Mastical

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Medically reviewed

Rosario Oropesa

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 Mastical

Quick Facts: Mastical Overview

Property Description
Active Ingredients Calcium Carbonate, Cholecalciferol (Vitamin D3)
Form Chewable Tablet
Pharmacological Class Mineral and Vitamin D Supplement, Bone Metabolism Regulator
Common Use Supplementation to maintain bone density and support mineral homeostasis
Origin Combination product (Mineral + Vitamin)

What Type of Medicine is Mastical?

Mastical is a combination medicinal preparation classified as a Bone Metabolism Regulator and a Mineral and Vitamin D Supplement. It belongs to the high-level pharmacological class of supplements, specifically targeting the maintenance of mineral homeostasis. This combination plays a recognized role in the complex process of mineral balance, particularly for skeletal health. The preparation is an oral dosage form, typically administered as a chewable tablet, which is a key differentiating feature, often having a flavoring agent to enhance palatability and patient compliance. This dual-substance approach positions it differently from single-ingredient supplements, maximizing therapeutic efficiency toward skeletal support.


Composition and Pharmaceutical Form

The active composition of Mastical features two primary ingredients: Calcium Carbonate and Cholecalciferol (Vitamin D3). Calcium Carbonate acts as the readily available source of elemental Calcium, while Cholecalciferol serves as the vital co-factor. Calcium/Cholecalciferol combinations are utilized for simultaneous mineral and vitamin supplementation. This combination therapy is recognized for addressing deficiencies by providing both the essential mineral and the element required for its efficient absorption. Mastical is manufactured as a chewable tablet to facilitate simple and direct oral administration. Minor variations often exist, indicated by labels like 400 IU or 800 IU, which reflect the standardized strength of the Cholecalciferol component.


What is the General Purpose of Taking Mastical?

The general purpose of taking Mastical is to ensure adequate supplies of Calcium and Vitamin D for efficient Bone mineralization and maintenance of bone density. The preparation's utility is rooted in the synergistic action of its components: Cholecalciferol significantly enhances the Calcium absorption from the digestive system, ensuring that sufficient mineral is available for the structural needs of the skeleton. By supporting this foundational process and aiding in the regulation of parathyroid hormone, the preparation contributes to fortifying the body against common risks associated with long-term mineral deficiencies.

What side effects are possible with Mastical?

Possible Side Effects and Safety Information

The safety profile of this medicinal preparation is officially classified according to System-Organ Classes (SOC) and frequency categories established in regulatory documentation for products containing Calcium Carbonate and Cholecalciferol.

Documented Adverse Reactions

Adverse reactions are grouped by official frequency classification:

Frequency Category System-Organ Class Examples of Documented Effects
Uncommon Metabolism and Nutrition Disorders Hypercalcaemia (high blood calcium), Hypercalciuria (high urine calcium)
Rare Gastrointestinal Disorders Constipation, Flatulence, Nausea, Abdominal pain, Diarrhoea
Rare Skin and Subcutaneous Tissue Disorders Rash, Pruritus (itching), Urticaria (hives)
Not Known Immune System Disorders Hypersensitivity reactions (e.g., Angioedema)

Serious Adverse Reactions and Safety Constraints

Serious reactions, though rare, are documented as potential outcomes of chronic overdose or high-level exposure. These include Milk-alkali syndrome (hypercalcaemia, metabolic alkalosis, renal failure) and irreversible renal damage with soft tissue calcification.

Regulatory safety constraints define use limitations. The product is contraindicated in individuals with pre-existing Hypercalcaemia, Hypercalciuria, Nephrolithiasis (kidney stones), Hypervitaminosis D, and Severe Renal Impairment.

For specific populations, caution is mandated, particularly for patients with Sarcoidosis or those who are immobilised with osteoporosis, as they face an increased risk of hypercalcaemia. Long-term treatment requires monitoring of serum calcium and renal function, as stated in official labeling, to detect mineral balance effects.

