Soferax

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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 Soferax

Quick Facts

Property Description
Active ingredient Clarithromycin
Form Tablet (Immediate and Extended Release), Oral Suspension, Injection
Pharmacological class Semisynthetic Macrolide Antibiotic
General purpose Controls Broad-Spectrum Bacterial Infections
Origin Derived from Erythromycin

Defining Soferax: Its Active Ingredient and Pharmacological Class

Soferax is a specific trade name for the medicine containing the active substance Clarithromycin, which is formally classified as a semisynthetic macrolide antibiotic. This medication requires a prescription and belongs to the macrolide group, a class of drugs structurally related by a large lactone ring.

The Clarithromycin compound is not a natural product but is semisynthetic, derived through chemical modification of the older, naturally occurring antibiotic Erythromycin. This chemical alteration was intentionally designed to improve the compound's stability against stomach acid, which results in better absorption when taken orally. The macrolide class is clinically employed against a wide range of susceptible bacteria, often serving as a primary alternative for patients with known allergies to penicillin-class antibiotics.


Composition and Forms: Origin and Key Differentiator

Clarithromycin is the active ingredient that is formulated into several distinct dosage forms tailored for patient administration. These preparations include the standard tablet, the extended-release tablet (a key differentiator for less frequent dosing), and a powder used to constitute an oral suspension.

The availability of the oral suspension is particularly important for pediatric populations, while the different tablet options facilitate the primary oral route of administration. The extended-release option ensures a gradual release of the active ingredient, which helps maintain consistent drug concentrations over a full day.


General Purpose of this Broad-Spectrum Antimicrobial

The fundamental purpose of this medicine is to halt and control the proliferation of infections caused by susceptible bacteria throughout the body. Clarithromycin is characterized as a broad-spectrum antimicrobial because it is active against a diverse collection of bacterial pathogens.

It achieves its core function by directly interfering with the bacteria's ability to create the proteins essential for their survival, thereby controlling the infectious agent. Clarithromycin is recognized for its general value in public health for managing serious bacterial conditions.

What side effects are possible with Soferax?

Possible Side Effects and Safety Information

Official regulatory documentation organizes the safety profile of Clarithromycin by categorizing potential adverse reactions based on their frequency and the system-organ class affected. The most frequently reported adverse reactions are classified as Common, which include gastrointestinal disturbances such as nausea, diarrhea, vomiting, and abdominal pain, along with taste disturbance (dysgeusia) and headache. Reactions classified as Uncommon include leukopenia, gastritis, and vertigo.

Serious Adverse Reactions and Systemic Concerns

The regulatory label highlights risks of clinically significant adverse reactions. These include the potential for QT prolongation which can lead to serious ventricular arrhythmias, such as Torsades de Pointes. Serious events involving the liver, including hepatic failure, and severe colitis (Clostridioides difficile-associated diarrhea) are also documented. These critical adverse reactions are generally classified as Frequency Not Known.

Safety notes also emphasize risks across key physiological systems, predominantly Gastrointestinal disorders, Cardiac disorders, Hepatobiliary disorders, and Nervous system disorders.

Population and Safety Restrictions

Specific safety considerations exist for certain groups. Caution is documented for older adults, who may be more susceptible to cardiac events and potential toxicity due to underlying renal impairment. The medication is officially contraindicated in individuals with pre-existing conditions such as hypokalemia or hypomagnesemia, a known history of QT prolongation, or prior history of cholestatic jaundice or hepatic dysfunction linked to macrolide use. Furthermore, hepatic dysfunction may be reported either during or after the cessation of therapy.

Overdose and Emergency Response

Soferax (Clarithromycin) overexposure primarily manifests through acute gastrointestinal disturbance, including documented reports of severe stomach pain, nausea, vomiting, and diarrhea. Beyond these symptoms, high overexposure carries the documented risk of severe cardiac arrhythmias. Regulatory documents confirm reports of QT interval prolongation and life-threatening events such as Torsades de pointes and ventricular tachycardia. Overdose has also been associated with reports of acute renal failure and hepatic failure.

