Elcal D

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Medically reviewed

Laura Arias

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Elcal D

Quick Facts

Property Description
Active ingredient Calcium Carbonate, Dihydrotachysterol (DHT)
Form Oral Solid Preparation (Tablet/Capsule)
Pharmacological class Mineral Supplement, Vitamin D Analogue
Common use Supporting bone health, regulating calcium balance
Origin Combination of inorganic salt and synthetic derivative

What Type of Medicine is Elcal D?

Elcal D is a fixed-dose combination product administered via the oral route and supplied as an oral solid preparation. It is classified pharmacologically as a combination of Mineral Supplements and Vitamin D Analogues. This dual composition ensures the body receives both a critical source of an essential mineral, calcium, and a potent factor to promote its utilization. This formulation is clinically recognized for its efficacy in assisting patients who require active regulation of calcium processing, establishing it as a highly reliable agent in mineral therapy.


Composition: What is Elcal D. Made of, and Its Origin?

The two primary active ingredients are Calcium Carbonate and Dihydrotachysterol (DHT). Calcium Carbonate is an inorganic salt widely recognized for supplying bioavailable elemental calcium. The key characteristic, and the differentiating factor for this co-formulation, is the inclusion of Dihydrotachysterol, which is a powerful, synthetic secosteroid analogue of Vitamin D. This synthetic nature is valuable because DHT does not require full metabolic activation by the kidneys, unlike natural Vitamin D2 or D3, making it particularly useful in specific metabolic contexts.


What is the General Purpose of Taking Elcal D?

The general therapeutic purpose of Elcal D is to prevent or correct deficits associated with insufficient calcium or Vitamin D, thereby supporting the body's structural integrity. Dihydrotachysterol actively regulates calcium and phosphate metabolism, maximizing the intestinal calcium absorption and ensuring the body maintains healthy mineral levels. By promoting efficient mineral uptake, the combination helps stabilize serum calcium levels, which is fundamental for maintaining the strength and health of bones and teeth, and is typically employed in patient groups facing increased physiological demand or impaired absorption capabilities.

Regulatory References

  1. USP-NF: Dihydrotachysterol Monograph

What side effects are possible with Elcal D?

Possible Side Effects and Safety Information

The safety profile for Elcal D, a combination of Calcium Carbonate and the Vitamin D analogue Dihydrotachysterol (DHT), is officially documented with a primary focus on the risk of elevated mineral levels.

Official Adverse Reaction Classification

The central safety concern is hypercalcemia (excessive calcium in the blood), which is classified as Very Common (1/10) in regulatory documents, alongside elevated serum creatinine levels. The most frequently reported adverse effects often involve the Gastrointestinal Disorders system, including nausea, vomiting, metallic taste, dry mouth, constipation, and anorexia. Effects related to the Nervous System may include fatigue, headache, and somnolence. A reaction classified as Rare is overt psychosis.

Serious Adverse Reactions and Systemic Effects

Official labeling documents severe, potentially irreversible consequences associated with sustained high calcium levels. These serious adverse reactions include nephrocalcinosis (calcium deposition in the kidneys) and generalized vascular calcification, which may lead to impaired renal function and renal insufficiency. The potential for these effects necessitates careful observation of calcium levels during therapy.

Population-Specific Safety Notes

The official safety information specifies restrictions for certain patient groups. Use of this medication is contraindicated in breastfeeding mothers because DHT is excreted in breast milk and may cause hypercalcemia in the suckling infant. The product is also contraindicated in patients with pre-existing Hypercalcaemia, Hypervitaminosis D, and Decreased renal function.

Adverse events are generally associated with excessive intake, and manifestations of overdose can be delayed, with effects potentially persisting for up to one month after treatment cessation.

Overdose and Emergency Response

The documented overdose profile for Elcal D is defined by the risk of severe, sustained hypercalcemia (excess calcium in the blood), which is the primary cause of toxicity from the combination of Calcium Carbonate and Dihydrotachysterol.

Early manifestations of overdose commonly include gastrointestinal disturbances such as anorexia, nausea, vomiting, and constipation, often accompanied by systemic signs like headache, fatigue, and polyuria (increased urination).

Overdose can progress to life-threatening outcomes, including widespread calcification of soft tissues, cardiac arrhythmias (uneven heartbeats), and potentially renal or cardiovascular failure. Due to these severe risks, regulatory guidance mandates that individuals must seek immediate medical help and contact a Poison Control Center right away when overdose is suspected or acute symptoms occur.

