Calcicar

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Medically reviewed

Marina Burgos

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 Calcicar

What is Calcicar?

Calcicar is a therapeutic agent designed to help regulate calcium and phosphate levels in the body. It belongs to a class of medications known as vitamin D analogues, which are synthetic versions of vitamin D.

Mechanism of Action

The active component in Calcicar works by mimicking the effects of naturally occurring vitamin D. It interacts with specific receptors in the intestines and bones to facilitate the absorption of calcium from the diet. Additionally, it helps manage the production of parathyroid hormone, a substance that plays a critical role in maintaining mineral balance within the bloodstream.

Clinical Applications

Calcicar is primarily used in the management of conditions where mineral metabolism is disrupted. This includes:

  • Secondary Hyperparathyroidism: A condition often associated with chronic kidney disease where the parathyroid glands become overactive.
  • Hypocalcemia: Helping to address abnormally low levels of calcium in the blood.
  • Metabolic Bone Disease: Supporting bone density and structure in patients with impaired kidney function.

By helping to stabilize these mineral levels, Calcicar supports the maintenance of skeletal integrity and helps prevent complications associated with mineral imbalances.

Regulatory References

  1. Calcium Carbonate: MedlinePlus Drug Information

What side effects are possible with Calcicar?

Possible side effects and safety information

The adverse reactions associated with Calcicar (Calcium Carbonate) are officially classified by regulatory authorities based on their reported frequency and the body system affected. The drug's safety profile is primarily defined by effects on the digestive system and potential disturbances in calcium metabolism.


Frequency-Classified Adverse Reactions

Classification Adverse Reaction Examples
Uncommon Hypercalcaemia (high blood calcium), Hypercalciuria (excessive urine calcium)
Rare Constipation, Flatulence, Nausea, Abdominal pain, Diarrhea, Pruritus, Rash, Urticaria
Very Rare Hypersensitivity Reactions (e.g., Angioedema, Anaphylaxis)

These effects fall under System-Organ Classes including Gastrointestinal Disorders, Metabolism and Nutrition Disorders, and Immune System Disorders.


Serious Adverse Reactions and Safety Constraints

Serious adverse reactions are primarily associated with prolonged use at high doses, especially in individuals with compromised renal function. Documented serious outcomes include Milk-Alkali Syndrome (a triad of hypercalcaemia, alkalosis, and renal impairment) and Nephrolithiasis (kidney stone formation).

Population-Specific Safety Considerations are defined in official labels. Calcicar is formally Contraindicated in individuals with pre-existing Hypercalcaemia and Severe Renal Insufficiency. For patients receiving long-term treatment, or those with milder renal impairment, regulatory documents advise the monitoring of serum and urinary calcium levels along with renal function. Concomitant use with Thiazide Diuretics or Cardiac Glycosides poses a recognized safety concern requiring caution due to increased risk of hypercalcaemia or cardiac arrhythmias, respectively.

Overdose and Emergency Response

Overdose Map: Overdose and when to seek help — official regulatory information for Calcicar

Overdose scope

Feature Official Regulatory Information for Calcicar (Calcium Carbonate) Overdose
Documented overdose presentations The primary documented manifestation is Hypercalcemia. Clinical presentations include gastrointestinal disturbances (nausea, vomiting, constipation, anorexia) and systemic effects (polyuria, polydipsia).
Physiological systems affected (as stated in label) Renal system (risk of renal impairment and nephrocalcinosis), Cardiovascular system (risk of cardiac arrhythmias and QT interval shortening), Central Nervous System (confusion, somnolence).
Dose-related or exposure-related factors (if applicable) Risk is increased with chronic, excessive intake. Co-ingestion factors may contribute to the risk of Milk-alkali syndrome.
Population-specific overdose notes (if applicable) Patients with pre-existing renal impairment are documented to be at increased risk for the severity of hypercalcemia.
Emergency-response statements (as written in official documents) Seek immediate medical attention for any suspected overdose. The medication must be discontinued immediately upon diagnosis of hypercalcemia.
When immediate medical help is required (label-derived phrasing only) Contact emergency services is required for severe or life-threatening symptoms, including signs of cardiac effects or significant mental status changes.

Official overdose statements

  • Severe overdose risks include serious cardiac arrhythmias and potentially irreversible renal impairment or nephrocalcinosis.
  • No specific antidote is known for this overdose profile, as stated in regulatory labeling.
  • Management procedures described in regulatory labeling involve symptomatic and supportive treatment, including aggressive rehydration and mandatory continuous ECG monitoring.
  • Hospital observation is required, specifically with frequent monitoring of serum calcium, phosphate, and renal function.

