Calcort

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Calcort

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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 Calcort

Quick Facts

Property Description
Active ingredient Deflazacort
Form Oral Tablet and Oral Suspension (liquid)
Pharmacological class Corticosteroid (Glucocorticoid)
Common use Systemic Anti-inflammatory, Immune Modulation
Origin Synthetic (Manufactured)

What is Calcort (Deflazacort) and Its Classification?

Calcort is a brand name for the active drug Deflazacort, which is chemically classified as a powerful corticosteroid. Corticosteroids are synthetic medicines designed to mimic the effects of natural steroid hormones produced by the adrenal glands. Specifically, Deflazacort belongs to the Glucocorticoid subgroup, which means its primary function is to influence the body’s metabolic and immune responses. The drug possesses potent anti-inflammatory effects compared to older-generation steroids.

Composition, Origin, and Forms

The medication is a synthetic, single-ingredient product that is administered orally, often differentiated by its suspension form. Calcort’s active core is solely Deflazacort, unlike combination drugs. The product is supplied for the Oral route in two primary dosage forms: a tablet and a liquid oral suspension. The availability of the oral suspension is a factor that can facilitate administration to specific patient groups who may have difficulty swallowing tablets.

What is the General Purpose of Calcort?

The general purpose of Calcort is to provide broad anti-inflammatory and immune-modulating effects throughout the body. It is used to help control conditions where inflammation or an overactive immune system is causing systemic issues. This helps to manage the underlying processes that lead to severe swelling, pain, and tissue damage. Deflazacort is associated with a reduced impact on bone mineral density compared to older compounds. This characteristic is considered a differentiator when evaluating long-term therapy options for patients.

Regulatory References

  1. DEFLAZACORT tablet - DailyMed

What side effects are possible with Calcort?

Calcort (deflazacort) is a corticosteroid, and like all medicines in this class, it can cause side effects. The potential for side effects is often related to the dosage and the duration of treatment.


Common Side Effects

These side effects are frequently reported and usually manageable, but you should still discuss them with your healthcare provider:

  • Endocrine and Metabolic Changes: Increased appetite, weight gain, a rounder or “moon” face (Cushingoid appearance), and increased body hair (hirsutism).
  • Infections: Increased risk of infection, such as the common cold (nasopharyngitis), due to immune suppression.
  • Other: Frequent daytime urination, cough, abdominal discomfort, and changes in mood (e.g., irritability).

Serious and Potentially Severe Side Effects

Contact your doctor immediately if you experience any signs of a serious reaction, including but not limited to:

System Potential Serious Issues
Cardiovascular Hypertension (high blood pressure), fluid retention, and blood clots.
Endocrine Adrenal insufficiency (sudden withdrawal can be fatal), and Cushing's syndrome.
Ophthalmic Development of cataracts or glaucoma (vision changes, eye pain).
Musculoskeletal Osteoporosis (weak bones and fractures), and muscle pain/weakness.
Gastrointestinal Severe stomach pain, signs of bleeding (black, tarry stools, or vomiting blood).
Psychiatric Severe mood changes, including depression, aggression, or suicidal thoughts.
Allergic/Skin Signs of a severe allergic reaction (hives, difficulty breathing, swelling of the face) or severe skin reactions (blistering, peeling rash).

Important Safety Information

  • Do not stop taking Calcort abruptly without consulting your doctor, as this can lead to severe withdrawal symptoms or adrenal crisis.
  • Corticosteroids can mask the signs of an infection; report any fever, chills, or new illness to your doctor right away.
  • Avoid grapefruit and grapefruit juice while taking this medication, as it may increase drug levels in the body.

Overdose and Emergency Response

Calcort Overdose and When to Seek Help

The official regulatory profile for Calcort overdose emphasizes the risks associated with chronic high-dose exposure and the mandatory actions required for acute, life-threatening symptoms. Specific cases of acute deflazacort intoxication have generally not been formally described in regulatory documents.