Official management procedures focus on the immediate withdrawal of the drug, along with supportive measures such as fluid management and the prescription of a low-calcium diet. Post-overdose monitoring is required, including regular determinations of blood calcium level and a medical check with an ECG due to the cardiac risks associated with severe hypercalcemia. Specific populations, such as pregnant individuals and those with existing kidney impairment, are cited in official labeling as having particular susceptibility to severe overdose complications.

Therapeutic Uses of Elcal D

Quick Facts: Uses of Elcal D

  • Supports bone health and mineral density.
  • May aid in the management of calcium and Vitamin D deficiencies.
  • Used to help reduce the potential risk of osteoporosis and fractures.

Elcal D is a combination product intended to support the body’s essential mineral and vitamin requirements. This medication is primarily used to address dietary or absorption-related insufficient levels of both calcium and Vitamin D. Adequate intake of these nutrients is fundamental for maintaining the normal structure and function of the skeletal system.

In clinical settings, Elcal D is a recommended component of care for individuals managing bone health concerns. Specifically, it may be prescribed to assist in slowing the rate of bone mineral loss in postmenopausal women and older adults. Supplementation with Vitamin D is necessary to facilitate the absorption of calcium in the gut, which in turn supports normal bone mineralization and helps reduce the potential for conditions such as osteomalacia (softening of bones) and rickets in children. The combination may also be used as an adjunct to other therapies to manage the potential risk of fractures associated with osteoporosis.

Eligibility and Restrictions for Use

Who Can and Cannot Use Elcal D?

Official regulatory information strictly defines the populations who may use Elcal D (Calcium Carbonate and Dihydrotachysterol). Use is contraindicated and explicitly prohibited for several patient groups. Individuals with pre-existing conditions such as Hypercalcemia (abnormally high blood calcium levels), Hypervitaminosis D (Vitamin D toxicity), or diagnosed Malabsorption Syndrome must not use this medicine. Additionally, patients with a known hypersensitivity to any component of the formulation are ineligible.

Use of Elcal D is subject to restrictions and conditional eligibility in other populations.

  • Patients with Renal Impairment are considered eligible only under strict monitoring, as regulatory documents note a risk of irreversible renal damage if hypercalcemia occurs.
  • The medicine is contraindicated in breastfeeding mothers because the active component may be excreted in human milk, posing a risk to the infant.
  • Pediatric use is highly conditional, with the label citing a narrow therapeutic window between effective and toxic doses, mandating frequent blood calcium testing.
  • Eligibility is restricted for patients taking Digitalis compounds, as the potential for drug-induced hypercalcemia can dangerously potentiate cardiotoxicity.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Elcal D, a combination of Calcium Carbonate and Dihydrotachysterol (DHT), outlines interaction risks categorized by pharmacodynamic (PD) effects and pharmacokinetic (PK) interference.

PD and Metabolic Risks

Co-administration with other Vitamin D analogues is strictly restricted due to the significant risk of severe hypercalcemia, an outcome of additive effect. This same risk applies to thiazide diuretics, which contribute to increased calcium levels. Hypercalcemia further potentiates the action of cardiac glycosides (e.g., Digoxin), increasing the documented risk of ventricular arrhythmias.

Metabolically, the plasma concentration of Dihydrotachysterol may be altered by substances that modify its hepatic processing. Anticonvulsants that induce certain enzymes may reduce its half-life, while CYP3A4 inhibitors can alter its plasma levels. Additionally, Bile Acid Sequestrants and certain foods high in oxalic or phytic acid may decrease the overall absorption of the active components.

PK Interference and Timing Rules

The Calcium Carbonate component can physically bind to other oral medicines, necessitating specific timing separation to prevent reduced absorption. Oral Bisphosphonates (e.g., Alendronate) must be taken at least 30 minutes before the calcium product. The exposure of Tetracycline and Quinolone Antibiotics, as well as drugs like Levothyroxine and Estramustine, is also officially documented as being decreased by co-administered calcium, requiring separation of doses.

Mechanism of Action

Elcal D is a combination product whose mechanism of action involves the independent actions of its two components: calcium carbonate and Calcitriol.

Calcium carbonate dissociates in the gastrointestinal lumen into elemental calcium ions (Ca^2+). These ions are absorbed primarily through the small intestine via both paracellular transport (passive, concentration-dependent) and active transcellular transport mediated by the calcium-binding protein Calbindin-D9k.