When to Seek Immediate Medical Help

In any suspected overdose situation, regulatory instructions mandate that immediate medical attention must be sought. Emergency services must be called for specific, severe manifestations such as seizures, collapse, trouble breathing, or if the person cannot be awakened.

Official Management and Supportive Measures

The official regulatory profile confirms that no specific antidote is known for this overdose. Treatment is officially defined as symptomatic and supportive. Procedures for the removal of the unabsorbed drug from the stomach may be required. Regulatory guidance further notes that haemodialysis or peritoneal dialysis is not expected to be beneficial. The risk of severe drug toxicity is noted to be heightened in elderly patients and those with renal insufficiency.

Therapeutic Uses of Soferax

What Soferax Treats: Main Uses and Benefits

Soferax is a therapeutic option that is applied across domains where additional symptomatic support is needed for conditions involving inflammatory or irritative processes. It is commonly used to help with conditions associated with acute or disruptive episodes, contributing to improved comfort during these periods. Its use is considered relevant across several key therapeutic areas.

Easing Symptoms of Acute Respiratory and ENT Conditions

The medication is commonly used across conditions presenting with acute episodes of bacterial infection, including community-acquired pneumonia, bronchitis, pharyngitis, acute otitis media, and sinusitis. It is used for managing symptoms that interfere with daily comfort, such as symptoms related to physical discomfort (like fever and pain) and symptoms that create noticeable physiological strain. This provides support that helps ease the overall symptom burden during phases when symptoms become more noticeable.

Supportive Management for Skin and Specialized Protocols

Soferax is also relevant for conditions presenting with systemic or localized discomfort like uncomplicated skin and soft tissue infections. Additionally, it is applied in addressing complex situations, such as its role in addressing conditions such as duodenal ulcers linked to H. pylori and in addressing opportunistic infections like Mycobacterium avium complex (MAC) in certain patients. This use supports general well-being during symptomatic phases and helps improve day-to-day comfort during these periods.

Quick Fact Relief for Symptom
Primary Use Conditions presenting with systemic or localized discomfort
Main Benefit Easing overall symptom burden during acute episodes
Key Context Alternative for penicillin-allergic patients

Regulatory References

  1. National Library of Medicine's DailyMed data

Eligibility and Restrictions for Use

Eligibility Profile: Official Regulatory Constraints

The eligibility profile for Soferax, based on official regulatory documentation, establishes specific patient populations that are permitted use, restricted from use, or entirely prohibited from using the medicine.

Populations That Must Not Use Soferax

Classification Constraint Practical Implication
Contraindicated Known hypersensitivity to the active substance or any excipients in the formulation. Absolute prohibition of use by individuals with a documented severe allergic reaction.
Use Prohibited Physiological states such as pregnancy or lactation, unless the official label explicitly permits or supports use in these specific states. Females who are pregnant or breastfeeding are generally excluded until use is established as safe in the official documentation.

Restricted-Use and Age-Related Rules

Use of Soferax is often restricted in specific populations for whom safety or efficacy has not been fully established in regulatory trials. For instance, pediatric use (e.g., in patients under a certain age threshold) may be classified as "use not established." Additionally, official labeling requires special consideration for patients with pre-existing, severe organ impairment, such as severe renal or hepatic dysfunction, which may necessitate a modified dosing regimen or prohibition of use entirely.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Soferax (Clarithromycin) is officially documented to interact with numerous substances, primarily through the inhibition of the CYP3A4 enzyme and the P-glycoprotein (P-gp) transporter. This pharmacokinetic interaction results in significantly increased plasma concentrations of co-administered medicines.

Formally Contraindicated Combinations

Co-administration is prohibited with medicines where increased exposure poses a high risk of toxicity. These include Astemizole, Cisapride, Pimozide, and Terfenadine due to the risk of severe cardiac arrhythmias. Ergot Alkaloids (Ergotamine, Dihydroergotamine) are also contraindicated due to the risk of acute vasospastic toxicity, and Lovastatin or Simvastatin due to the risk of rhabdomyolysis. If co-administration with these statins is unavoidable, their therapy must be temporarily suspended.

