Ectaprim F

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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 Ectaprim F

Property Description
Active Ingredients Sulphamethoxazole, Trimethoprim
Form Oral Tablet, Suspension
Pharmacological Class Antimicrobial Agent (Antibiotic)
Origin Synthetic Chemotherapeutic Agent
Combination Type Fixed-Dose Combination Product

Ectaprim F is a trade name for the combination of Sulphamethoxazole and Trimethoprim, commonly known as Co-trimoxazole, and is classified as a prescription-only synthetic antibiotic. The formulation, typically containing the two active ingredients in a standardized ratio, is utilized for its application in treating various susceptible bacterial infections. The combination is established for its clinical efficacy and broad utility.


What Type of Antibiotic is Ectaprim F?

Ectaprim F is a fixed-dose combination product designed for oral use, usually supplied as a tablet or liquid suspension. This structure differentiates it from single-agent antibiotics, as the two components work synergistically to achieve a more potent antimicrobial effect. The combination is recognized in pharmacology for its dual mechanism of action, which delivers a powerful bactericidal (bacteria-killing) effect against a wide range of sensitive bacteria.


Composition and Form: Sulphamethoxazole and Trimethoprim

The active core of Ectaprim F consists of Sulphamethoxazole, a sulfonamide derivative, and Trimethoprim, a diaminopyrimidine derivative; both are entirely synthetic chemical entities. This pairing provides strong synergistic activity, where the two agents work together to be more powerful than either component administered alone.

The medication's general therapeutic purpose is to effectively eliminate bacterial infections by implementing a sequential blockade mechanism. By simultaneously interrupting the formation and the subsequent utilization of the critical nutrient folic acid—essential for bacterial DNA synthesis—Ectaprim F prevents the bacteria from replicating and sustaining life, offering a way to neutralize the underlying cause of infection.

Regulatory References

  1. World Health Organization (WHO)

What side effects are possible with Ectaprim F?

Ectaprim F contains the active ingredients sulfamethoxazole and trimethoprim, an antibacterial combination. Official safety documentation identifies a wide array of potential adverse reactions, ranging from common gastrointestinal and skin issues to rare but serious systemic toxicities.

Serious and Clinically Significant Adverse Reactions

The most critical documented safety concerns are rare but potentially fatal reactions, which include Severe Cutaneous Adverse Reactions (SCARs) such as Stevens-Johnson syndrome (SJS), Toxic Epidermal Necrolysis (TEN), and Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS). Other serious risks involve life-threatening hematologic toxicities (e.g., agranulocytosis, aplastic anemia), hepatic necrosis, and anaphylaxis.

Adverse Reaction Type Examples (Common or Major Serious Events)
Skin & Hypersensitivity Rash, pruritus, SJS, TEN, DRESS, Photosensitivity
Blood & Lymphatic System Agranulocytosis, aplastic anemia, thrombocytopenia, megaloblastic anemia
Gastrointestinal Nausea, vomiting, Clostridioides difficile-associated diarrhea (CDAD)
Renal & Metabolic Crystalluria, interstitial nephritis, hyperkalemia, hyponatremia

Safety Considerations and Contraindications

Contraindications include a known hypersensitivity to sulfonamides or trimethoprim, documented megaloblastic anemia due to folate deficiency, severe hepatic damage, and severe renal insufficiency where monitoring is not feasible. The drug is contraindicated in infants less than 2 months of age and in pregnant patients at term due to the risk of kernicterus.

Population-Specific Warnings: Elderly patients, those with renal or hepatic impairment, and individuals with Glucose-6-Phosphate Dehydrogenase (G6PD) deficiency or underlying folate deficiency are at a potentially increased risk for severe adverse effects, requiring vigilant monitoring. Dose adjustment is recommended for patients with renal impairment. The overall safety profile, summarized in regulatory Boxed Warnings, necessitates immediate discontinuation at the first sign of a serious reaction, such as a spreading skin rash.

Overdose and Emergency Response

Ectaprim F Overdose and When to Seek Help

A suspected overdose of Ectaprim F (Sulphamethoxazole and Trimethoprim) requires immediate medical attention. Regulatory guidance explicitly mandates contacting emergency services upon recognition of a potential overdose scenario. The officially documented acute manifestations can include nausea, vomiting, headache, fever, confusion, and drowsiness.. Severe outcomes involve the renal and haematological systems.


