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Septrin Pediatrico

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Septrin Pediatrico

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.

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Overview of Septrin Pediatrico

Property Description
Active ingredient Sulfamethoxazole and Trimethoprim (Co-trimoxazole)
Form Oral Suspension or Syrup
Pharmacological class Broad-spectrum Antibacterial Agent
Common use Systemic bacterial infections
Origin Synthetic (Chemically synthesized)

What Type of Medicine is Septrin Pediatrico?

Septrin Pediatrico is a prescription-only medicine defined by its two active compounds, Sulfamethoxazole and Trimethoprim, which together constitute the International Nonproprietary Name (INN) Co-trimoxazole. This drug is classified as a broad-spectrum antibacterial agent and is a fixed-dose combination product intended for systemic administration. The drug entity is entirely synthetic in origin and is routinely included on the World Health Organization's (WHO) Model List of Essential Medicines, confirming its global importance for public health needs.


Composition and Form: The Co-trimoxazole Entity

The medicine is specifically formulated as an oral suspension or syrup, utilizing an aqueous vehicle base, which differentiates it from adult solid dosage forms. The designation Pediatrico means that this preparation is specialized for use in the infant and child target audience. It is manufactured in a liquid form to facilitate accurate and convenient oral administration for pediatric patients. The two components work together to achieve a synergistic effect by inhibiting sequential steps in the bacterial folate synthesis pathway.


General Purpose of this Antibacterial Combination

The general purpose of this combination is to achieve synergistic and robust bactericidal action to combat microbial growth throughout the body. The combination of Sulfamethoxazole and Trimethoprim is employed because the two agents target the production of the vital nutrient folic acid. By blocking this metabolic process essential for bacterial replication, the active ingredients effectively prevent the proliferation of organisms responsible for various systemic bacterial infections, which is the typical use scenario for this antimicrobial combination.

Regulatory References

  1. Trimethoprim Sulfamethoxazole StatPearls
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What side effects are possible with Septrin Pediatrico?

Possible Side Effects and Safety Information

The official safety profile of Septrin Pediatrico (Co-trimoxazole) is systematically classified by regulatory authorities to communicate potential risks. Adverse reactions are grouped by the body system affected and by their documented frequency.


Adverse Reaction Classification

The active components, Sulfamethoxazole and Trimethoprim, are associated with adverse effects categorized across several System-Organ Classes. These include Blood and Lymphatic System Disorders (e.g., leukopenia, thrombocytopenia), Skin and Subcutaneous Tissue Disorders (e.g., rash), and Gastrointestinal Disorders (e.g., nausea, diarrhea).

Very Common reactions documented in regulatory sources include hyperkalaemia. Other common reactions are nausea, diarrhea, and skin rash.


Serious Adverse Reactions and Safety Constraints

Regulatory labeling highlights specific rare but serious adverse reactions. These include Severe Cutaneous Adverse Reactions (SCARs), such as Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), as well as severe blood disorders like agranulocytosis and aplastic anemia.

Safety restrictions apply to certain patient populations. The medicine is formally contraindicated in individuals with severe hepatic impairment or severe renal impairment where kidney function cannot be properly monitored. Additionally, official safety notes indicate that older adults may have an increased risk of severe reactions, and some effects, such as severe skin reactions, may be more likely to appear early in the course of treatment.

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Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory documents for the combination of Sulfamethoxazole and Trimethoprim (Co-trimoxazole) define the specific clinical manifestations and mandated emergency actions in case of overdose.

Documented Clinical Manifestations

Overdose may present with gastrointestinal symptoms such as nausea, vomiting, and loss of appetite. Central Nervous System (CNS) effects are also documented, including dizziness, confusion, and potential loss of consciousness. Other documented signs may involve systemic effects like fever and indications of organ involvement, such as jaundice (yellowing of the skin or eyes) or the presence of blood in the urine (hematuria). Serious outcomes, including seizure, collapse, trouble breathing, or severe electrolyte abnormalities like hyperkalemia, require immediate attention.