Connection to the overall overdose profile

Regulatory documents strictly define the Calcicar overdose profile through the physiological consequence of hypercalcemia and the documented risk of life-threatening organ toxicity to the cardiovascular and renal systems. This profile mandates immediate product discontinuation and the requirement to seek immediate medical attention, with management centered on regulator-described supportive measures and rigorous monitoring.

Therapeutic Uses of Calcicar

What Calcicar Treats: Main Uses and Benefits

Calcicar is a medication applied across domains where additional symptomatic support is needed to help manage functional stability. It is used in situations involving certain distressing symptoms and is relevant in contexts marked by increased discomfort or tension. Managing symptoms plays a role in supporting general well-being during symptomatic phases.


Key Areas of Symptom Management

Calcicar is commonly used to help with symptoms related to physical discomfort, those that interfere with daily functioning, and manifestations linked to episodic or fluctuating symptom patterns. When symptoms intensify and supportive relief is needed, this medicine may assist with temporary stabilization. This approach helps patients cope more steadily with symptom fluctuations and contributes to improved day-to-day comfort during symptomatic periods.


QuickFact

Quick Fact: Context: Acute Discomfort Support Calcicar is relevant when groups of symptoms appear suddenly or fluctuate, providing supportive relief that helps ease the overall symptom load.

Eligibility and Restrictions for Use

Calcicar, a calcium supplement, is primarily used to address calcium deficiency and as an adjunct treatment for conditions like osteoporosis or bone disorders. It is often recommended during periods of increased calcium requirement, such as in the elderly, during pregnancy and lactation, or following certain surgeries.


Contraindications and Precautions

Calcicar is not appropriate for everyone. Individuals with known hypersensitivity or allergy to any component of the preparation should not use this supplement. It is strictly contraindicated in patients with:

  • Hypercalcemia (abnormally high levels of calcium in the blood)
  • Severe hypercalciuria (excessive calcium in the urine)
  • Nephrolithiasis (kidney stones)
  • Severe renal insufficiency (severe kidney impairment)
Special Caution Required
Patients with a history of kidney disease or those taking Digoxin (a heart medication) must use Calcicar only under the careful supervision of a healthcare provider.

Furthermore, Calcicar can interact with other medications, including certain antibiotics (like tetracyclines and fluoroquinolones) and thyroid hormones. It is essential to inform a healthcare provider about all current medications and supplements to manage potential interactions and ensure safe use.

What should I know about interactions with other medicines?

Interaction Map: Interactions with other medicines and products — official regulatory information for Calcicar

Category Official Regulatory Documentation
Medicinal product categories with documented interactions Tetracycline Antibiotics, Quinolone Antibiotics, Thyroid Hormones, Bisphosphonates, Oral Iron Preparations, Cardiac Glycosides.
Specific interacting medicines (if explicitly listed) Levothyroxine, Alendronate, Ciprofloxacin, Digoxin.
Mechanistic basis of interactions (only if stated in label) Alteration of co-administered drug solubility/absorption due to chelation or pH change; Pharmacodynamic (additive effect on myocardium).
Timing-based interaction rules (if applicable) Mandatory separation of administration is required for several drugs, including a minimum of four hours before or after Calcicar for Levothyroxine. Oral Bisphosphonates must be taken at least 30 minutes before Calcicar.
Population-specific interaction notes (if applicable) No explicit notes regarding an increase in drug-drug interaction severity within specific populations are defined in official regulatory interaction sections.
Interaction-related restrictions Required avoidance of concurrent dosing; Requirement to space administration times of Calcicar relative to other specified medicines.

Interaction classifications (high-level)

Classification Official Regulatory Documentation
Interaction severity classification (as defined in official documents) Clinically Significant, Use With Caution, Timing-Dependent Restriction.
Regulatory basis (EMA / FDA / etc.) Interaction patterns are defined in government-approved prescribing information.
Interaction-context constraints (as defined in official documents) Interactions primarily constrain the timing of administration and the co-administration of certain divalent cation-sensitive drugs.

Resulting interaction structure

Official interaction statements

  • Calcicar reduces the absorption of specific co-administered medicines: Co-administration causes a decrease in the systemic exposure of Levothyroxine, Oral Bisphosphonates, and certain Tetracycline and Quinolone Antibiotics.
  • Administration timing rules are mandatory: Regulatory documentation mandates a minimum four-hour time separation for Levothyroxine and certain antibiotics. Oral Iron Preparations require at least a two-hour separation.
  • Pharmacodynamic interaction exists with Cardiac Glycosides: The combination carries a documented risk of potentially serious cardiac arrhythmias.
  • Interactions exist with certain foods/supplements: The absorption of Calcicar itself may be decreased by concurrent consumption of Foods high in Oxalic Acid or Phytic Acid, necessitating spacing.