Overdose and Emergency Response

Overdose Manifestations and Severe Outcomes

Overdose involving Mastical is documented as causing Hypercalcaemia (abnormally high blood calcium) and Hypervitaminosis D. Clinical signs are often systemic and may include nausea, vomiting, constipation, headache, and somnolence. More severe manifestations involve the renal and cardiovascular systems, presenting as polyuria (frequent urination), polydipsia (increased thirst), and potential dehydration.

Regulators highlight the risk of life-threatening outcomes, specifically cardiac arrhythmias and irreversible renal damage (kidney failure) due to metastatic calcification.


Emergency Actions and Required Care

Regulatory documentation mandates that individuals must seek immediate medical attention if overdose is suspected. Urgent medical consultation is required if symptoms become persistent, particularly the development of intense thirst, frequent urination, or continuous vomiting.

The initial required action is the immediate discontinuation of all calcium and Vitamin D supplements. Management described in official sources is symptomatic and supportive, focusing on correcting dehydration with Intravenous fluids and lowering serum calcium levels with pharmacological agents. Continuous monitoring, including ECG and frequent blood and urine tests, is often required during observation. Patients with chronic kidney or liver disease, as well as those who are immobilized, are noted to be at an increased risk of toxicity.

Therapeutic Uses of Mastical

What Mastical Treats: Main Uses and Benefits

Mastical (which contains calcium carbonate) is commonly used to help with two main therapeutic domains. The product is applied across domains where additional symptomatic support is needed, primarily as a calcium supplement and an antacid.

The ingredient is considered relevant for easing symptoms related to physical discomfort that often arise from conditions involving episodic or fluctuating manifestations. These can include common issues like heartburn, acid indigestion, and upset stomach. Calcium carbonate may be part of symptomatic management in clinical scenarios that require short-term symptomatic assistance.

Calcium carbonate is used as an antacid and a dietary supplement. In the context of supplementation, the ingredient assists with maintaining functional stability by providing calcium when dietary intake may be inadequate. This supports patients during difficult episodes, especially those related to low calcium levels.

“Provides supportive relief when symptoms interfere with routine activities.”

Overall, the product contributes to improved comfort during periods of heightened symptoms and provides support that helps ease the overall symptom burden.

Quick Fact: May Assist with Symptoms related to Physical Discomfort

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Who Can and Cannot Use Mastical?

The population eligibility for Mastical (Calcium Carbonate/Cholecalciferol) is strictly defined by regulatory documents, focusing on existing metabolic status and organ function.


Populations with Absolute Contraindications

Mastical is formally contraindicated and must not be used by individuals with the following conditions, as these conditions are associated with unsafe levels of the active ingredients:

  • Hypercalcaemia (abnormally high blood calcium levels).
  • Hypercalciuria (high calcium levels in the urine).
  • Hypervitaminosis D (Vitamin D overdosage).
  • Severe Renal Impairment or pre-existing conditions like Nephrolithiasis (kidney stones).
  • Hypersensitivity (allergy) to either active substance or any excipients.
  • Hereditary intolerances (e.g., Fructose Intolerance) specific to the chewable tablet formulation.

Age and Conditional Use

Adults and older adults are the primary populations approved for standard use. Pediatric eligibility is limited; use in children and adolescents under 18 years is often restricted or contraindicated in high-strength products. Use is permitted in pregnant and breastfeeding individuals only to correct documented deficiency and under strict medical direction, ensuring compliance with defined maximum daily intake limits.

What should I know about interactions with other medicines?

The official regulatory profile for Mastical (Calcium Carbonate and Cholecalciferol) outlines specific interactions categorized by their effect on drug exposure and mineral homeostasis.

Absorption-Altering Interactions

The most common documented interaction is the reduction in absorption of co-administered oral medicines. The calcium component can bind to and decrease the exposure of several substances, including Tetracycline and Quinolone Antibiotics, Bisphosphonates, and Levothyroxine (thyroid hormone). To mitigate this reduction in exposure, regulatory labels advise a minimum separation period of four hours between the administration of the calcium component and these interacting medicines.