Emergency Actions Mandated by Regulators

It is mandatory to seek immediate medical attention or call the Poison Help line upon any suspected overdose. Emergency medical services must be contacted immediately if severe signs occur, such as experiencing a seizure, collapse, or inability to be awakened. In the event of an overdose, no specific chemical antidote is documented; therefore, management involves providing symptomatic and supportive treatment. Procedural steps like gastric lavage may be considered. Regulators note that toxicity is exacerbated in patients with severely impaired renal function, who exhibit an increase in the clearance half-lives of both active components.

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Therapeutic Uses of Septrin Pediatrico

What Septrin Pediatrico Treats: Main Uses and Benefits

Septrin Pediatrico, a combination of sulfamethoxazole and trimethoprim, is considered relevant in situations involving certain distressing symptoms caused by susceptible bacteria. This medication is generally used across conditions presenting with acute or disruptive episodes, providing supportive relief that helps ease the overall symptom burden.

The medication is commonly applied in clinical settings that involve acute or unstable symptom patterns, such as those associated with Urinary Tract Infections (UTIs), Acute Otitis Media (middle ear infections), Shigellosis (gastrointestinal infections), and conditions like Pneumocystis Jirovecii Pneumonia (PJP/PCP).

The overall goal is to help maintain a sense of stability when symptoms are more noticeable. This combination is considered relevant in addressing these types of bacterial conditions.

The supportive role is often described as:

“It offers symptomatic relief that helps patients cope more steadily during periods where symptoms become temporarily overwhelming.”


Quick Fact: Relief for Symptoms Related to Inflammatory or Irritative States

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Eligibility and Restrictions for Use

Who Can and Cannot Use Septrin Pediatrico?

The population eligibility for using Septrin Pediatrico (Co-trimoxazole oral suspension) is strictly governed by regulatory classifications, defining who can use the medicine and who must not. This information is based on official government labeling, such as FDA and EMA documents.

Contraindicated Populations (Must Not Use)

Use is contraindicated in patients with a known hypersensitivity to trimethoprim, sulfamethoxazole, or any sulfonamide. It is also prohibited for those with marked hepatic damage, severe renal insufficiency when monitoring is not possible, acute porphyria, or megaloblastic anemia due to folate deficiency.

Age and Physiological Restrictions

Age Group / Status Eligibility Status
Infants Contraindicated for children less than 2 months of age (FDA) or during the first six weeks of life (SmPC).
Pregnancy/Lactation Not recommended or avoided, especially near term or while breastfeeding, due to the risk of kernicterus in the infant.

Conditional Use and Special Care

Use requires special care in older patients and those with conditions like impaired renal function (Creatinine Clearance 15-30 mL/min), which requires a dosage reduction to half the standard dose. Use is generally not recommended for severe renal impairment (CrCl < 15 mL/min).

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What should I know about interactions with other medicines?

Interactions with other medicines and products

Septrin Pediatrico (co-trimoxazole, a combination of sulfamethoxazole and trimethoprim) can interact with several medicinal products, potentially requiring dose adjustments or increased monitoring.

Interacting Product Category Example Medicines Interaction Outcome
Cardiovascular/Antiarrhythmic Dofetilide, Clozapine Contraindicated (high risk of serious arrhythmias/blood disorders)
Anticoagulants Warfarin Increased blood-thinning effect (risk of bleeding). Requires close monitoring of INR.
Antifolate Agents Methotrexate Increased risk of severe bone marrow suppression. Concurrent use should be avoided.
Anticonvulsants Phenytoin Increased phenytoin levels due to impaired metabolism. Requires therapeutic drug monitoring.
Antidiabetics Sulfonylureas (e.g., glibenclamide) Increased risk of low blood sugar (hypoglycemia). Requires increased blood glucose monitoring.
Potassium-Elevating Agents ACE Inhibitors, Potassium-sparing Diuretics Increased risk of high potassium levels (hyperkalemia), particularly in the elderly.

Trimethoprim can increase the blood levels of certain medicines, such as Digoxin, by inhibiting its renal excretion, especially in older patients. Additionally, caution is advised when co-administering with Ciclosporin due to a potential for additive kidney toxicity, necessitating frequent drug level checks. Patients should ensure their healthcare provider is aware of all medicines, supplements, and vitamins being taken to manage these risks effectively.

