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Calcitriol: Brands, Price & Uses in Bangladesh
Calcitriol is the active hormonal form of vitamin D3 (1,25-dihydroxycholecalciferol).
About Calcitriol
Indications of Calcitriol
Calcitriol is the active hormonal form of vitamin D3 (1,25-dihydroxycholecalciferol). It is FDA-approved and guideline-supported for the following indications:
- Established/FDA-approved uses:
- Management of hypocalcemia and secondary hyperparathyroidism in patients undergoing chronic renal dialysis.
- Management of secondary hyperparathyroidism and resultant metabolic bone disease in patients with predialysis chronic kidney disease (moderate to severe).
- Management of hypocalcemia and its clinical manifestations in patients with postsurgical hypoparathyroidism, idiopathic hypoparathyroidism, and pseudohypoparathyroidism.
- Guideline-supported / adjunct use:
- Adjunctive management of osteoporosis in select patients (e.g., postmenopausal osteoporosis with impaired vitamin D activation), typically alongside calcium supplementation and under specialist supervision.
- Off-label use (used in some settings but not a primary FDA indication):
- Adjunct therapy in certain forms of vitamin D-dependent rickets and hereditary hypophosphatemic rickets, under specialist guidance.
Dosage & Administration of Calcitriol
| Indication | Adult Dose | Pediatric Dose |
|---|---|---|
| Secondary hyperparathyroidism / hypocalcemia in dialysis patients | Initial: 0.25 mcg orally once daily; may increase by 0.25 mcg/day at 4-8 week intervals based on serum calcium and PTH levels (typical range 0.25-1 mcg/day). | Not well established in dialysis patients under 3 years; specialist-guided weight-based dosing used in older children. |
| Predialysis chronic kidney disease | 0.25 mcg orally once daily; may increase to 0.5 mcg/day if needed under monitoring. | Safety and efficacy not well established; use only under specialist supervision. |
| Hypoparathyroidism (surgical/idiopathic) | Initial: 0.25 mcg orally once daily in the morning; titrate by 0.25 mcg/day every 2-4 weeks based on serum calcium (usual maintenance 0.5-2 mcg/day). | Children 1-5 years: 0.25-0.75 mcg/day; children over 6 years: dosed as adults, under specialist supervision. |
Doses must always be individualized based on serum calcium, phosphate, and PTH levels, with regular monitoring, particularly during dose titration.
Side Effects of Calcitriol
The most significant adverse effect of Calcitriol is hypercalcemia (vitamin D toxicity), which requires prompt medical attention. Symptoms and effects may include:
- Early signs of hypercalcemia: headache, nausea, vomiting, constipation, dry mouth, muscle weakness, and polyuria (excessive urination).
- Hyperphosphatemia (elevated blood phosphate).
- Less common: metallic taste, anorexia, weight loss, somnolence, and (with prolonged severe hypercalcemia) soft tissue calcification.
Report any symptoms suggestive of hypercalcemia to a physician promptly, as this is the central safety concern requiring regular calcium monitoring during treatment.
Contraindications of Calcitriol
Calcitriol is contraindicated in patients with:
- Known hypersensitivity to Calcitriol or any component of the formulation.
- Hypercalcemia.
- Evidence of vitamin D toxicity.
Frequently Asked Questions about Calcitriol
What is Calcitriol used for?
Calcitriol is used to treat and prevent low calcium levels (hypocalcemia) and secondary hyperparathyroidism in patients with chronic kidney disease, including those on dialysis, as well as in patients with hypoparathyroidism. It is the active form of vitamin D3 and helps the body absorb calcium properly.
What is the most important side effect to watch for with Calcitriol?
The most important concern with Calcitriol is hypercalcemia (too much calcium in the blood), which can cause headache, nausea, vomiting, constipation, weakness, and excessive urination. Regular blood tests to monitor calcium levels are essential during treatment, and any of these symptoms should be reported to a physician promptly.
Can I take calcium supplements or other vitamin D products with Calcitriol?
Only under medical supervision. Combining Calcitriol with calcium supplements, other vitamin D products, or magnesium-containing antacids can increase the risk of hypercalcemia or hypermagnesemia, especially in patients with kidney failure. Always inform your physician about all supplements you are taking.
Is Calcitriol safe during pregnancy or breastfeeding?
Calcitriol should be used during pregnancy only if clearly needed, with the potential benefit outweighing potential risk, and with close monitoring of calcium levels. It passes into breast milk, so breastfeeding mothers should use it only under close physician supervision, with monitoring of the infant for signs of hypercalcemia.
What should I do if I miss a dose or think I have taken too much Calcitriol?
If you miss a dose of Calcitriol, take it as soon as you remember unless it is close to the next dose; do not double the dose. If you suspect an overdose, showing symptoms like severe nausea, vomiting, confusion, or weakness, seek immediate medical attention or contact a poison control center right away, as overdose can cause dangerous hypercalcemia.
Can I take Calcitriol with digoxin (heart medicine)?
Caution is needed. If Calcitriol causes hypercalcemia while you are taking digoxin, this combination increases the risk of dangerous heart rhythm problems (digitalis toxicity). Your physician will monitor your calcium levels and heart function closely if you need both medications.
Disclaimer
The information provided is accurate to the best of our knowledge, but it does not replace professional medical advice. We cannot guarantee its completeness or accuracy, and the absence of specific information about a drug should not be taken as an endorsement. We are not responsible for any consequences arising from this information, so please consult a healthcare professional for any concerns or questions.