Trego

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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 Trego

Quick Facts

Property Description
Active ingredient Mupirocin Calcium (INN)
Form Topical preparations (Ointment, Cream)
Pharmacological class Topical Antibacterial Agent / Protein Synthesis Inhibitor
Route of administration External use only
Origin Naturally-occurring antibiotic

What Type of Medicine is Trego?

Trego is a prescription medicine classified as a Topical antibiotic and Antibacterial agent, intended strictly for external application to the skin surface via the Topical route. The active pharmaceutical ingredient is Mupirocin Calcium, which is the stable calcium salt form of the mupirocin compound. The active substance is categorized as an RNA Synthetase Inhibitor Antibacterial, highlighting its focused therapeutic method. This focused classification underscores that Trego is clinically recognized for its localized effect against susceptible organisms in skin applications.

Composition and General Purpose

The active component, Mupirocin, is a unique, naturally-occurring antibiotic derived from the microorganism Pseudomonas fluorescens. This origin grants it a distinct monoxycarbolic acid structure that sets it apart from many other antimicrobial classes. Trego is commonly supplied in forms such as a 2% w/w Ointment or Cream, where the active drug is carried in a neutral base to ensure localized delivery. The general purpose of this medicine is to address bacterial skin issues by stopping bacteria from producing the necessary proteins for survival; this unique mode of action gives it a therapeutic advantage by avoiding cross-resistance with other major antibiotic drug classes. This mechanism means the medicine is specifically designed to target superficial bacterial proliferation.

What side effects are possible with Trego?

The official safety profile for Trego (Mupirocin) primarily documents adverse reactions classified by their frequency and the physiological system affected. Most reactions are localized to the area of application.

Frequency-Classified Adverse Reactions

The most frequent events reported in regulatory documentation fall into the Common and Uncommon categories, reflecting reactions at the skin and subcutaneous tissue level.

Classification Examples of Documented Reactions
Common (1/100 to <1/10) Burning localized to the application area, itching (pruritus), erythema (redness).
Uncommon (1/1,000 to <1/100) Stinging, dryness, cutaneous sensitisation reactions.
Very Rare (<1/10,000) Systemic allergic reactions.

Serious Adverse Reactions and Constraints

Although rare, systemic events are officially documented. Serious adverse reactions include systemic allergic reactions, such as anaphylaxis and angioedema, as well as Clostridium difficile-Associated Diarrhea (CDAD), which can occur during or following the use of nearly any antibacterial agent.

Treatment is contraindicated in patients with a history of hypersensitivity to mupirocin or any excipient. If severe local irritation or a sensitization reaction occurs, the regulatory label requires that treatment be discontinued.

Population-Specific Safety Note

There is a specific safety consideration for the ointment formulation, which contains Polyethylene Glycol (PEG). Because PEG can be absorbed from open wounds or damaged skin and is excreted by the kidneys, the ointment should not be used in conditions where large amounts of PEG absorption are possible, particularly if there is evidence of moderate or severe renal impairment. For the pediatric population, the frequency and type of adverse reactions are reported to be comparable to those in adults.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory documentation on Trego (Mupirocin topical preparations) indicates that clinical experience with overdosage is limited, and the toxicity of the active drug is very low upon systemic exposure due to rapid metabolism.

Overdose is primarily discussed in the context of accidental ingestion of the ointment or its extensive use on large areas of damaged skin. In these situations, the critical consideration is the polyethylene glycol (PEG) excipient present in the ointment base.

Systemic absorption of large quantities of this PEG excipient can pose a risk of nephrotoxicity (kidney damage), particularly in patients with pre-existing renal impairment. Official prescribing information requires that these patients receive close monitoring of renal function following large exposures.

Due to the lack of a specific antidote, regulatory guidance mandates that management for overdosage is symptomatic and supportive. In the event of accidental ingestion of the ointment, immediate medical attention must be sought, and a healthcare practitioner or national poisons centre should be contacted for urgent clinical direction.

Therapeutic Uses of Trego

What Trego Treats: Main Uses and Benefits

Trego (Mupirocin) is commonly used for managing primary bacterial skin infections, such as impetigo, and other localized infections caused by susceptible bacteria. This medicine is applied in contexts where additional symptomatic support is needed to address visible manifestations like honey-colored crusts, pustules, and weeping lesions.

The primary therapeutic use is in managing the active infection, which may assist in limiting the local spread of contagious conditions, which are common in younger patient groups. This medicine is also relevant in clinical scenarios where minor traumatic skin lesions (cuts or scrapes) become complicated by secondary bacterial infection. This topical application helps with easing the associated localized inflammatory discomfort, which often includes redness, tenderness, and stinging, thereby contributing to easing the overall symptom load.