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Mechanism of Action

Dual Enzyme Inhibition and Synergistic Blockade

Septrin Pediatrico, a combination of Sulfamethoxazole (SMX) and Trimethoprim (TMP), functions by a sequential double blockade of bacterial folate metabolism. This mechanism involves targeting two distinct enzymes required for the bacteria to produce tetrahydrofolate (THF). SMX acts as a competitive inhibitor of dihydropteroate synthase (DHPS), and TMP acts as a non-competitive inhibitor of dihydrofolate reductase (DHFR).

This combined action achieves synergism: the initial blockage by SMX reduces the substrate available for the second enzyme, increasing the efficiency of DHFR inhibition by TMP. The resulting lack of THF prevents the bacteria from synthesizing the purine and pyrimidine building blocks for DNA and RNA. This halts the bacterial cell cycle and leads directly to bactericidal action (killing of the organism).

Selective Toxicity

The mechanism exhibits selective toxicity because host (human) cells do not possess the targeted DHPS and DHFR enzymes, relying instead on pre-formed dietary folate. This biological difference confines the drug's action primarily to the pathogenic microorganisms, without inhibiting host cellular processes.

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Dosage and Administration Information

Official Administration Guidelines for Septrin Pediatrico

Septrin Pediatrico (co-trimoxazole oral suspension) is a combination product used by the oral route. Usage must strictly follow the prescription regarding dose, frequency, and duration of treatment, as defined in official regulatory labeling.


Dosing and Administration

Parameter Official Instruction (Regulatory Basis)
Route of Administration Oral (by mouth)
Dosing Schedule (Standard) Approximately 6 mg trimethoprim (TMP) and 30 mg sulfamethoxazole (SMX) per kg of body weight daily, given in two equally divided doses.
High-Dose Regimen For certain severe infections, the dose is higher, using 15 to 20 mg TMP and 75 to 100 mg SMX per kg of body weight daily, administered in two or more divided doses (e.g., every 6 or 8 hours).
Frequency Typically twice daily (every 12 hours) for standard treatment.
Age Restriction Contraindicated in pediatric patients less than 2 months of age.
Preparation Shake the liquid well before each use to ensure the medication is evenly mixed.
Timing in Relation to Meals May be administered with or without food.
Special Condition Adequate fluid intake (e.g., several additional glasses of water) must be maintained throughout the treatment course to ensure proper renal elimination.
Duration Treatment should continue until the patient has been symptom-free for two full days; the majority of standard courses require a minimum of five days of continuous therapy. For high-dose regimens, the duration may extend up to 14 to 21 days.

Procedural Structure

The official usage protocol requires the precise mL dose to be calculated based on the child's body weight and then administered orally every 12 hours (or more frequently for high-dose treatment) after shaking the bottle. The full prescribed course must be completed, and patients with impaired renal function require a 50% dosage reduction if the creatinine clearance is between 15 and 30 mL/min.

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Recent Clinical Evidence

Research Evidence / Overview of Studies for Septrin Pediatrico

The research available for Septrin Pediatrico (Co-trimoxazole) focuses on its clinical evaluation in children for specific types of systemic bacterial infections. The available evidence consists mainly of Randomized Controlled Trials (RCTs), Meta-analyses, and Comparative Clinical Trials that monitor how symptoms evolve in the observed populations. Research does not determine whether an individual will respond similarly; study results reflect the specific conditions under which they were conducted.


Evidence for Use in Pneumocystis Jirovecii Pneumonia (PJP/PCP) Prophylaxis

PJP Prophylaxis represents a primary focus of the research for this medicine, which is an infection that may occur in children with compromised immune systems. The research examined PJP episodes in immunocompromised populations as a prophylactic target. Studies monitored patient outcomes related to overall mortality rates, the rate of developing a PJP infection, and the frequency of other severe bacterial infections. Infants and children exposed to or infected with HIV represent a common population observed in research for this indication.

Evidence for Use in Urinary Tract Infections (UTIs)

For Urinary Tract Infections (UTIs), research focused on treating acute episodes and was studied for its use as a prophylactic measure (prevention). Comparative Clinical Trials evaluated the medicine against established treatments in children and adolescents. Researchers measured outcomes such as microbial eradication (clearing bacteria from the urine) and the frequency of UTI recurrence. A key limitation is that evidence quality varies across studies, and many are older, meaning comparative evidence is lacking against many current antibiotics.


