Shelcal-DX600 mg+400 IU

Shelcal-DX 600 mg+400 IU is a nutritional supplement combining natural eggshell-derived calcium carbonate with vitamin D3 (cholecalciferol). It is used for:

• Established uses: Prevention and treatment of dietary calcium deficiency; as a calcium and vitamin D supplement in individuals with inadequate dietary intake.
• Guideline-supported adjunct use: Adjunct to specific therapy in the management of osteoporosis and osteopenia, particularly in postmenopausal women and older adults, to reduce the risk of bone loss and fractures.
• Supportive use: Calcium and vitamin D supplementation during pregnancy and lactation when dietary intake is insufficient (as advised by a physician).
• Adjunct use: Supportive therapy in rickets, osteomalacia, and hypoparathyroidism, generally alongside specific medical management.

Shelcal-DX 600 mg+400 IU is not a substitute for prescription osteoporosis medications (e.g., bisphosphonates) but is commonly used alongside them to ensure adequate calcium and vitamin D status.

Shelcal-DX 600 mg+400 IU combines calcium carbonate sourced from processed eggshell with vitamin D3 (cholecalciferol). Eggshell is a natural source of calcium carbonate, and processed eggshell calcium is used as an alternative to synthetic or mineral-derived calcium carbonate in dietary supplements.

Calcium is an essential mineral required for bone mineralization, muscle contraction, nerve transmission, and blood clotting. Vitamin D3 is required for adequate intestinal absorption of calcium and for calcium homeostasis; without sufficient vitamin D, dietary calcium is poorly absorbed. Combining the two nutrients supports better utilization of the supplemented calcium compared to calcium alone.

Shelcal-DX 600 mg+400 IU belongs to the therapeutic class of calcium and vitamin D combination supplements, used as minerals/vitamins for bone health and metabolic calcium homeostasis.

The calcium carbonate component of Shelcal-DX 600 mg+400 IU dissociates in the acidic environment of the stomach to release calcium ions, which are absorbed primarily in the small intestine via both active (vitamin D-dependent) and passive transport. Calcium is essential for normal function of the nervous, muscular, and skeletal systems, and plays a role in normal cardiac function and blood coagulation. When dietary calcium intake is inadequate, calcium is resorbed from bone to maintain serum calcium levels, which can lead to reduced bone mineral density over time.

The vitamin D3 (cholecalciferol) component is converted in the liver to 25-hydroxyvitamin D and then in the kidney to the active form, 1,25-dihydroxyvitamin D (calcitriol), which promotes active intestinal absorption of calcium and phosphate, and supports normal bone mineralization and remodeling. Adequate vitamin D3 status significantly increases the efficiency of calcium absorption from a given calcium dose.

Take orally with or immediately after meals, with a full glass of water. If two doses are prescribed daily, space them apart (e.g., morning and night) rather than taking both at once, to maximize absorption and minimize gastrointestinal side effects.

Shelcal-DX 600 mg+400 IU can significantly reduce the absorption of certain medications and interact with others:

• Tetracycline and fluoroquinolone antibiotics: Calcium chelates with these antibiotics, markedly reducing their absorption. Separate administration by at least 2-3 hours (before) or 4-6 hours (after) the antibiotic dose.
• Levothyroxine: Calcium can reduce absorption of levothyroxine. Separate dosing by at least 4 hours.
• Bisphosphonates (e.g., alendronate): Calcium significantly reduces bisphosphonate absorption; bisphosphonates should be taken on an empty stomach, well separated from calcium supplementation.
• Thiazide diuretics: Concurrent use may increase the risk of hypercalcemia due to reduced renal calcium excretion.
• Digoxin: Hypercalcemia arising from excessive calcium supplementation can increase the risk of digoxin toxicity and cardiac arrhythmia; use with caution and monitor.
• Corticosteroids: May reduce calcium absorption; higher calcium/vitamin D intake may be required with long-term steroid use.
• Iron and zinc supplements: Calcium may reduce absorption of oral iron and zinc; separate dosing when possible.