Documented Manifestations and Risks

The primary physiological concern associated with prolonged ingestion of high doses is the potential for Hypothalamic-Pituitary-Adrenal (HPA) axis suppression. This functional outcome is tied to chronic exposure and requires monitoring. Regulatory guidance advises monitoring electrolyte balance as part of the supportive care in this context. No special precautions beyond those standard for general glucocorticoid therapy are cited for elderly or renally impaired patients.

When Immediate Medical Help Is Required

Emergency medical attention must be sought immediately if an overdose is suspected and severe, life-threatening symptoms are observed. These symptoms, as listed in official guidance, include collapse, having a seizure, experiencing trouble breathing, or being unable to be awakened.

Immediate regulatory guidance requires calling a poison control helpline or emergency services (911) if these critical signs occur. The documented intervention approach is symptomatic treatment, as no specific antidote is known or listed in regulatory labeling.

Therapeutic Uses of Calcort

Quick Facts: Main Uses

  • A treatment for Duchenne muscular dystrophy (DMD) in patients 5 years of age and older.
  • Used in supportive management for various inflammatory and autoimmune conditions.
  • May help support muscle strength and physical function in treated populations.

Calcort (deflazacort) is a prescription medication utilized in therapeutic regimens for various medical conditions where a corticosteroid is indicated. Its primary approved use is for the treatment of Duchenne muscular dystrophy (DMD) in patients 5 years of age and older. This application aims to provide supportive effects related to muscle strength and motor function. Calcort is often introduced as a long-term component of comprehensive care plans to help maintain quality of life.

Beyond DMD, this medication is also employed as a component of treatment for a wide range of inflammatory and immunologic conditions. These may include certain types of arthritis, asthma, systemic lupus erythematosus, and specific autoimmune disorders. As with all prescription treatments, the therapeutic goals and management plan must be established by a qualified healthcare professional.

Regulatory References

  1. FDA therapeutic overview

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Calcort — Official Regulatory Information

This section outlines the population eligibility and non-eligibility criteria for Deflazacort (Calcort) based strictly on authoritative governmental regulatory documents.


Eligibility Scope

Category Official Regulatory Statement
Populations for whom use is allowed Patients 2 years of age and older (for the FDA-approved indication of Duchenne Muscular Dystrophy) and the general adult population.
Populations for whom use is not recommended Lactating women (due to potential for growth/endocrine effects in the infant); Children under 2 years of age (safety/efficacy not established).
Populations for whom use is contraindicated Patients with known hypersensitivity to any component; individuals with untreated systemic infections; patients receiving live or live attenuated vaccines.
Condition-specific eligibility rules Severe hepatic impairment is not studied; use in patients with certain gastrointestinal disorders (e.g., peptic ulcers) requires special caution due to increased risk of perforation.
Pregnancy and lactation eligibility status Pregnancy use is restricted and only permitted if the potential benefit outweighs the known risks; lactation is not recommended.

Eligibility Classifications (High-Level)

Classification Regulatory Status
Eligibility severity classification Contraindicated (Absolute exclusion); Not Recommended (Conditional exclusion).
Eligibility-context constraints Use is constrained by age threshold and immune status (vaccine receipt).

Resulting Eligibility Structure

Official eligibility statements:

  • The minimum established age for use is 2 years.
  • Hypersensitivity, untreated infections, and live vaccination status are absolute contraindications.
  • Patients with hepatic impairment and gastrointestinal comorbidities require conditional use and close monitoring, as noted in the prescribing information.

Connection to the overall eligibility profile

Regulatory documents define who can and cannot use the medicine by establishing definitive contraindications based on immune and allergic status, setting a clear age threshold for established use, and restricting its application in patients with specific organ function limitations or gastrointestinal risks. This information is designed to strictly delineate the appropriate patient population.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official interaction profile for Calcort (Deflazacort) is structured around managing the concentration of its active metabolite and mitigating pharmacodynamic risks.