Areas of Uncertainty and Research Gaps

The primary area of uncertainty across nearly all indications is the impact of antibiotic resistance. Efficacy in a given region today may not align with historical study findings. Another significant limitation is the general lack of long-term data for most acute conditions. Follow-up durations were limited, meaning the evidence contributes to understanding short-term symptom patterns, but long-term outcomes are not well established.

Key Studies & References

  1. Low-dose trimethoprim-sulfamethoxazole for prophylaxis of Pneumocystis jirovecii pneumonia in HIV-uninfected patients: a systematic review and meta-analysis
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Frequently Asked Questions (FAQ)

Common questions about Septrin Pediatrico (FAQ)


Q: What is the difference between Septrin Pediatrico and the adult version?

The pediatric version is formulated as an oral suspension or syrup. This liquid form is specialized to facilitate accurate and convenient administration for infants and children, as per regulatory design. The adult version is typically available as a solid tablet.


Q: Can Septrin Pediatrico cause sun sensitivity?

Official product information indicates that this medicine may cause increased sensitivity of the skin to sunlight, a condition known as photosensitivity. Official guidance indicates patients may need to protect themselves from prolonged sun exposure while using the medication, as a preventative measure.


Q: Do children usually need to drink extra fluids when taking Septrin Pediatrico?

Official administration instructions emphasize maintaining adequate fluid intake throughout the treatment course. This practice is necessary to help the kidneys properly eliminate the medicine and to help prevent a condition called crystalluria, where crystals form in the urine.


Q: Are there any reported long-term effects of using Septrin Pediatrico in childhood?

The research evidence overview notes that there is generally a lack of long-term data for most acute conditions that this medicine treats. The medicine is primarily used for short-term acute treatment, though it is used for long-term prophylaxis (prevention) of certain infections in specific patient groups, such as those with compromised immune systems.


Q: What are the most serious side effects associated with Septrin Pediatrico that I should know about?

Regulatory safety notes highlight the risk of rare but serious adverse reactions, which include severe skin reactions like Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN). The profile also lists serious blood disorders, such as agranulocytosis and aplastic anemia.


Q: Is the medication still effective if a dose is missed?

If a dose is missed, regulatory guidance generally suggests taking it as soon as it is remembered unless it is nearly time for the next scheduled dose. Patients are advised not to take a double dose to compensate. The official guidance emphasizes that the full prescribed course should still be completed.


Q: Is it normal for a child's urine to change color when taking Septrin Pediatrico?

The official safety profile lists dark urine as an adverse effect with an unknown incidence. Observation of this effect is a reason to seek guidance from a healthcare provider.


Q: Why is Septrin Pediatrico sometimes prescribed for long periods?

The medicine is sometimes prescribed for long periods for the prevention (prophylaxis) of specific serious infections. The most notable example is Pneumocystis jirovecii Pneumonia (PJP), which can occur in patients who have a compromised immune system.


Q: Can Septrin Pediatrico cause diarrhea in children?

Yes, diarrhea is listed as a common side effect in the official safety profile for the medicine. This is a potential effect of many antibacterial agents.


Q: Is a mild rash common when a child starts taking Septrin Pediatrico?

Yes, a skin rash is listed as a common adverse reaction in the official safety profile for the medicine. Official guidance advises that a rash, even if common, should be monitored and mentioned to a healthcare provider.


Q: How does Septrin Pediatrico affect the body's natural gut bacteria?

As a broad-spectrum antibacterial agent, the medicine is known to impact microbial populations throughout the body, including the gut flora. The official adverse reaction profile notes the risk of severe diarrhea related to Clostridium difficile and fungal overgrowth (like thrush), which are associated with this change.


Q: Can Septrin Pediatrico cause problems with blood cell counts?

Yes, official safety information lists potential problems with blood cell counts, classified as Blood and Lymphatic System Disorders. These can include rare but serious conditions like leukopenia (low white blood cells) and thrombocytopenia (low platelets).


Q: Why is Septrin Pediatrico sometimes used to prevent infections?