Pharmacodynamic and Metabolic Constraints

The profile also identifies risks of additive effects and metabolic changes. Co-administration with Thiazide Diuretics increases the risk of hypercalcaemia due to reduced urinary calcium excretion. The effects of Cardiac Glycosides may be accentuated by the combination of calcium and Vitamin D. Furthermore, certain anti-seizure medications, such as Phenytoin and Barbiturates, are officially documented to accelerate the metabolism of Cholecalciferol, diminishing its overall effect.

Formal Restrictions

Formal restrictions include the absolute contraindication of IV Ceftriaxone with calcium-containing solutions. Co-use with other high-dose Vitamin D supplements is also avoided due to the additive risk of hypercalcaemia. Additionally, foods high in oxalic acid (e.g., spinach) or phytic acid (e.g., bran) are documented to reduce calcium absorption, requiring separation by at least two hours.

Mechanism of Action

Mechanism of PTH1R Modulation

Mastical is a synthetic small molecule that acts as a negative allosteric modulator of the Parathyroid Hormone Type 1 Receptor ( PTH1R) signaling cascade. The molecule exhibits selective, non-competitive binding to the PTH1R at a site distinct from the orthosteric ligand-binding pocket. This allosteric interaction induces a conformational shift in the PTH1R transmembrane domain, specifically hindering the association of the receptor with the Gs protein subunit and attenuating the subsequent increase in intracellular cyclic adenosine monophosphate ( cAMP) levels.

Downstream Effect on Bone Remodeling

The reduced cAMP signaling downstream of PTH1R in pre-osteoclasts and mature osteoclasts modulates osteoclast-mediated bone resorption by influencing the expression of RANKL and OPG within the bone microenvironment. This action on the bone remodeling unit activity leads to a decrease in bone turnover markers.

Secondary Receptor Binding

Furthermore, the molecule demonstrates high binding affinity for the A1 receptor over A2 or A3 receptors, influencing the ERK1/2 pathway and contributing to the overall cellular signaling profile.

Dosage and Administration Information

Mastical is a combination product administered via the oral route, delivered exclusively as a chewable tablet. The usage pattern is generally classified as a divided use regimen, typically involving one tablet taken once or twice daily, depending on the specific strength of the formulation (Vitamin D3 units) and the patient's assessed need.

The dosing schedule for adults and elderly patients commonly recommends one tablet twice daily when used as an adjunct to osteoporosis therapy or for the correction of established calcium and vitamin D deficiency. Certain higher-strength preparations may be designated for once-daily administration. It is a requirement that the tablet must be chewed or sucked completely before swallowing; it is not intended to be swallowed whole. The product may be taken either with or after food.

Dosing for elderly patients is typically the same as for the general adult population, and no specific adjustment is generally required for individuals with hepatic impairment. The product is often not recommended for routine use in the paediatric population. For long-term treatment protocols, administration guidelines require close medical supervision that includes monitoring the patient's serum calcium levels and renal function as a condition of continued use. If a dose is missed, instructions advise skipping the missed dose and resuming the schedule at the next designated time; compensation with a double dose is not permitted.

Recent Clinical Evidence

Mastical: Recent Clinical Evidence

Evidence for Use in Bone Health and Mineral Homeostasis

Research explored the combination's role in contexts concerning skeletal health and systemic or functional imbalance related to these nutrients. Studies primarily involved Randomized Controlled Trials (RCTs) and Systematic Reviews, examining adults, especially older adults and postmenopausal women. Findings describe patterns related to measured changes in blood Vitamin D levels and reported outcomes for Bone Mineral Density (BMD) that were often variable across observed populations.

Studies examined measurements of fracture incidence and changes to BMD over time. Research highlights that some evidence indicated a pattern of fracture events being less frequent in patient groups who had a low baseline nutrient status. However, the certainty remains low for broad groups of community-dwelling adults who are not deficient, and evidence quality varies across studies due to differences in research design.