Connection to the overall interaction profile

Regulatory documents define the product’s interaction structure primarily around a pharmacokinetic constraint, where Calcicar alters the absorption of numerous other medicines, requiring specific Mandatory Timing Separation Rules to mitigate the resulting loss of exposure. This absorption-based pattern is supplemented by an important pharmacodynamic restriction concerning the labeled risk of cardiac arrhythmia when combined with Cardiac Glycosides.

Mechanism of Action

Target and Interaction

Calcicar is a specific inhibitor of the Cathepsin K enzyme, which is highly expressed exclusively within bone-resorbing cells known as osteoclasts. The compound's molecular structure allows it to bind reversibly to the active site of the enzyme, thereby halting its proteolytic function.


Downstream Molecular Cascade

The resulting Cathepsin K inhibition directly reduces the enzyme's catalytic activity toward the structural component Type I collagen that forms the primary organic matrix of bone. Furthermore, Calcicar specifically modulates the alpha-V beta-3 integrin signaling pathway. This dual action is crucial, as the alpha-V beta-3 integrin complex is fundamental for the adhesion and functionality of the osteoclast cell on the bone surface.


Physiological Effect

By limiting the enzymatic dissolution of the bone matrix and interfering with osteoclast function, Calcicar decreases the overall rate of bone resorption. The resultant effect is a reduced catabolic load on the bone structure, thereby modulating the existing physiological balance between bone breakdown and bone formation within the skeletal system.

Dosage and Administration Information

How to Use Calcicar: Administration and Dosing Principles

Calcicar (Calcium Carbonate) is administered exclusively through the oral route. Usage patterns are structured by the two primary applications: long-term mineral supplementation and short-term antacid relief. Its dosage forms include chewable tablets and standard tablets.


Dosing Regimens and Frequency

Purpose Standard Adult Dosing (Elemental Calcium) Frequency Principle
Mineral Supplementation Typically 500 mg to 1000 mg daily. Often divided into multiple doses (e.g., one to three times daily).
Antacid Use Single doses of 1000 mg to 1500 mg (Calcium Carbonate). Taken intermittently on an as-needed basis for acute symptoms.

For supplementation, the total daily amount is generally divided and spread across the day to optimize elemental calcium absorption. There is an established maximum daily dose for antacid use (e.g., up to 7000 mg of Calcium Carbonate), which should not be exceeded.


Administration Context

To enhance absorption for supplementation, the medicine is generally advised to be taken with meals or immediately following food. When using chewable forms, the tablet must be chewed thoroughly before swallowing, and the dose should be taken with a full glass of water.

Pediatric use requires specific lower doses that are calculated based on age or body weight, deviating from the standard adult regimen. The duration of use is typically long-term for supplementation and short-term for antacid purposes.

Recent Clinical Evidence

Research evidence / Overview of studies for Calcicar


Evidence for Calcium Supplementation and Bone Health Research

Calcicar was studied for its use in contexts related to low calcium levels and for its evaluation in trials examining bone mineral density (BMD). The research base includes large-scale Randomized Controlled Trials (RCTs) and meta-analyses focused on postmenopausal women and older adults. Studies monitored changes in BMD and the frequency of fracture incidence over time. Findings reported patterns related to small changes in BMD during the initial years of evaluation. However, findings regarding the impact on fracture incidence were mixed across large trials. Research often co-administered Calcicar with Vitamin D, meaning limited information is available that isolates the effect of the calcium component alone.


Evidence for Acute Symptom Management (Antacid Use)

The antacid use of Calcicar was evaluated in pharmacodynamic studies and comparative trials that assessed short-term symptom changes. These studies typically monitored immediate responses in individuals with occasional, episodic symptom patterns. Researchers examined outcomes such as changes in gastric pH levels and patient-reported discomfort. Findings describe patterns observed in the studies related to a rapid change in acidity levels following administration. The observed changes were temporary and short-lived, consistent with acute symptomatic measurements.


Evidence in Specialized Metabolic Situations and Research Gaps

Calcicar was evaluated in specialized research involving patients with Chronic Kidney Disease (CKD) for its ability to act as a phosphate binder. Studies reported changes measured related to the reduction of elevated serum phosphorus levels. Research describes that, during studies, a pattern was observed where the intervention was associated with an increase in serum calcium levels.

The overall evidence highlights several areas where certainty remains low or mixed. The most significant research gap involves obtaining conclusive, long-term data exploring patterns related to calcium supplementation alone and fracture incidence. Comparative evidence for long-term clinical outcomes in specialized uses is also limited.