Key Therapeutic Focus: Relief for Localized Discomfort

Feature Description
Primary Indication Impetigo, an example of a superficial bacterial infection.
Symptom Focus Visible lesions (crusting, pustules), redness, and localized tenderness.
Patient Benefit Contributes to easing the overall symptom load during acute episodes.

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Who Can and Cannot Use Trego? Official Regulatory Information

Official regulatory documents define strict eligibility rules for the use of Trego (Mupirocin topical), focusing on absolute prohibitions and restrictions based on patient characteristics and clinical state.

Contraindications and Restrictions

Category Regulatory Status Description
Hypersensitivity Contraindicated Patients with known allergy to mupirocin or any excipient must not use Trego.
Renal Function Restricted Use The polyethylene glycol-based ointment requires caution for patients with moderate or severe renal impairment when applied to large areas of damaged skin.
Application Site Contraindicated Use is prohibited for ophthalmic, intranasal, or at the site of central venous cannulation.

Age and Physiological Eligibility

Population Group Ointment Eligibility Status Cream Eligibility Status
Infants Not established under 2 months Not established under 3 months
Pregnant Women Conditional Use Permitted only when the potential benefit outweighs the risk due to insufficient human data.
Nursing Mothers Use with Caution The treated area must be thoroughly washed before breastfeeding.

These official statements establish the populations for whom Trego use is strictly forbidden or requires specific caution, ensuring the focus remains on documented eligibility status.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information for Trego (Mupirocin topical preparations) indicates a very limited systemic interaction profile due to the medicine's minimal absorption into the bloodstream after external application.


Documented Interaction Constraints

Constraint Type Official Regulatory Statement
Concurrent Topical Use Trego should not be applied concurrently with any other lotions, creams, or ointments to the same treatment area.
Systemic Drug Interactions No specific systemic drug-drug interactions are documented; the effects of concurrent use with other drug products are generally stated as not studied by regulators.

Excipient-Related Caution (Ointment Only)

Population / Condition Interaction Note
Renal Impairment The polyethylene glycol excipient in Mupirocin ointment can be absorbed through damaged skin. Caution is advised for patients with moderate or severe renal impairment if the ointment is applied to large quantities of open wounds or damaged skin, as this increases the risk of excipient accumulation.

Contraindicated Combinations: The official prescribing information does not list any specific systemic medicines that are formally prohibited for co-administration with Trego topical preparations. The only formal contraindication is known hypersensitivity to the drug or its inactive ingredients.

Food, Alcohol, and Supplements: Regulatory labels do not document any specific interactions between topical Mupirocin and food, alcohol, or dietary supplements.

Mechanism of Action

Modulation of Key Receptor-Mediated Signaling

Trego operates within domains involving receptor- or enzyme-mediated signaling pathways critical to physiological regulation. It selectively initiates or suppresses signaling sequences that lead to specific downstream effects, modulating overactive or dysregulated cellular processes. This results in a modulated physiological response at the cellular level.


Regulation of Metabolic Pathways

The drug engages systems where specific transmitters or mediators dominate, such as those governing glucose and lipid metabolism. By modifying early molecular steps, Trego influences signaling sequences governing metabolic pathways, leading to resultant downstream physiological adjustments.


Engagement of Anti-Inflammatory Cascades

Trego influences mechanisms that regulate overactive or dysregulated inflammatory processes. It modifies signaling sequences through inhibiting signaling sequences to modulate pro-inflammatory factor release and influence the propagation of inflammatory pathways. This results in altered signaling dynamics within targeted inflammatory pathways.

Dosage and Administration Information

How Trego is Used

Trego (Mupirocin) is used exclusively for external application to the skin, following highly standardized instructions for dosing, frequency, and duration.


Administration and Dosing Schedule

Feature Official Instruction
Route of Administration Topical (Cutaneous) use only.
Dose Apply a small amount to completely cover the affected area.
Frequency Apply three times daily (approximately every 8 hours).

The official dosage forms are a 2% w/w Ointment for treating impetigo and a 2% w/w Cream for secondarily infected traumatic skin lesions.


Treatment Duration and Specific Conditions

Treatment must be continued for the full prescribed period, typically up to 10 days. If no clinical response is observed within 3 to 5 days, the prescribing healthcare provider should re-evaluate the treatment plan.

  • Administration: The treated area may be covered with a sterile gauze dressing if desired. The medicine must not be mixed with other topical preparations, as this may compromise its efficacy and stability. It is also restricted from use at central intravenous sites.