It is officially indicated for the prophylaxis (prevention) of specific infections, such as Pneumocystis jirovecii Pneumonia (PJP). This preventative use is common in patients who have a higher risk of developing such infections due to a weakened immune system.


Q: Is Septrin Pediatrico appropriate for treating ear infections?

Official indications in some regulatory labels include the treatment of acute otitis media (middle ear infection) in pediatric patients. The medicine is used in these cases when the infection is proven or strongly suspected to be caused by susceptible bacteria.


Q: Is there a risk of crystalluria mentioned in the research for Septrin Pediatrico?

Yes, the use of the sulfonamide components is associated with a risk of crystalluria, which means the formation of crystals in the urine. This is why maintaining adequate fluid intake is strongly emphasized in the official administration instructions to help reduce this risk.


Q: Can children who are dehydrated use Septrin Pediatrico?

Official warnings state that patients who are dehydrated may be at an increased risk for crystalluria and lithiasis (stone formation). The importance of adequate fluid intake is stressed to manage this risk and requires careful consideration by a healthcare provider.


Q: What happens if a child vomits shortly after taking Septrin Pediatrico?

Official patient information advises that if a child vomits shortly after taking a dose, a healthcare provider should be contacted immediately. Official information states that a repeat dose should not be given unless specifically advised by a healthcare professional.


Q: Are there specific safety warnings for children with certain genetic conditions?

Yes, official safety notes list a warning regarding the potential use of the drug in patients with Glucose-6-Phosphate Dehydrogenase (G6PD) deficiency. This is due to the risk of hemolytic anemia (destruction of red blood cells).


Q: Is Septrin Pediatrico linked to temporary changes in mood or behavior?

The official safety profile lists a variety of central nervous system (CNS) effects with unknown or uncommon frequency, including confusion, apathy, and nervousness. Patients are advised to report any unusual changes in mood or behavior to their healthcare provider.


Q: Can taking Septrin Pediatrico lead to a secondary fungal infection like thrush?

Yes, the official safety profile for the medicine lists fungal or monilial overgrowth (such as thrush or candidiasis) as a common adverse effect. This is because the medicine may affect the balance of the body's natural flora.


Q: Does the medicine contain any common allergens like gluten or lactose?

The oral suspension formulation contains specific excipients (inactive ingredients), which in some formulations may include sucrose (sugar) and ethanol (alcohol) for stability and palatability. Official warnings for common allergens generally do not list gluten or lactose in the standard formulation excipients; reference to the specific product label is the primary source for excipient information.


Q: Can a child with G6PD deficiency use Septrin Pediatrico?

The medicine requires special care in patients with G6PD deficiency due to the established risk of hemolysis (red blood cell destruction). The decision to use the medicine in this population is based on a doctor's careful assessment of risk versus benefit and requires close patient monitoring.


Q: Can Septrin Pediatrico affect blood sugar levels?

Yes, the official safety profile lists the potential for changes in blood sugar, specifically hypoglycemia (low blood sugar), as an infrequent adverse effect. This is particularly noted in patients who have impaired kidney function or other specific conditions.


Q: Why do some labels mention that Septrin Pediatrico is for 'serious infections'?

Regulatory labels may refer to it as being for certain serious infections because its use is often reserved for those infections where it is known to be effective and where bacterial resistance to other agents is a concern. Official guidance emphasizes considering its appropriate use among antibacterial agents.

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How should Septrin Pediatrico be stored and disposed of?

Official Storage and Disposal Requirements

Storage of Septrin Pediatrico (Co-trimoxazole oral suspension) must strictly adhere to regulatory conditions to preserve its integrity. The medicine must be stored at a temperature below 25°C and must be protected from light. It is prohibited to freeze the product.

Stability and Handling

Condition Requirement
Temperature Store below 25°C
Freezing Do not freeze
In-Use Stability Discard unused contents four weeks after opening

Ensure the medicine is kept in its original container and is stored out of the sight and reach of children.

Disposal Instructions

Unused or expired suspension should not be poured down the sink or flushed. Disposal should utilize an official drug take-back program or, if unavailable, follow procedures to mix the medicine with an undesirable substance before discarding it in the household trash.

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

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