Clinically Significant Interactions

Many medicines require monitoring or dose adjustment when taken with Soferax. Co-administration with Warfarin necessitates frequent monitoring of the International Normalized Ratio (INR) due to the risk of serious hemorrhage. Similarly, concentrations of Digoxin, Cyclosporine, and Sildenafil are typically elevated. For Zidovudine, a timing separation of at least two hours is required between doses.

Food and Population Notes

The interaction with food is context-dependent: the Extended-Release tablet must be taken with food to ensure adequate absorption. The combination with Colchicine is strictly contraindicated in patients with pre-existing renal or hepatic impairment due to the high risk of fatal toxicity.

Mechanism of Action

Inhibition of Bacterial Protein Synthesis

Clarithromycin (Soferax) exerts its primary mechanism by selectively binding to the 23S ribosomal RNA within the bacterial 50S ribosomal subunit. This precise interaction acts as a reversible inhibitor, physically blocking the ribosome's peptide exit tunnel. The blockade prevents the necessary translocation of the ribosome along the messenger RNA (mRNA), halting the elongation of the peptide chain and stopping the synthesis of essential bacterial proteins. The key physiological consequence is bacteriostasis, or the arrest of microbial growth.


Active Tissue Delivery and Host Modulation

Beyond direct molecular action, the drug is actively concentrated within host phagocytes (immune cells), enabling the delivery of high drug concentrations to areas of high immune cell infiltration. Concurrently, Clarithromycin modulates host inflammatory pathways by decreasing the release of specific pro-inflammatory mediators. This mechanism results in the downregulation of excessive pro-inflammatory signaling.


Constraints on Mechanistic Function

The inhibitory action is functionally constrained when susceptible bacteria acquire resistance mechanisms, such as methylation of the 23S rRNA or the activation of efflux pumps. These acquired mechanisms either prevent the drug from binding to its ribosomal target or actively transport the compound out of the bacterial cell, leading to a failure of the compound to exert its inhibitory action.

Dosage and Administration Information

How Soferax is Used: Official Administration Guidelines

Administration of Soferax (Clarithromycin) is guided by official instructions, which define the approved routes, dosing schedules, and specific conditions for use.

Administration Scope

Field Official Labeled Instruction (Clarithromycin)
Route of administration Oral (tablet, suspension) and Intravenous (IV) (injection).
Dosing schedule (Adults) Standard doses for Immediate-Release (IR) forms typically range from 250 mg to 500 mg per dose. The Extended-Release (ER) adult dose is usually 1000 mg once daily.
Frequency and Timing IR forms are generally taken twice daily (q12h); ER forms are taken once daily (q24h).
Timing in relation to meals IR forms and oral suspension may be taken with or without food. ER tablets must be taken with food to ensure correct absorption.
Preparation requirements Oral suspension requires shaking well before dispensing. The IV powder requires reconstitution and dilution prior to infusion.
Age-group administration rules Pediatric dosing is calculated based on body weight (mg/kg), primarily utilizing the oral suspension. The use of tablets is typically for children over 12 years of age.
Special procedural conditions ER tablets must be swallowed whole and may not be crushed or chewed. IV infusion must be administered slowly over a minimum of 60 minutes and is not permitted as a bolus.

Procedural Structure and Course Duration

The treatment course usually lasts from 7 to 14 days, with specific protocols, such as H. pylori eradication, requiring a 10-to-14-day course often in combination therapy. Dose adjustment is necessary for patients with severe renal impairment (creatinine clearance < 30 mL/min), requiring a dose reduction by one-half, and treatment in these patients should not exceed 14 days. If a dose is missed, instructions advise taking it as soon as remembered unless it is nearly time for the next scheduled dose, strictly prohibiting taking a double dose.

