prescribing and clinical use
Focused clinical detail for use alongside current product information, local policy and patient-specific assessment.
calcitriol: clinical details
Prescribing considerations
- Review dietary calcium, supplements, fortified products and other vitamin D preparations before and during oral treatment.
- Avoid dehydration in patients with normal renal function unless fluid intake is otherwise restricted.
- For ointment, consider treated surface area, calcium-metabolism disorders, concurrent systemic treatment and additive local irritants.
- Safety and efficacy are not established for either selected formulation in children.
Contraindications and cautions
- Oral: hypersensitivity, disorders associated with hypercalcaemia, metastatic calcification or evidence of vitamin D toxicity.
- Ointment: hypersensitivity, hypercalcaemia or abnormal calcium metabolism, kidney or liver dysfunction, or systemic treatment affecting calcium homeostasis.
Monitoring
- Serum calcium and renal function during oral treatment and after clinically significant changes in treatment, diet or interacting medicines.
- Serum phosphate and calcium–phosphate product, particularly in renal failure.
- Symptoms of hypercalcaemia and ectopic calcification.
- For topical treatment, consider serum or urinary calcium if excessive exposure or systemic effects are suspected; monitor calcium if used during pregnancy.
Clinical pharmacology
Calcitriol is a vitamin D receptor agonist and the active hormonal form of vitamin D. Oral calcitriol is rapidly absorbed and directly affects calcium and phosphate transport. Topical calcitriol acts mainly on skin-cell growth, differentiation and inflammatory pathways, although some systemic absorption occurs.
Formulation and product differences
- Soft capsules provide systemic exposure for bone and mineral disorders.
- Ointment treats plaque psoriasis and acts mainly locally, but excessive application can affect serum or urinary calcium.
- Paraffin-based ointment excipients can make contaminated clothing, bedding or dressings burn more easily.
calcitriol preparations and strengths
Ointment
Route: Cutaneous
Strengths: 3 micrograms/g
Capsule
Route: Oral
Strengths: 0.25 micrograms, 0.5 micrograms
calcitriol interactions
Check prescribed, over-the-counter and supplementary products because interactions may alter calcium balance or absorption.
Calcium supplements or calcium-rich preparations
Uncontrolled additional calcium can cause hypercalcaemia.
Vitamin D and vitamin D analogues
Combined exposure increases the risk of vitamin D toxicity and hypercalcaemia.
Sources
These sources were used to prepare and review this medicine page.
Prepared and reviewed by the iatroX editorial team.