Pharmacokinetic Interactions

Deflazacort's active metabolite is primarily metabolized by the CYP3A4 enzyme. Co-administration with moderate or strong CYP3A4 inhibitors (e.g., Clarithromycin, Itraconazole, Diltiazem, Verapamil) may significantly increase the concentration of the active metabolite. Conversely, moderate or strong CYP3A4 inducers (e.g., Phenytoin, Rifampin, Carbamazepine, Efavirenz) may decrease the concentration of the active metabolite, potentially reducing efficacy. Official labeling mandates a dose reduction when used with potent inhibitors and advises avoiding use with moderate or strong inducers.

Pharmacodynamic Interactions

Due to the drug's immunosuppressive effects, live or live attenuated vaccines are contraindicated because of the risk of infection dissemination and diminished immune response. Additionally, co-administration with other medicines may increase specific risks:

  • Quinolone antibiotics increase the risk of tendon rupture.
  • Antidiabetic agents may have their blood-sugar-lowering effect reduced.
  • Anticoagulants (like Warfarin or Acenocoumarol) require close monitoring as their effects may be altered.
  • Antacids reduce absorption and should be spaced by at least two hours.
  • Grapefruit juice is a CYP3A4 inhibitor and is contraindicated.

Mechanism of Action

How Calcort Works: Mechanism of Action

Calcort (deflazacort) functions as a prodrug, undergoing rapid conversion to its active metabolite, 21-desacetyldeflazacort, which binds to the intracellular Glucocorticoid Receptor (GR) in the cytoplasm of target cells. This binding causes the activated complex to translocate into the nucleus, initiating the drug's biological influence.

The complex modulates gene expression through two primary mechanisms. First, it utilizes transrepression by directly or indirectly inhibiting pro-inflammatory transcription factors, such as NF-κB (Nuclear Factor kappa B). This suppression leads to decreased synthesis of inflammatory mediators and reduced immune cell activity at the site of signaling.

Second, the complex uses transactivation, binding to Glucocorticoid Response Elements (GREs) to upregulate the transcription of specific metabolic enzymes. This dual regulatory effect on metabolism is a direct consequence of GR engagement, leading to inherent physiological changes, including enhanced gluconeogenesis (glucose production) and increased protein catabolism (muscle breakdown).

Dosage and Administration Information

How Calcort (Deflazacort) is Used: Official Administration Guidelines

Calcort is a prescription corticosteroid that is administered via the oral route, with both tablets and a liquid suspension available. The primary dosing principle, as defined for Duchenne muscular dystrophy (DMD) in patients 5 years of age and older, is based on a daily weight calculation: 0.9 mg/kg of body weight, administered once daily.


Administration Details and Procedural Constraints

The medication can be taken with or without food. For proper administration, the specific form dictates preparation: tablets may be taken whole or crushed and mixed with applesauce. The oral suspension must be accurately measured using a calibrated device and mixed with a non-grapefruit juice or milk before immediate ingestion.

This medication is typically intended for long-term therapy, and if the drug is used for more than a few days, the dosage is gradually decreased before discontinuation to allow for safe cessation. This is a standard procedural constraint of use. Furthermore, if Calcort is used alongside certain other medications (moderate or strong CYP3A4 inhibitors), the dose is reduced to one-third of the original calculation.


Frequency and Missed Doses

Consistent once daily administration is required. If a dose is missed, it is typically taken as soon as it is remembered; however, if it is almost time for the next scheduled dose, the missed dose is skipped and the regular schedule is resumed. No dose adjustment is specified for mild-to-moderate hepatic or renal impairment.

Recent Clinical Evidence

Research evidence / Overview of Studies for Calcort

Evidence for Use in Duchenne Muscular Dystrophy (DMD)

The clinical evaluation of Calcort for DMD is described by short-term randomized controlled trials (RCTs) (typically 12 to 52 weeks) and longer-term observational studies. Research primarily examined outcomes related to functional abilities and muscle strength in ambulatory male pediatric patients aged 5 years and older. In these trials, participants were compared to those taking a placebo or another corticosteroid. Studies reported changes measured during the study period, such as average motor function scores and measurements from timed functional tests (like the 6-minute walk distance), with findings describing measured differences in the patterns of functional abilities when compared to the placebo group.