The primary active component, Calcitriol, is a calcitriol analog. It functions by binding to the Vitamin D Receptor (VDR), a nuclear receptor. VDR binding induces a conformational change that permits the receptor-ligand complex to heterodimerize with the Retinoid X Receptor (RXR). This heterodimer then translocates to the nucleus and binds to Vitamin D Response Elements (VDREs). This genomic action results in the transcription and translation of specific proteins, including Calbindin-D28k and Calbindin-D9k, which are critical for Ca^2+ transport.

Calcitriol mediates intestinal absorption of calcium and increases renal reabsorption of phosphate. It also acts on bone tissue to regulate calcium and phosphate availability for bone matrix mineralization, subsequently modulating the remineralization process. Calcitriol influences plasma calcium concentration regulatory pathways.

Dosage and Administration Information

How to Use Elcal D

Elcal D is an oral fixed-dose combination product containing Dihydrotachysterol (DHT) and Calcium Carbonate, and its administration is strictly governed by regulatory guidelines.

Administration Route and Dosing

The medication is administered exclusively via the oral route, typically supplied as tablets or capsules, or sometimes as an oral solution which requires careful measurement with a calibrated dropper. Dosing is standardized, establishing both an initial loading regimen and a subsequent long-term maintenance range. The typical maintenance dose for the DHT component ranges from 0.2 mg to 1.0 mg daily, which is often taken concurrently with supplemental calcium. The dosing schedule is generally once daily.


Procedural Instructions and Monitoring

To optimize the absorption of the calcium component, the medication is generally recommended to be taken with or shortly after a meal. Treatment requires a high degree of clinical and procedural control. Regular laboratory determinations of blood calcium levels are mandatory, and dose adjustments are made gradually, usually at intervals of four to eight weeks, based on these monitoring results. If a dose is missed, it should be taken as soon as possible, but it is explicitly advised to avoid doubling the dose to make up for the omission.


Special Populations

Official prescribing information includes specific regimens for pediatric patients (neonates, infants, and children). Furthermore, the distinct metabolic pathway of DHT, which does not require full renal activation, makes this formulation useful in setting the correct administration pattern for patients with renal impairment.

Recent Clinical Evidence

Recent Clinical Evidence

Elcal D, a combination of a calcium salt (typically carbonate) and cholecalciferol (Vitamin D3), is often studied for its role in supporting bone health and managing conditions associated with low bone density, such as osteoporosis.

Findings on Fracture Risk

Research from systematic reviews and meta-analyses of randomized clinical trials (RCTs) has investigated the effect of combined calcium and Vitamin D supplementation on the risk of fractures, particularly in older adults. Findings across multiple studies suggest that combined supplementation may be associated with a reduction in the risk of both hip fractures and total non-vertebral fractures, especially in populations with low baseline Vitamin D levels or those living in institutional settings. However, some large-scale analyses focused on healthy, community-dwelling older adults have not found a consistent, statistically significant association between routine supplementation and a lower overall risk of fracture.

Other Observed Outcomes

Outcome Examined Primary Study Finding Study Type
Bone Mineral Density (BMD) Calcium with concomitant Vitamin D supplementation, but not Vitamin D alone, has been reported to lead to an increase in BMD in certain groups. RCTs / Reviews
Calcium Absorption Vitamin D supplementation demonstrated an increase in fractional calcium absorption in some trials. Randomized Trials
Secondary Hyperparathyroidism Supplementation with Vitamin D and calcium has been shown to reduce levels of parathyroid hormone (PTH) in patients with insufficiency. RCTs

Research Context and Limitations

It is recognized that the effectiveness of this combination may vary depending on the patient's age, dietary calcium intake, and baseline Vitamin D status. Current evidence remains limited regarding the long-term efficacy and safety profile of high-dose supplementation in the general population beyond five years.

Frequently Asked Questions (FAQ)

Common questions about Elcal D (FAQ)

Q: What is the typical timeframe before noticing the expected effects of Elcal D?

Official information indicates that the dose of Elcal D is not typically changed immediately. Instead, dose adjustments are often made based on laboratory test results that are checked at intervals of four to eight weeks. This monitoring interval allows for the gradual dose adjustments based on observed laboratory values, consistent with official guidelines.

Q: Can Elcal D be used by elderly patients with no prior health concerns?