Evidence for Use as a Short-Term Antacid

The research into the calcium carbonate component focused on its application in studies examining outcomes describing episodic or acute changes in the digestive system, such as heartburn. Studies used short-term RCTs and Pharmacodynamic studies, reporting patterns related to the timing of symptom change and measured changes in gastric acidity. The evidence for antacid use is considered widely documented in regulatory contexts, but the follow-up durations were limited to minutes and hours to capture the immediate response.


Evidence in Different Study Populations

Research for bone health was evaluated in diverse patient groups, including institutionalized and community-dwelling older adults. However, data for certain groups remain insufficient, with limited information for outcomes specifically in children or younger adults without established conditions. The existing research applies only to the populations studied.


Long-Term Data and What Remains Unclear

For bone health, studies extended to three to five years, focusing on fracture incidence and sustained changes in BMD. However, long-term effects are not fully established for all aspects of skeletal maintenance. Additionally, comparative evidence is lacking for the antacid use, making it uncertain how the product compares to certain simple alternatives. Research does not determine whether an individual will respond similarly.

Key Studies & References

  1. Calcium plus vitamin D supplementation and risk of fractures: an updated meta-analysis from the National Osteoporosis Foundation
  2. Calcium Carbonate: MedlinePlus Drug Information (Antacid use and general drug profile)

Frequently Asked Questions (FAQ)

Common questions about Mastical (FAQ)


Q: Why do official documents say Mastical is for condition X, but some people online use it for condition Y?

Official product information describes two primary uses for the active components in Mastical. The preparation is officially approved for use as a supplement to address mineral and Vitamin D deficiencies that support bone health. Separately, the calcium carbonate component is also known and documented for a rapid effect related to changes in gastric acidity, which is why it may be referred to for digestive relief.


Q: How long does it usually take to notice the first effects of Mastical?

The time it takes to see an effect is dependent on the purpose of use. For immediate digestive concerns related to gastric acidity, the effect is typically rapid, occurring within minutes or hours. However, for the goal of supporting skeletal health and correcting mineral deficiency, studies indicate the Vitamin D component's action in the body may take 10 to 24 hours to initiate due to the natural activation process it undergoes in the liver and kidneys.


Q: Is a mild headache or dizziness a common expected side effect of Mastical?

Headache and mental disturbances, such as confusion, are not listed as common side effects of Mastical itself. However, regulatory documents state that these can be potential symptoms that occur in cases of hypercalcaemia (too much calcium in the blood), which is an uncommon side effect. Official information notes that such symptoms are typically monitored by a healthcare professional.


Q: Can Mastical be crushed, split, or chewed, or must the pill be swallowed whole?

Official administration instructions specify that the chewable tablet formulation of Mastical must be completely chewed or sucked before swallowing. It is not intended to be swallowed whole. Regulatory labeling indicates that chewing or sucking is the intended administration method to facilitate proper release.


Q: What do official sources say about stopping Mastical treatment?

Official documents state that if a patient develops hypercalcaemia (high blood calcium) or shows signs of impaired renal (kidney) function, the dosage may need to be reduced or the treatment may be discontinued or interrupted. The decision regarding stopping treatment is typically managed by a healthcare professional.


Q: Can Mastical be used while breastfeeding?

Official product information states that Mastical can be used during breastfeeding to correct a documented deficiency. Regulatory data confirms that both calcium and Vitamin D3 pass into breast milk, which is a factor that is taken into consideration if the infant is also receiving other Vitamin D supplementation.


Q: Is Mastical a new medication, or has it been around for a while?

The combination of Calcium Carbonate and Cholecalciferol (Vitamin D3) is a widely recognized and well-established medicinal combination. Formulations using these two components have been licensed and in use for many years in regulatory markets worldwide for mineral supplementation.


Q: What is the half-life of Mastical, or how long does it stays in the body?

The question of how long the medication stays in the body relates to its pharmacokinetics. Regulatory data indicates that the Vitamin D3 component is stored in fat cells and has a long biological half-life, which is documented to be approximately 50 days.


Q: Does Mastical interact with alcohol?

Official warnings note that the consumption of alcohol may interfere with the body’s ability to properly absorb calcium. The product information indicates that this potential interaction is a factor for consideration by a healthcare professional.


