Holekalciferol Krka (Colecalciferol)

Holekalciferol Krka is used primarily to address insufficient vitamin D levels and related conditions.

• Treatment of vitamin D deficiency identified by laboratory testing.
• Prevention of rickets in children with limited sun exposure.
• Support of bone mineralization in adults at risk of osteomalacia.
• Adjunct to calcium therapy for osteoporosis management.
• Seasonal supplementation during winter months in northern latitudes.

• Colecalciferol is converted in the liver to 25‑hydroxyvitamin D, which is further hydroxylated in the kidney to the active hormone 1,25‑dihydroxyvitamin D (calcitriol). Calcitriol binds to the vitamin D receptor (VDR) in intestinal cells, enhancing transcription of calcium‑binding proteins and increasing absorption of calcium and phosphate from the gut, thereby facilitating bone mineralization and maintaining serum calcium homeostasis.

Adverse reactions to oral colecalciferol are generally uncommon, but they can occur.

Common

• Mild gastrointestinal discomfort such as nausea or abdominal bloating.
• Transient headache or dizziness.
• Slight increase in serum calcium without clinical symptoms.
• Fatigue or a general feeling of malaise.

Serious

• Hypercalcemia presenting with polyuria, polydipsia, or muscle weakness.
• Kidney stones due to calcium precipitation.
• Severe allergic reactions including rash, itching, or swelling of the face.
• Cardiac arrhythmias related to elevated calcium levels.
• Soft‑tissue or vascular calcification in extreme cases.

When considering Holekalciferol Krka, several precautionary measures should be observed to ensure safe use.

• Verify vitamin D status with laboratory testing before initiating supplementation.
• Avoid use in individuals with known hypercalcemia or hyperparathyroidism.
• Monitor calcium and phosphate levels periodically during long‑term therapy.
• Use with caution in patients with renal impairment or granulomatous diseases.
• Pregnant or breastfeeding women should consult a healthcare professional before use.
• Do not exceed the recommended daily allowance unless directed by a clinician.

Colecalciferol may interact with certain medications, affecting calcium balance or vitamin D metabolism.

Avoid

• Thiazide diuretics combined with high doses of vitamin D, which can precipitate hypercalcemia.
• Vitamin D analogues or high‑dose calcitriol preparations, increasing risk of calcium excess.

Use with caution

• Calcium supplements, as combined intake may raise serum calcium levels.
• Anticonvulsants such as phenytoin or phenobarbital that accelerate vitamin D catabolism.
• Glucocorticoids, which can reduce vitamin D effectiveness.
• Weight‑loss drugs that affect fat absorption, potentially altering vitamin D bioavailability.