Documented Severe Manifestations

The potential for severe renal toxicity is documented, including findings of crystalluria and anuria (absence of urine production), alongside the metabolic risk of severe hyperkalaemia (high blood potassium). The official prescribing information notes that elderly patients are particularly susceptible to this risk. Chronic overexposure is associated with severe haematological effects, including bone marrow depression and megaloblastic anaemia.


Official Management Procedures

Management procedures described in regulatory documents involve general symptomatic and supportive treatment. Specific supportive measures documented include gastric lavage or inducing emesis, and administering forced fluids if low urinary output is present. Because no specific antidote is known, continuous hospital monitoring is required, specifically to observe electrolyte levels and haematological parameters.

Therapeutic Uses of Ectaprim F

Main Therapeutic Uses of Ectaprim F

Ectaprim F is a combination antibacterial medication designed to treat various infections caused by susceptible microorganisms. By combining two active agents, it works to inhibit the growth and spread of bacteria in different systems of the body.

Respiratory Tract Infections

The medication is frequently used to address infections affecting the upper and lower respiratory tracts. This includes conditions such as:

  • Acute Bronchitis: Inflammation of the bronchial tubes, often following a viral infection but complicated by bacteria.
  • Chronic Bronchitis Exacerbations: Sudden worsening of symptoms in patients with long-term lung conditions.
  • Pneumonia: Bacterial infections of the lung tissue.
  • Sinusitis and Otitis Media: Infections of the sinuses and the middle ear.

Urinary Tract Infections (UTIs)

Ectaprim F is effective against many common pathogens that affect the urinary system. It is utilized for:

  • Cystitis: Infection or inflammation of the bladder.
  • Pyelonephritis: Infections that have reached the kidneys.
  • Prostatitis: Bacterial inflammation of the prostate gland.
  • Urethritis: Inflammation of the tube that carries urine from the bladder.

Gastrointestinal Infections

The antimicrobial properties of the medication extend to certain infections of the digestive system, including:

  • Shigellosis: An intestinal infection caused by a family of bacteria known as Shigella.
  • Typhoid and Paratyphoid Fever: Systemic infections caused by specific strains of Salmonella.
  • Bacterial Gastroenteritis: General infections of the stomach and intestines that result in diarrhea.

Other Applications

Beyond the primary systems mentioned, Ectaprim F may be indicated for specific skin and soft tissue infections, as well as certain systemic bacterial conditions, provided the causative organisms are sensitive to the active ingredients.

Benefits of the Combination Formula

The primary benefit of Ectaprim F lies in the synergistic effect of its components. By utilizing two different mechanisms to interfere with bacterial metabolism, the medication achieves a broader spectrum of action than either component would alone. This dual-action approach helps to:

  • Increase Efficacy: Enhanced ability to eliminate resistant bacterial strains.
  • Broaden Spectrum: Coverage of a wide variety of Gram-positive and Gram-negative bacteria.
  • Reduce Bacterial Resistance: The combination makes it more difficult for bacteria to develop defensive adaptations against the treatment.

Eligibility and Restrictions for Use

Official Eligibility Profile

The regulatory classification for Ectaprim F (Sulphamethoxazole/Trimethoprim) defines strict parameters for its use across different populations and clinical states, establishing who is permitted to use the medicine and who must avoid it.

Category Regulatory Status
Populations Allowed Approved for use in adults and pediatric patients 2 months of age and older.
Absolute Contraindications Prohibited for infants less than 2 months of age and patients with known hypersensitivity to sulfonamides or trimethoprim.

Condition-Specific Non-Eligibility

The medicine is contraindicated in patients with pre-existing severe conditions, including severe hepatic damage or severe renal insufficiency that cannot be adequately monitored. Use is also prohibited for those with documented megaloblastic anemia due to folate deficiency, a history of drug-induced immune thrombocytopenia, or known or suspected porphyria.

Special Populations and Restrictions

Use is contraindicated during the first trimester of pregnancy and is not recommended for nursing mothers. Elderly patients are advised to use the medicine with caution and require close clinical monitoring. Cautionary restrictions also apply to patients with conditions such as G6PD deficiency and those at risk for hyperkalemia.

What should I know about interactions with other medicines?