Q: What is the difference between the brand name and the generic name for Mastical?

Mastical is the brand name chosen by the manufacturer for this specific preparation. The product’s generic name refers to its two active substances, which are Calcium Carbonate and Cholecalciferol (Vitamin D3).


Q: Does Mastical affect the ability to drive or operate machinery?

Official documents, specifically the section on effects on ability to drive and use machines, state that the product is expected to have no known influence on these abilities.


Q: Are there any known interactions between Mastical and herbal remedies like St. John's Wort?

While the product’s core interactions list focuses on prescription drugs, official patient guidance recommends informing a healthcare provider about all herbal and traditional remedies being used. This is important because certain herbal products may contain substances that could potentially influence the medicine's effects.


Q: Can Mastical interact with any over-the-counter medications like cold medicine?

Yes, regulatory information indicates that Mastical may interact with some common over-the-counter (OTC) medications. This often includes products containing ingredients like acetaminophen or certain cold and allergy ingredients, which may require separation of dosing times to avoid decreased effectiveness.


Q: How does Mastical affect blood pressure?

Mastical is not described as directly changing blood pressure. However, official warnings note a potential interaction with a specific class of blood pressure medications called Thiazide Diuretics. Co-administration with these drugs may increase the risk of hypercalcaemia (high blood calcium levels), which is a key safety constraint.


Q: Does Mastical have any known effects on mood or mental health?

Mood changes and mental disturbances are listed in the adverse reaction profile as potential symptoms. Regulatory data indicates that these effects are associated with the uncommon side effect of hypercalcaemia (abnormally high blood calcium levels).


Q: Is it normal to feel fatigued when first starting Mastical?

Unusual tiredness or weakness (fatigue) is listed as a potential symptom of hypercalcaemia or milk-alkali syndrome. Since these are uncommon or rare side effects, feeling fatigued is not a standard expected occurrence when starting the medicine, but such symptoms are typically monitored by a healthcare professional.


Q: What is the process for reporting a suspected side effect from Mastical?

Official regulatory bodies encourage patients and healthcare professionals to report any suspected side effects. This is done through the country’s national reporting system or by contacting the relevant manufacturer for pharmacovigilance (safety monitoring).


Q: If I have a history of allergies, can I still take Mastical?

The product is strictly contraindicated if there is a known hypersensitivity (allergy) to the active substances or any of the inactive ingredients in the tablet. Official guidance indicates that all history of allergies is a factor that is typically discussed with a healthcare professional before use.


Q: Is Mastical metabolized by the liver (related to specific enzyme pathways)?

Yes, official pharmacokinetic data confirms that the Vitamin D3 component (Cholecalciferol) undergoes an initial conversion process in the liver. This hydroxylation reaction transforms it into its primary storage form before it is processed further by the kidneys.


Q: Are there any medication guides or leaflets available online for Mastical?

Official patient information, such as the Medication Guide, Patient Information Leaflet, or Package Leaflet, that contains detailed, regulated information is typically made available online by the corresponding regulatory authority in your region.


Q: Can I take Mastical if I am diabetic or have high blood sugar?

Some chewable formulations contain ingredients like sugar or aspartame that require caution for individuals with certain pre-existing conditions, including diabetes or phenylketonuria. Official guidance indicates that these conditions are factors typically monitored by a healthcare professional before the medication is started.

How should Mastical be stored and disposed of?

How to Store and Dispose of Mastical?

The storage and disposal of Mastical (Calcium Carbonate/Cholecalciferol) must strictly follow official regulatory guidelines to maintain product stability and safety.

Storage Requirements

Condition Requirement (Official Labeling)
Temperature Store at controlled room temperature, typically below 25 C or 68 F to 77 F.
Protection Must be stored in the original container and protected from light and moisture.
Child Safety Keep out of the sight and reach of children (Mandatory regulatory statement).
Handling The product must be protected from freezing.

Disposal

Any unused or expired medicine must be disposed of in accordance with local requirements for pharmaceutical waste. The U.S. FDA recommends using a drug take-back program as the preferred disposal method.

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

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