Population-Specific Constraints

While Trego is approved for pediatric use, the minimum age varies by form: the Ointment is established for children ge 2 months of age, and the Cream for children ge 3 months of age. A significant constraint exists for patients with kidney problems: the Ointment formulation should not be used on extensive, open wounds in those with moderate or severe renal impairment due to the potential absorption of its polyethylene glycol excipient.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Trego

Evidence for Use in Primary Bacterial Skin Infections (Impetigo)

The clinical evaluation of Trego primarily relies on Randomized, Controlled Clinical Trials (RCTs). These short-term RCTs were designed to compare Trego with an inactive base (the vehicle) and with other standard antibiotic treatments, both topical and oral. The main focus of this research was to monitor how symptoms evolved in the observed populations during the study period.

Researchers used defined criteria to measure two key outcomes. The first was Clinical Success, which was evaluated by doctors assessing the clearing or progression of visible lesions, such as crusting and blistering, using rating scales. The second outcome was Bacteriological Success, where laboratory tests evaluated the rates of bacterial clearance, primarily Staphylococcus aureus and Streptococcus pyogenes, at the infection site. These studies focused on patients with uncomplicated, localized infections.

Evidence for Use in Secondary Infected Traumatic Skin Lesions

Research explored Trego in studies involving conditions associated with acute or disruptive episodes of secondary bacterial infection of minor traumatic skin lesions, such as small cuts, scrapes, or sutured wounds. These studies also used controlled trial designs, comparing Trego to an inactive vehicle or a reference comparator treatment.

Research describes how studies monitored the outcomes related to physical discomfort and outcomes linked to inflammatory or irritative states. The research highlights changes measured during the study period, focusing on the clinical progress of the infection and whether the bacteria were evaluated for clearance. Follow-up durations were limited for this indication.

What Is Still Uncertain About Trego

The evidence landscape for Trego is primarily built on short-term research. Consequently, there is limited information for long-term outcomes regarding the use of Trego. Long-term effects are not fully established because the studies were not designed to monitor patients over many months or years. The existing studies provide limited insight into the use of Trego for infections that are systemic, deep, or extensive, as the trial protocols specifically focused on uncomplicated, superficial, and localized skin infections.

Key Studies & References

  1. Mupirocin - StatPearls (NCBI Bookshelf)

Frequently Asked Questions (FAQ)

Common questions about Trego (FAQ)


Q: Is Trego considered a long-term or short-term treatment?

According to official regulatory documents, Trego is intended for short-term use. Treatment is typically limited to a period of up to 10 days for the approved conditions.


Q: Is Trego known to cause weight changes?

Official product information on Trego, a topical medicine, does not commonly list weight changes among its documented adverse reactions. This suggests that weight change is not a frequently reported side effect.


Q: Can Trego be used in children or teenagers?

Yes, Trego has established use in the pediatric population. The ointment formulation is established for children as young as 2 months of age, and the cream formulation for children as young as 3 months of age, supporting its use in older children and adolescents as well.


Q: What should be done if someone stops taking Trego suddenly?

Official patient information emphasizes the importance of completing the full course of Trego as prescribed to help ensure the infection is fully cleared. If a person is considering stopping treatment, official guidance recommends seeking advice from a healthcare professional.


Q: Are the initial side effects of Trego usually temporary?

Regulatory documents indicate that if severe local irritation or a sensitization reaction occurs, the medicine should be discontinued. For common, milder reactions like burning or stinging, the documents do not specify a typical duration, but such localized effects for topical medicines are often observed to be short-lived.


Q: Can Trego be taken with supplements or herbal products?

The official regulatory labels for Trego do not document specific interactions with supplements or herbal products. This is attributed to the medicine’s minimal systemic absorption into the bloodstream.


Q: Are there any lifestyle changes suggested when using Trego?

Official regulatory guidelines include a few practical notes for use. The treated area may be covered with a sterile gauze dressing if desired, and patients are advised to wash their hands before and after applying the medicine to maintain hygiene.


Q: What is the storage temperature requirement for Trego?

Trego must be stored at what is termed Controlled Room Temperature, which is specified as being between 20 C to 25 C (68 F to 77 F). The product should be kept in its original container and protected from excess heat, moisture, and light.


Q: Are there restrictions on consuming alcohol while on Trego?

The official regulatory label for Trego, a topical medicine, does not document any specific interactions with alcohol consumption.


Q: What is the typical time frame for follow-up appointments after starting Trego?

Regulatory instructions advise that patients who are not showing clinical progress within 3 to 5 days of starting treatment should seek a re-evaluation from their healthcare provider. This timeframe suggests when initial therapeutic progress is typically expected.


Q: What happens if someone takes Trego in a higher amount than prescribed?

Due to its topical route of administration, minimal amounts of Trego are absorbed into the bloodstream. Specific information on overdose is not commonly detailed in the labeling due to the minimal risk of systemic absorption.


Q: Does Trego have a risk of dependence or addiction?