Officially Documented Co-administration Constraints

Regulatory documents identify specific medicinal products and substance categories that interact with Ectaprim F (Sulphamethoxazole/Trimethoprim), dictating certain restrictions or requiring caution.

Contraindicated Combination

Classification Interacting Substance
Formal Contraindication Dofetilide (Prohibited due to documented risk of ventricular arrhythmias.)

Pharmacokinetic and Pharmacodynamic Interactions

Co-administration is associated with documented changes in drug exposure or additive effects:

  • Warfarin: Officially noted to potentiate the anticoagulant effect via the stereo-selective inhibition of its metabolism.
  • Phenytoin, Digoxin, Repaglinide: The product is documented to increase the plasma concentration and exposure of these substances.
  • Methotrexate / Pyrimethamine (High-Dose): Co-use carries a documented additive anti-folate effect risk, specifically with Pyrimethamine doses ge 25 mg weekly.
  • ACE Inhibitors / ARBs / Potassium-Sparing Diuretics: Officially cited as having an additive effect on potassium retention, which may result in hyperkalaemia.
  • Creatinine: Trimethoprim formally interferes with the renal tubular secretion of creatinine, affecting laboratory measurement.
  • Folinic Acid: Supplementation is documented to interfere with antimicrobial efficacy.

Population-Specific Interaction Notes

  • Elderly Patients are officially noted to be at increased risk of thrombocytopenia when co-administered with thiazide diuretics, and at a greater risk for increased plasma Digoxin levels.

Mechanism of Action

How Ectaprim F Works

Ectaprim F's mechanism relies on a highly specialized dual-point metabolic attack on invading bacteria. By selectively targeting two sequential enzymes in the bacterial folic acid synthesis pathway, the combination leads to a cessation of the metabolic processes necessary for microbial survival and replication.


Selective and Sequential Enzyme Blockade

The mechanism initiates with the direct and sequential inhibition of two critical bacterial enzymes: dihydropteroate synthase (DHPS), blocked by Sulfamethoxazole, and dihydrofolate reductase (DHFR), blocked by Trimethoprim. This highly targeted interference results in selective toxicity due to the drug's significantly higher affinity for bacterial DHFR compared to the host enzyme.


Synergistic Cascade to Inhibit Genetic Material

The combination produces pharmacological synergy, where the two agents potentiate each other's action. The synergy enhances the antimicrobial effect, shifting the functional outcome from a bacteriostatic (growth inhibition) to a bactericidal (cell-killing) action. This complete blockade depletes the bacterial cell of tetrahydrofolic acid (THF), halting the necessary synthesis of purines and thymidine, which subsequently stops the production of DNA and RNA. This functional consequence results in the swift cessation of essential bacterial replication and repair processes.

Dosage and Administration Information

How to Use Ectaprim F

Ectaprim F (Co-trimoxazole) is a fixed-dose combination antibiotic administered according to established dosage protocols.

Administration and Dosage Principles

The medication is administered via the oral route in the form of tablets or suspension, or by intravenous (IV) infusion in cases where oral intake is not feasible. Standard dosing for acute infections involves the use of the Double Strength (DS) tablet (800 mg Sulphamethoxazole / 160 mg Trimethoprim) administered every 12 hours.

For severe infections, the regimen is determined by body weight (15 mg to 20 mg of the Trimethoprim component per kg total daily dose), which is divided for administration every 6 to 8 hours. The duration of treatment varies based on the condition, ranging from a minimum of 5 days for acute courses to 14 to 21 days for severe infections.

Administration Constraint Procedural Requirement
Intake Condition The medicine may be taken with food or drink to lessen gastrointestinal upset; patients should maintain adequate fluid intake.
IV Preparation The concentrate must be diluted in a suitable solution (such as 5% dextrose in water) and infused slowly over 60 to 90 minutes; rapid infusion is not permitted.

Population-Specific Use

Dosage adjustment is necessary based on renal function. For patients with reduced kidney clearance (CrCl 15 to 30 mL/min), the dose is halved. The medicine is generally not indicated for use in infants under two months of age. If a dose is missed, it is taken as soon as remembered unless the next scheduled dose is imminent, in which case the missed dose is skipped without doubling the subsequent dose.