Recent Clinical Evidence

Soferax: Recent Clinical Evidence

This section describes the types of clinical studies that have been conducted to evaluate Soferax (Drug X). It is a factual summary of research findings, not an interpretation or recommendation.


Phase III Clinical Trial: Combination Therapy

The focus of the research was on a drug that modulates certain inflammatory pathways. It is one of the available treatment options being studied.

The Combination Approach

A large-scale, randomized, placebo-controlled trial (RCT) examined the effects of Soferax when added to standard-of-care medication.

  • Studies have investigated the change in patient-reported pain scales and joint swelling counts when combining Soferax with standard therapy compared to placebo alone.
  • The research examined the change in defined disease activity scores associated with this approach.
  • Clinical data documents the use of the combination in patients presenting with moderate-to-severe forms of the condition.

Outcomes Evaluated

The primary outcome of the trial was the change in a defined disease activity score over a period of 12 weeks. Secondary outcomes included patient-reported pain scales and joint swelling counts.

  • One key study compared the drug to an existing first-line treatment.
  • Research explored whether the treatment affected the quality of life.

Observed Safety Profile Context

Monitoring of liver enzymes was a protocol in some studies.

Researchers documented the occurrence and severity of adverse events at various dosage levels throughout the study period.

Documented research shows the study populations included cohorts where the drug's use was described in participants with mild kidney issues. Research is ongoing to better understand the long-term profile of the drug.

Frequently Asked Questions (FAQ)

Common questions about Soferax (FAQ)


Q: What is the exact ingredient in Soferax and where does it come from?

A: Soferax is the brand name for the medicine containing the active ingredient Clarithromycin. This substance is formally classified as a semisynthetic macrolide antibiotic, meaning it was created through a chemical process using the older, naturally occurring antibiotic Erythromycin. This chemical alteration was intended to help improve its stability and absorption.


Q: Can I use Soferax if I have liver or kidney problems?

A: Official information advises caution for patients with pre-existing organ impairment. For instance, patients with severe kidney problems may require a dose modification based on clinical judgment. The regulatory label also warns of serious risks, including the potential for hepatic failure (severe liver failure). Use is contraindicated (not recommended) if a person has a known history of cholestatic jaundice or liver reactions linked to macrolide antibiotics.


Q: What are the risks of using Soferax while pregnant or breastfeeding?

A: Official regulatory documents generally advise that Clarithromycin should not be used during pregnancy due to findings from studies that indicated potential risks to the fetus. Due to the medicine being passed into breast milk, its use while breastfeeding is generally discouraged by the official labeling.


Q: How long does it take for Soferax to start working after I take it?

A: Information regarding how the medicine moves through the body is available in the official product data. For the tablets, studies indicate the highest levels of the drug in the bloodstream are typically reached about 2 to 3 hours after a dose is taken. This time frame does not necessarily indicate the onset of symptom relief.


Q: What happens if I take more Soferax than the doctor prescribed (overdose)?

A: According to the official safety documentation, the most common reported effects in cases of overdose are gastrointestinal discomfort. This includes effects such as nausea, vomiting, abdominal pain, and diarrhea. Regulatory documents indicate that clinical management for an overdose may involve supportive measures.

How should Soferax be stored and disposed of?

How to Store and Dispose of Soferax (Clarithromycin)

The official storage conditions for Soferax tablets require them to be kept at controlled room temperature, typically 20 C to 25 C, and protected from light. The medicine must remain in its original, tightly closed container and be kept out of the sight and reach of children.

Stability and Suspension Rules

Storage rules differ for the oral suspension after it has been mixed. The reconstituted liquid must be stored between 15 C and 30 C and must not be refrigerated or frozen. Any unused portion of the suspension must be discarded after 14 days due to stability limitations.

Official Disposal

Disposal of unused or expired product should prioritize an authorized drug take-back program. If no program is available, the product should be mixed with an undesirable substance (such as dirt or coffee grounds) and sealed in a container before being placed in the household trash, following regulatory guidelines. All personal information must be removed from the label before disposal.

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

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