Comparative Studies against Other Steroids and Long-Term Follow-up

Several analyses, including meta-analyses and retrospective reviews, examined outcomes between Calcort and other standard corticosteroids. These studies focused on comparing patterns in timed functional tests and long-term event progression, such as the age at which loss of independent ambulation (LoA) was recorded. Findings varied across studies, with some reporting measured functional outcomes. Other studies focused on systemic or functional imbalance over longer periods, reporting on differences in bone mineral density or body weight gain between the treatment groups. Evidence derived from long-term observational settings reported an association between Calcort use and the measured age of LoA compared to historical cohorts.

Evidence for Other Inflammatory Conditions and Limitations

Calcort was also evaluated in research contexts involving other conditions, such as rheumatoid arthritis, where the focus was often on comparative impact on metabolic markers. Studies reported comparable anti-inflammatory activity to other steroids in some patients, but evidence is limited for long-term disease modification outcomes. The research has mainly described patterns of impact on glucose and bone metabolism. The overall research landscape contains limitations: sample sizes were modest in some pivotal RCTs, follow-up durations were limited for long-term functional outcomes, and data for certain groups remain insufficient. Conclusions about long-term progression rely heavily on observational data, which limits the certainty of absolute long-term outcomes.

Frequently Asked Questions (FAQ)

Common questions about Calcort (FAQ)

Q: What is the main reason doctors prescribe Calcort?

Calcort (deflazacort) is a corticosteroid medication. According to official documents, it is primarily approved for the treatment of Duchenne muscular dystrophy in patients who are 2 years of age and older. Its general purpose is described as providing broad anti-inflammatory and immune-modulating effects.

Q: How long does the effect of Calcort usually last in the body?

Calcort is described in official documents as a prodrug, meaning it must first be converted into its active form, 21-desacetyldeflazacort, to begin working. Pharmacokinetic studies have examined the half-life of this active form, which gives an indication of how long the drug exerts its main biological influence in the body.

Q: Does Calcort interact with common pain relievers like ibuprofen?

Official information indicates that taking Calcort alongside Nonsteroidal Anti-inflammatory Drugs (NSAIDs), such as ibuprofen, may increase certain safety risks. This combination can increase the potential for gastrointestinal side effects, including ulceration or bleeding. This combination is noted in official documentation due to the potential for increased risk.

Q: What type of blood tests might a doctor ask for while someone is on Calcort?

Regulatory warnings mention the need for monitoring to detect signs of potential metabolic imbalances that can occur with corticosteroid use. This monitoring may include checks for high blood sugar (hyperglycemia), elevated blood pressure, and adrenal gland suppression.

Q: Does Calcort affect sleep patterns?

Yes, official safety information mentions that behavioral and mood disturbances have been reported with deflazacort use. Specifically, these reports have included issues such as insomnia (difficulty sleeping).

Q: Does Calcort have known interactions with common herbal supplements?

The active form of Calcort is processed by a liver enzyme called CYP3A4. Any product—including certain herbal supplements—that strongly or moderately affects this enzyme could change the amount of Calcort in the body. Official guidance notes that the use of strong inhibitors or inducers of this enzyme may necessitate dose adjustment or be advised against.

Q: Why is Calcort sometimes prescribed when other steroid treatments have not worked?

The decision to prescribe a specific medication is a clinical one. Studies have examined Calcort’s profile and noted that it may be associated with observed differences in metabolic impact, such as on bone mineral density or body weight gain, compared to some other corticosteroids. These differences are noted in medical literature when comparing long-term treatment options.

Q: What should a patient do if they accidentally take too much Calcort?

Official prescribing information indicates that severe consequences from taking an acute, single overdose are generally rare. Nevertheless, in the event an accidental overdose is suspected, the patient’s healthcare provider or emergency services should be informed.

Q: Can Calcort affect a patient's ability to drive or operate machinery?

Regulatory documents state that no specific studies focusing on the effects of Calcort on a patient’s ability to drive or use machinery have been conducted.