Trego is not classified as a federally controlled substance, and regulatory documents do not list any risk of physical or psychological dependence or addiction for this medicine.


Q: Are there any common foods or drinks that should be avoided when taking Trego?

The official regulatory label for topical Trego does not document any specific interactions with food or drinks, as its route of administration limits systemic exposure.


Q: How long does it usually take before a person notices the effects of Trego?

While regulatory documents do not state a precise onset time, they advise that if a patient does not show improvement after 3 to 5 days of use, the treatment should be re-evaluated. This indicates that some clinical progress is generally anticipated within that initial period.


Q: Why is Trego only available by prescription?

Trego is labeled as 'Rx Only' (prescription only) because it is an antibacterial agent. Prescription is required to ensure it is used appropriately for diagnosed bacterial infections and to help manage the risk of developing resistance to the antibiotic.


Q: Is there a limit to how long Trego can be used?

The maximum duration for a single course of treatment is specified as up to 10 days. Regulatory information warns that prolonged or repeated use may result in the overgrowth of organisms that are not affected by the medicine, including fungi.


Q: Do older adults typically need different considerations when taking Trego?

Official documents state that no specific geriatric-related problems have been demonstrated in studies related to the Trego cream. However, for the ointment, there is no specific information on the relationship of age to the effects in the geriatric population.


Q: What is the general profile of people who are eligible to take Trego?

Trego is indicated for the topical treatment of specific bacterial skin infections, such as those caused by susceptible strains of Staphylococcus aureus and Streptococcus pyogenes. It is only for use in patients diagnosed with these conditions.


Q: Is Trego considered a Schedule/Controlled substance?

No, regulatory labeling indicates that Trego is not categorized as a federally scheduled or controlled substance.


Q: What part of the body does Trego primarily act on?

Trego is a topical medicine intended exclusively for use on the skin. It acts locally at the application site to target the bacteria causing the skin infection.


Q: What is the difference between Trego and its generic version (if one exists)?

Regulatory bodies have determined that a generic version of Trego (mupirocin) is bioequivalent and therapeutically equivalent to the brand-name drug. This means that, by regulatory standards, they are considered to have the same clinical effect and safety profile when used as directed.


Q: Can Trego affect mood or mental state?

The documented adverse reactions for Trego primarily involve localized skin effects (like burning or itching). Changes in mood or mental state are not listed among the commonly reported systemic adverse effects in official documents.


Q: Does Trego require special monitoring tests during treatment?

For most patients, no special monitoring is required. However, monitoring may be advised for specific individuals, particularly those with moderate or severe kidney problems who apply the ointment formulation to large areas of damaged skin.


Q: Is it possible to be allergic to Trego?

Yes, Trego is strictly contraindicated, or prohibited, in anyone with a known history of hypersensitivity (allergy) to the active ingredient or any of its inactive components. Serious systemic allergic reactions have been reported, although rarely.


Q: Is there any research on Trego and liver function?

Because systemic absorption of topical Trego is minimal, specific recommendations for individuals with hepatic impairment (liver function issues) are generally not detailed in the official regulatory labeling.


Q: Can Trego interact with birth control pills?

The official information states that the effects of concurrent use with other drug products are unknown, as is the case for many topical medicines. The medicine is minimally absorbed systemically.


Q: Why do some people feel worse when they first start taking Trego?

The label reports common local adverse reactions at the application site, such as burning, stinging, itching, or pain, which may contribute to discomfort when starting treatment.


Q: Does Trego have a known effect on laboratory test results?

Trego does not commonly affect laboratory tests. However, the inactive ingredient polyethylene glycol, found in the ointment, may necessitate monitoring of renal (kidney) function panels if the product is applied extensively to large, open wounds.


Q: Are there any long-term health concerns associated with using Trego?

The research supporting Trego's use is based primarily on short-term studies related to its approved indication. Because of this, official documents state there is limited information available on long-term outcomes or health concerns associated with its use over extended periods.

How should Trego be stored and disposed of?

Trego (Mupirocin) must be stored and disposed of according to official regulatory guidelines to maintain its stability and ensure safety.

Storage Requirements

The product must be stored at Controlled Room Temperature, specifically between 20 C to 25 C (68 F to 77 F). The medicine must be kept in its original container, tightly closed, and protected from excess heat, moisture, and direct light. It is prohibited to freeze the product. For stability, the official in-use shelf life for the product after first opening is typically 10 days.

Child-Safety Storage

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

Disposal Instructions

Any unused or expired Trego must be disposed of in accordance with local requirements, preferably utilizing a drug take-back program. If a take-back option is unavailable, the product should be mixed with an undesirable substance (such as dirt or coffee grounds), sealed in a bag, and then placed in the household trash.

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

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