Regulatory documents indicate that the medicine is generally intended for adults who require mineral support and is indicated for conditions often seen in older adults. Use is not automatically prohibited for the elderly, but it is restricted by contraindications such as pre-existing hypercalcemia (high blood calcium) or hypervitaminosis D (Vitamin D toxicity). The medicine’s use, like all populations, is subject to careful monitoring to prevent issues like hypercalcemia.

Q: What kind of monitoring (like blood tests) is often recommended when taking Elcal D long-term?

Official prescribing information requires mandatory regular laboratory determinations of blood calcium levels throughout the course of treatment. This testing is required to help assess the medicine's activity and prevent the risk of excessive calcium buildup. Other blood tests may also be performed as needed to assess mineral balance and overall kidney function.

Q: Is Elcal D primarily for people with a confirmed deficiency?

The general therapeutic purpose of the medicine, according to official documents, is to prevent or correct established deficits associated with insufficient calcium or Vitamin D. The medicine is typically described in official documents as being used for patients facing impaired absorption or increased physiological demand, consistent with its therapeutic purpose of correcting deficits.

Q: Is there a best time of day to take Elcal D (morning, noon, or night)?

Official instructions recommend taking the medication with or shortly after a meal to help optimize the absorption of the calcium component. However, regulatory documents do not specify a particular time of day, such as morning or evening, as being definitively better.

Q: Is 'Cholecalciferol' the same as Vitamin D3 in Elcal D?

No, according to the official product information, they are not the same. The active ingredient in Elcal D is Dihydrotachysterol (DHT), which is a synthetic form, or analogue, of Vitamin D. Cholecalciferol, also known as Vitamin D3, is a different, naturally occurring form of Vitamin D.

Q: Why do some people experience a metallic taste or dry mouth while using supplements like Elcal D?

A metallic taste and dry mouth are listed in official safety documents as possible adverse effects. These symptoms are often associated with the early signs of hypercalcemia, which means excessive calcium in the blood. Hypercalcemia is a primary safety concern noted for the drug.

Q: Is fatigue or unusual tiredness a reported symptom associated with Elcal D use?

Yes, fatigue is listed in regulatory documents as a potential adverse effect related to the Nervous System. As with other nervous system effects, it may also be a sign of hypercalcemia (excessive blood calcium).

Q: Is Elcal D generally appropriate for use during pregnancy or while breastfeeding?

Official labeling states that use during pregnancy is subject to a risk-benefit assessment by a healthcare professional. However, the medicine is contraindicated—meaning explicitly prohibited—in breastfeeding mothers because the active components may be excreted in human milk, potentially causing hypercalcemia in the infant.

Q: Is there a minimum age for using Elcal D according to the official labeling?

While the labeling does not define a single minimum age, official information includes specific dosing regimens for pediatric patients of all ages, including neonates (newborns) and infants. This indicates it is authorized for use in the youngest age groups, but such use is dependent on adherence to required frequent blood testing and clinical supervision.

Q: Can Elcal D be taken with other vitamin or mineral supplements?

Official regulatory documents place strict restrictions on co-administration with other Vitamin D analogues due to the high risk of developing severe hypercalcemia (excessive calcium in the blood). Additionally, the calcium component can interfere with the absorption of other minerals, such as oral bisphosphonates, often requiring dose separation.

Q: Does Elcal D have any known interactions with anti-seizure medications like phenytoin?

Yes, regulatory documents note potential interactions. The absorption of anticonvulsants can be decreased by the calcium component, and Official documents indicate that the separation of doses is necessary to manage this interaction. Furthermore, anticonvulsants, such as phenytoin, are generally noted to potentially alter the plasma concentration of the Dihydrotachysterol (DHT) component.

How should Elcal D be stored and disposed of?

How to Store and Dispose of Elcal D?

Strict adherence to official storage guidelines is required to maintain the stability of Elcal D's active ingredients, Calcium Carbonate and Dihydrotachysterol.


Official Storage Conditions

Requirement Description
Temperature Store at Controlled Room Temperature, defined as 20°C to 25°C (68°F to 77°F).
Environment The product must be protected from light and moisture and kept in a cool, dry place.
Container Keep the container tightly closed and ensure it is light-resistant. Do not use if the seal is compromised.

Safety and Disposal

The product must be kept out of the reach of children to prevent accidental ingestion. For disposal, unused or expired medication must be discarded according to local regulations; consult a proper take-back program instead of disposing of it in household trash or down the toilet.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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