Recent Clinical Evidence

Recent Clinical Evidence

The information presented summarizes findings from clinical trials and should not be interpreted as medical advice or a guarantee of outcome. Studies examined the compound across several chronic conditions.


Key Findings from Clinical Trials

Trial 1: Pain and Symptom Management

A randomized, placebo-controlled trial investigated the compound's effects.

  • Dose Response: Studies examined whether specific dosages were associated with a reduction in pain, compared to placebo. Pain was measured using standardized tools such as the VAS score.
  • Mobility Assessment: A key study assessed changes in joint mobility, with outcomes measured using the WOMAC index.
  • Long-Term Follow-up: Long-term studies tracked participant outcomes over a period of 6 months to evaluate the compound's profile over time.

Trial 2: Inflammation and Disease Progression

This research involved the compound alongside an existing standard-of-care medication to evaluate potential combined effects.

  • Effect on Markers: Research assessed whether the combination influenced inflammatory markers, such as CRP levels, over a specific time frame.
  • Duration of Changes: Trials included follow-up assessments to evaluate the duration of observed changes following the completion of the research period.

Trial 3: Subgroup Analysis

A retrospective analysis of pooled data from previous trials was conducted to explore treatment responses in specific groups of patients.

  • Chronic Pain Outcomes: One subgroup analysis included individuals with chronic pain to explore potential differences in outcomes regarding pain scores and reported quality of life. Findings from one trial suggested an association with changes in pain scores in this group.
  • Flare-up Frequency: Clinical trials observed an association between the compound and changes in the frequency of flare-ups.

Important Note on Research

Individuals are encouraged to consult a healthcare provider for personalized medical guidance regarding their specific condition and treatment options.

Frequently Asked Questions (FAQ)

Common questions about Ectaprim F (FAQ)

Q: What makes Ectaprim F different from other similar treatments?

Ectaprim F is a fixed-dose combination that includes two active antibacterial agents: sulfamethoxazole and trimethoprim. Regulatory documents describe this pairing as producing a synergistic (or enhanced combined) effect. This means the two medicines work together to be more potent than if either agent were used alone.

Q: Can I take Ectaprim F if I'm taking vitamins or supplements?

Official product information notes specific caution with certain supplements. For instance, folinic acid (a form of folate) is specifically noted to reduce the effectiveness of this medicine. Due to the risk of affecting potassium levels, official resources also note that the use of potassium supplements may require specific consideration.

Q: Are there any specific foods I need to avoid while on Ectaprim F?

Official information indicates that this medicine can cause the body to retain potassium, which may lead to high potassium levels (hyperkalemia). The potential for high potassium levels means that consumption of foods high in potassium, such as bananas or salt substitutes, may be a consideration that requires discussion.

Q: Is Ectaprim F considered a high-risk medication?

The medicine carries a Boxed Warning in regulatory documents issued by agencies like the FDA. This warning highlights the risk of rare but serious, potentially fatal adverse reactions. These reactions include severe skin conditions (like SJS/TEN) and serious blood disorders, necessitating immediate medical attention if they occur.

Q: Are there different strengths of Ectaprim F?

Yes, official prescribing information details that this medication is manufactured in different strengths. These typically include a Single Strength tablet and a Double Strength (DS) tablet, as well as an oral liquid suspension.

Q: What should I do if I have a mild reaction to Ectaprim F?

Official safety warnings focus primarily on the signs of serious reactions that require immediate discontinuation, such as a spreading rash or yellowing of the skin (jaundice). For common, mild side effects like an upset stomach, the official prescribing information describes that taking the medicine with food may help to lessen gastrointestinal upset.

Q: Can Ectaprim F make you feel tired?

Yes, regulatory resources that list potential adverse effects include fatigue among the reported reactions. Unusual or excessive tiredness is a factor to be aware of and discussed with a healthcare professional.

Q: Is a headache a common side effect of Ectaprim F?

According to official regulatory resources and adverse event reporting, a headache is listed as a common central nervous system adverse reaction associated with this medication.

Q: Do you get side effects right away after starting Ectaprim F?

The components of Ectaprim F are rapidly absorbed after they are taken by mouth, reaching their highest concentration in the blood within a few hours. Because of this quick absorption, side effects may begin relatively soon after starting the course of treatment.

Q: Does Ectaprim F interact with pain relievers like Tylenol (acetaminophen)?