Because eggshell-derived calcium carbonate is generally well tolerated, adverse effects with Shelcal-DX 600 mg+400 IU are usually mild and infrequent:

• Common: Constipation, bloating, gas, mild abdominal discomfort, and nausea.
• Less common: Loss of appetite, dry mouth, headache.
• Rare (usually with excessive or prolonged high-dose intake): Hypercalcemia, kidney stones, and metabolic alkalosis (see Overdose Effects and Contraindications).

Patients with known egg allergy may rarely experience hypersensitivity reactions due to the eggshell source; discontinue and seek medical advice if signs of allergic reaction occur.

Shelcal-DX 600 mg+400 IU at recommended dietary supplementation doses is generally considered acceptable during pregnancy and lactation when there is a genuine dietary calcium/vitamin D deficiency, since adequate calcium and vitamin D intake supports maternal bone health and fetal skeletal development. However, doses above the recommended daily allowance should be avoided, and Shelcal-DX 600 mg+400 IU should be used only if clearly needed and as directed by a physician, since excessive maternal calcium or vitamin D intake may carry risks. Pregnant and breastfeeding women should consult their physician before use to determine an appropriate dose based on individual dietary intake and needs.

Use Shelcal-DX 600 mg+400 IU with caution in the following situations:

• History of kidney stones: Increase fluid intake and use under medical supervision.
• Sarcoidosis or other granulomatous diseases: These conditions can cause abnormal vitamin D metabolism and increase the risk of hypercalcemia; use only under medical supervision.
• Renal impairment: Dose adjustment or avoidance may be required (see Contraindications for severe impairment).
• Egg allergy: Because the calcium source is eggshell-derived, individuals with known egg allergy should use caution or choose an alternative calcium source (see Contraindications).
• Do not exceed the recommended dose; excessive, prolonged intake increases the risk of hypercalcemia and hypervitaminosis D (see Overdose Effects).
• Drug interactions with antibiotics, levothyroxine, and bisphosphonates require dose timing separation (see Interaction).

Overdose of Shelcal-DX 600 mg+400 IU, particularly with prolonged excessive intake, may cause hypercalcemia and hypervitaminosis D, with symptoms such as nausea, vomiting, constipation, loss of appetite, excessive thirst, frequent urination, muscle weakness, confusion, and in severe cases, kidney stones or renal impairment. If overdose is suspected, seek immediate medical attention or contact a poison control center; do not attempt specific home treatment. Management is supportive and directed by a physician, and may include discontinuation of the supplement, hydration, and monitoring of serum calcium levels.

Store at room temperature (below 30°C), away from light and moisture. Keep out of reach of children.

Renal impairment: Use with caution in mild-to-moderate renal impairment and avoid in severe renal impairment or active renal calculi (see Contraindications).

Hepatic impairment: Vitamin D3 requires hepatic activation; significant hepatic impairment may reduce conversion to active vitamin D metabolites, and clinical response should be monitored.

Elderly: Commonly used in older adults for prevention of osteoporosis-related fractures; standard adult dosing generally applies, with attention to renal function and concurrent medications.

Pediatric population: See Pediatric Uses.

Calcium supplement (calcium carbonate, eggshell-derived) combined with vitamin D3 (cholecalciferol); mineral and vitamin combination supplement.

Calcium carbonate from Shelcal-DX 600 mg+400 IU dissolves in gastric acid to provide elemental calcium, which is absorbed in the intestine and used for bone mineralization, neuromuscular function, and other calcium-dependent physiological processes. Vitamin D3 is converted to its active hormonal form (calcitriol) in the liver and kidney, which upregulates intestinal calcium-binding proteins and transport channels, thereby increasing the efficiency of active calcium absorption and helping maintain normal serum calcium and bone mineralization.

Use of Shelcal-DX 600 mg+400 IU in children should be under physician guidance, with dosing individualized based on age, weight, and dietary calcium/vitamin D intake. Calcium and vitamin D are important for normal bone growth and development in children, and supplementation may be advised for children with inadequate dietary intake or at risk of deficiency. Safety and efficacy of this specific combination product's fixed dosage strengths have not been separately established for all pediatric age groups; a pediatric-appropriate formulation and dose should be selected under medical supervision.