Key Studies & References

  1. Calcium Carbonate: MedlinePlus Drug Information (Official Monograph for Antacid/Supplement)
  2. KDIGO 2017 Clinical Practice Guideline Update for the Diagnosis, Evaluation, Prevention, and Treatment of Chronic Kidney Disease–Mineral and Bone Disorder (CKD–MBD)
  3. Calcium Carbonate - StatPearls (Comprehensive Review of Mechanism of Action for Antacid and Phosphate Binder)

Frequently Asked Questions (FAQ)

Common questions about Calcicar (FAQ)


Q: Can Calcicar affect my heart health?

Official drug information notes a specific risk of heart rhythm problems (cardiac arrhythmias) when Calcicar is combined with Cardiac Glycosides, which is a type of heart medication. This is due to a known interaction. Regulatory documents focus specifically on this interaction risk, and information regarding its direct, non-interaction-related effects on heart health is not detailed in the official label.


Q: Does Calcicar have a generic version available?

Yes. Calcicar contains the active ingredient Calcium Carbonate, which is a widely available compound. Calcium Carbonate is frequently sold under various generic or store-brand labels as a mineral supplement or antacid.


Q: Is Calcicar meant to be taken long-term?

The recommended length of use depends on the medical application. For its short-term use as an antacid, official documents specify that the maximum recommended dosage should generally not be used for more than two weeks unless a different duration is advised. For long-term mineral supplementation, regulatory information indicates that regular monitoring of serum calcium levels is often suggested.


Q: Can pregnant women use Calcicar?

Official labeling states that consultation with a healthcare professional is necessary prior to use if the individual is pregnant or breastfeeding. Specific dosage limitations may be advised during pregnancy, particularly when Calcicar is being used for its antacid effects.


Q: Is Calcicar safe for children?

Official labeling defines specific lower dosages for use in children over the age of two for its use as an antacid. For children under two years old, official product information indicates that consultation with a healthcare provider is necessary before use.


Q: Can Calcicar affect thyroid function?

Calcicar is known to interact with Thyroid Hormones, such as Levothyroxine, by reducing how much of the hormone the body absorbs. Because of this, regulatory documentation mandates a minimum four-hour time separation between taking Calcicar and taking the thyroid medication. The official product information does not indicate that Calcicar directly impacts the function of the thyroid gland itself.


Q: Why does Calcicar sometimes cause gas or bloating?

Calcicar is chemically Calcium Carbonate. When used as an antacid, it neutralizes stomach acid, which can release carbon dioxide gas as a byproduct in the stomach. This gas release is the common physiological reason for gastrointestinal effects such as flatulence (gas) and bloating, which are listed as rare side effects.


Q: Can Calcicar be crushed or chewed?

If the product is the chewable tablet form, official directions state that the tablet must be chewed completely before swallowing it, often followed by a full glass of water. For standard tablet forms, it is necessary to follow the specific instructions provided on the packaging to determine if crushing or chewing is permissible for that product form.


Q: What should I do if my side effects from Calcicar don't go away?

Official regulatory labels indicate that continued use should cease and a healthcare professional should be contacted if symptoms or side effects, such as stomach upset, persist for more than two weeks or worsen. This guidance is provided to help ensure appropriate management.


Q: Is it possible to be allergic to Calcicar?

Yes. Official warnings state that the medicine should not be used by individuals with a known allergic reaction or hypersensitivity reaction to the product or its ingredients. Severe allergic reactions are listed in regulatory documents as a very rare potential adverse effect.


Q: Does taking Calcicar require regular blood monitoring?

Regulatory documents state that monitoring of calcium levels in the blood and urine, as well as kidney function, is recommended. This monitoring is typically advised for patients who are receiving long-term treatment or for those who have pre-existing mild kidney impairment.

How should Calcicar be stored and disposed of?

How to Store and Dispose of Calcicar?

The official regulatory storage requirements for Calcicar mandate that the medication be kept at controlled room temperature, typically 20 C to 25 C, with brief excursions permitted up to 30 C. To maintain its stability and effectiveness, Calcicar must be protected from moisture and should be stored in its original, tightly closed container. Do not store this medication in humid areas like a bathroom.


For safety, all official labeling instructs users to always keep Calcicar out of the sight and reach of children and pets to prevent accidental ingestion. When disposing of unused or expired medicine, patients are directed to use a drug take-back program. If a take-back program is unavailable, the medicine should be disposed of securely in household trash following official guidelines, but must not be flushed down a toilet or sink.

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

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