Q: What is the process for switching from another steroid to Calcort?

Official guidelines describe the procedure for switching a patient from another corticosteroid to Calcort. If the previous steroid was taken for more than a few days, official documents describe the need for a gradual decrease in dosage before stopping, which is essential for managing the risk of adrenal insufficiency. The new Calcort dose is then started as calculated based on the patient's weight.

Q: How is the need for Calcort reviewed over time by a healthcare provider?

Patients on long-term therapy with Calcort require ongoing review, as noted in the official warnings and precautions. This monitoring addresses potential systemic changes, including checking blood pressure, bone health, blood sugar, and the function of the adrenal gland.

Q: What is the main difference between how Calcort and prednisone are structured as drugs?

Calcort (deflazacort) is classified as a heterocyclic glucocorticoid prodrug, a type of oxazoline steroid. This unique chemical structure, compared to older drugs like prednisone, is noted in clinical reviews to potentially result in a lower metabolic impact on carbohydrate and calcium processes.

Q: Why is Calcort used for Duchenne muscular dystrophy?

Calcort functions as a corticosteroid, primarily by reducing inflammation and suppressing immune activity. In clinical studies, this action has been associated with maintaining or improving muscle strength and functional abilities in patients with Duchenne muscular dystrophy.

Q: Is Calcort the same as other steroid drugs, or is it different?

Calcort is in the same class as other corticosteroids (glucocorticoids), but it is chemically an oxazoline derivative of prednisolone. Clinical research and official information suggest it may have certain differences in its metabolic profile, such as a potentially reduced impact on bone and carbohydrate metabolism.

Q: Is Calcort safe to take if I have diabetes?

Corticosteroids, including Calcort, are known to have the potential to increase blood glucose levels. This effect can worsen pre-existing diabetes or lead to new-onset diabetes. Regulatory guidance indicates that patients with diabetes will require close blood glucose monitoring. Changes to anti-diabetic treatment may be needed, as described in the official prescribing information.

Q: Is it normal to feel more energetic or restless after starting Calcort?

Official documents describe that deflazacort use has been associated with behavioral and mood disturbances. These reported effects include euphoria (a feeling of intense well-being), mood swings, and insomnia.

Q: Is Calcort known to affect the growth rate in children?

Corticosteroids generally can affect the rate of growth in children. However, clinical reviews involving children on chronic steroid therapy have suggested that deflazacort may be associated with observed differences in growth rate compared to certain other corticosteroids.

Q: Does Calcort use need to be monitored closely if a patient has a history of heart problems?

Due to Calcort's effect on fluid and electrolyte balance, official documents describe the need for close monitoring. Deflazacort use has been associated with elevated blood pressure and fluid retention, effects that could potentially worsen existing cardiovascular conditions.

Q: Are there any gender-specific concerns or side effects noted for Calcort?

Official documents on adverse reactions indicate that some side effects are relevant to gender. For example, hirsutism (unwanted hair growth) and irregularities in menstrual periods (amenorrhea) have been reported with the use of deflazacort.

Q: Does the time of day matter when taking Calcort?

The official documentation requires the medication to be administered once daily. While a specific time is not mandated, clinical practice often suggests taking corticosteroids in the morning. This schedule is generally intended to align the timing of the dose with the body's natural production of cortisol.

How should Calcort be stored and disposed of?

Storage and Disposal Requirements for Calcort (Deflazacort)

The storage conditions for deflazacort are defined by the regulatory body and vary slightly by dosage form. Calcort Tablets must be stored below 25°C (77°F) and kept in their original package.

The EMFLAZA Oral Suspension must be stored at controlled room temperature (20°C to 25°C), with the bottle stored upright and the cap tightly closed. A critical stability requirement is that any unused oral suspension must be discarded one month after the date the bottle was first opened.

All forms of the medication must be stored out of the sight and reach of children.

Disposal

Official disposal guidance advises that unused Calcort tablets should be returned to a pharmacist for safe disposal. The medicine must not be disposed of via wastewater or general household waste.

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

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