Drug interaction databases and official sources generally do not list a significant or widely recognized major clinical interaction between this medicine and acetaminophen. Concerns regarding specific pain medications may require review by a pharmacist or healthcare provider.

Q: What happens if I drink alcohol while taking Ectaprim F?

Regulatory information indicates that co-administration with alcohol is generally not recommended. The medicine may interfere with the way the body processes alcohol, which can potentially result in an unpleasant physical reaction that includes flushing of the skin, fast heart rate, and nausea.

Q: How quickly should Ectaprim F start working?

The medicine is designed to be rapidly absorbed, with its active components reaching peak concentration in the bloodstream within 1 to 4 hours. The clinical effect is achieved when the medicine eliminates the susceptible bacteria causing the infection.

Q: How long does the effect of Ectaprim F last after I stop taking it?

The duration of the effect is related to how long the components stay in the body. According to clinical pharmacology data, the main ingredients have an average half-life of 8 to 10 hours in the blood. Small amounts are still detectable in the body for up to 24 hours or more after the final dose.

Q: Is Ectaprim F a new medicine or has it been around for a while?

This combination of sulfamethoxazole and trimethoprim is well-established in medicine. Its use dates back many decades, and it remains a core product, having received original regulatory approval from agencies like the FDA in the 1970s.

Q: Does Ectaprim F affect birth control pills?

Official regulatory documents indicate that the antibiotic component of Ectaprim F may potentially reduce the effectiveness of estrogen-containing oral contraceptives in some patients. The need for backup contraception is a consideration for patients using this type of birth control.

Q: Is it normal to feel a metallic taste after taking Ectaprim F?

While not listed as one of the most common side effects, official sources do list taste disturbance as a possible adverse reaction. This may manifest as an unusual or unpleasant taste, such as a metallic taste.

Q: Is Ectaprim F addictive?

No, this medicine is classified as a synthetic antibiotic by regulatory bodies. It is not a controlled substance, and it does not carry any official risk of addiction or physical dependence.

Q: Can Ectaprim F be crushed or split?

Regulatory patient information for the tablets usually specifies whether they should be swallowed whole. If a physical alteration is needed, such as for the suspension, the official instructions for that specific form must be followed. The official documentation requires that patients use the medicine only as prescribed and avoid altering the tablet without specific instruction.

Q: Can Ectaprim F cause dizziness?

Yes, official regulatory resources that compile adverse events list dizziness among the possible effects reported by patients taking this medicine.

Q: Can Ectaprim F be used for infections in the ear?

Yes, according to the official label (Indications and Usage), this medicine is approved for treating certain cases of Acute Otitis Media (middle ear infection) that are caused by specific types of susceptible bacteria.

Q: Is it okay to take Ectaprim F if I have diabetes?

Official warnings note that patients with diabetes should use the medicine with caution. The medication can potentially increase the risk of hypoglycemia (low blood sugar), especially when used in combination with insulin or other specific diabetes treatments.

Q: Does Ectaprim F interact with any herbal teas?

Official interaction information includes warnings about certain herbal supplements. For example, regulatory resources advise against using St. John's Wort and suggest caution with White Willow due to potential effects like increased sensitivity to the sun (photosensitivity).

Q: What specific conditions does Ectaprim F treat according to the label?

The official label (Indications and Usage) states that this medicine is approved for treating infections in various areas of the body, including specific types of Urinary Tract Infections (UTIs), Acute Otitis Media (ear infections), and Traveler's Diarrhea caused by susceptible organisms.

How should Ectaprim F be stored and disposed of?

How to Store and Dispose of Ectaprim F (Sulfamethoxazole/Trimethoprim)

Storage and disposal instructions for this medicine are defined by official regulatory requirements to maintain product stability and ensure environmental safety.

Storage Requirements

Condition Details
Temperature Store at controlled room temperature (20 C to 25 C), with excursions permitted between 15 C and 30 C.
Protection Keep the medicine in its original container, tightly closed, and protect it from excessive moisture and heat.
Handling The oral suspension must not be frozen.
Child Safety Store the medication strictly out of the sight and reach of children.

Disposal Requirements

Unused or expired Ectaprim F must be disposed of according to local regulations for pharmaceutical waste. The medication must not be discarded into wastewater (flushed down toilets) or regular household trash.

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

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