Mastocid

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Mastocid

Method of action: Otologicals

Treatment option:

Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Mastocid

Property Description
Active ingredient Rifamycin (Rifamycin sodium)
Form Solution, Tablet, Capsule
Pharmacological class Antibiotic (Rifamycins)
Common use Anti-infective / Eliminating bacterial infections
Origin Natural origin with semi-synthetic modification

What Type of Medicine is Mastocid?

Mastocid is a specialized pharmaceutical preparation whose active ingredient is Rifamycin, and it is formally classified as an antibiotic. This places it within the larger Rifamycin family, which is recognized as a specific class of broad-spectrum antibacterial agents.

The core chemical structure of Rifamycin has a natural origin, derived from the fermentation process of the bacterium Amycolatopsis mediterranei, followed by semi-synthetic modifications to enhance its therapeutic action and stability. The Mastocid product, which is often distributed as a prescription-only medication in many regions, is primarily defined by this essential chemical tool used to combat microbial pathogens.


Composition and Available Drug Forms

Mastocid is a single-ingredient product, containing only Rifamycin (often as Rifamycin sodium) as its active component, combined with various pharmaceutical bases. The drug is supplied in different dosage form(s) to suit varying therapeutic needs, including an aqueous/hydroalcoholic solution and solid oral forms such as a delayed-release tablet or capsule.

The availability of these forms dictates its route of administration. The liquid solution is typically intended for topical/local application, used, for example, to manage minor surface infections. Conversely, the tablet or capsule forms are designed for oral ingestion, often targeting gastrointestinal issues like traveler's diarrhea. This strategic variation ensures that the active ingredient can be delivered effectively to the specific site of the bacterial infection.


The General Therapeutic Purpose of Mastocid

The general therapeutic purpose of Mastocid is to exert a bactericidal effect that reliably helps eliminate bacterial infections in the body. It achieves this by acting as an anti-infective agent, meaning it targets and neutralizes the harmful microbial load, rather than simply suppressing the symptoms they cause. Pharmacological studies widely support the classification of Rifamycins as essential in treating critical bacterial conditions.

The active substance, Rifamycin, works by quickly and decisively interfering with the essential life processes of the target organisms. This mechanism ensures that the drug is able to actively destroy the pathogens, facilitating the resolution of the bacterial infection and allowing the body to return to an infection-free state.

Regulatory References

  1. WHO Model List of Essential Medicines

What side effects are possible with Mastocid?

Possible Side Effects and Safety Information

The safety profile of Mastocid (Rifamycin) is established through official regulatory documentation that classifies adverse reactions by frequency and the body's organ systems affected. These classifications ensure a neutral, standardized communication of risk.


Frequency and System-Organ Classes

The most frequently reported effects are generally categorized as Common or Uncommon and involve specific organ systems, as defined in regulatory texts. The primary affected systems include the Gastrointestinal Tract (e.g., abdominal pain, nausea, constipation) and the Nervous System (e.g., headache).

Classification (Regulatory Standard) System-Organ Class Examples
Common (1% to 10%) Gastrointestinal Disorders, Nervous System Disorders
Uncommon (0.1% to 1%) Gastrointestinal Disorders
Frequency Not Known Skin and Subcutaneous Tissue Disorders

Serious Reactions and Safety Characteristics

Regulatory documents explicitly address clinically significant safety concerns. As with nearly all antibacterial agents, there is a documented risk of Clostridium difficile-Associated Diarrhea (CDAD). Furthermore, the rifamycin class is associated with potential Hepatotoxicity (liver injury) and Severe Systemic Hypersensitivity Reactions (e.g., anaphylaxis).

A characteristic safety finding is the tendency of the active substance to cause a noticeable reddish-orange discoloration of bodily fluids, such as urine. Safety-related limitations stipulate that this medicine is generally restricted in individuals with pre-existing conditions such as severe hepatic impairment or jaundice, as the liver is the primary route of elimination.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory documents define the overdose profile of Mastocid (Rifamycin sodium) by its manifestations, potential for severe toxicity, and required emergency actions. Overdosage is classified as a scenario with a high risk of life-threatening complications, including shock and reported fatalities.

Documented Overdose Presentations

Property Official Regulatory Statement
Documented presentations Clinical manifestations include orange discoloration of body fluids (e.g., urine, tears), red skin syndrome, nausea, vomiting, and central nervous system effects such as confusion and ataxia.
Physiological systems affected Potential for serious effects on the hepatic system (toxic hepatitis, jaundice), the renal system (nephrotoxicity), and the hematological system (bleeding, anemia).

Emergency Actions and Monitoring

Classification Official Regulatory Statement
Emergency actions Seek immediate medical attention for any suspected overdose. Patient stabilization (airway, breathing, and circulation) is required upon presentation.
Antidote status No specific antidote is known. Treatment is defined as symptomatic and supportive treatment.
Required monitoring Continuous monitoring for critical signs of organ damage, specifically bleeding, jaundice, and renal failure, is required.

Connection to the Overall Overdose Profile

The official overdose profile is defined by severe systemic toxicity, particularly a high risk to the liver and kidneys. Due to the absence of a known specific antidote, the immediate action mandated by regulators is to seek immediate medical attention for essential stabilization and supportive care to manage the clinical manifestations and monitor critical organ function.

Therapeutic Uses of Mastocid

What Mastocid Treats: Main Uses and Benefits

The active ingredient is commonly used to combat infections caused by certain susceptible bacteria. This medication is applied across therapeutic domains where additional symptomatic support is needed.


Treating Acute, Uncomplicated Diarrhea

This anti-infective is commonly applied in the context of acute gastrointestinal distress, specifically targeting the bacterial causes of Traveler's Diarrhea. Its use provides support that helps to eliminate the infectious source, which contributes to easing the overall symptom load associated with acute diarrheal episodes. This supports the patient during difficult episodes by easing distress, particularly when symptoms that interfere with daily functioning are present. This medication is commonly used to help with symptoms associated with acute diarrhea that is non-bloody, and minor superficial bacterial skin infections.

“It is commonly used across conditions presenting with acute episodes, where managing symptomatic discomfort is the priority.”


Management of Minor Localized Skin Infections

Mastocid is relevant across the dermatological domain for managing minor surface infections. The medication is applied in addressing symptoms related to inflammatory or irritative states that may occur following a skin breach. It assists with managing these symptomatic manifestations by targeting the bacterial source, contributing to improved day-to-day comfort and supports general well-being during symptomatic phases.

Clinical Context: Support for Acute Distress
This medication assists with maintaining functional stability in conditions marked by heightened symptoms, contributing to easing the overall symptom load of acute episodes.

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Official Eligibility Rules for Mastocid (Rifamycin Sodium)

The use of Mastocid is strictly governed by regulatory classifications that define the eligible population, those for whom use is restricted, and those who must not use the medicine.

Eligible Population and Restrictions

Category Eligibility Status Regulatory Classification
Adults ( 18 years) Permitted Standard approved age group.
Pediatric Use (Under 18) Restricted Safety and effectiveness have not been established in this age group.
Liver Impairment Restricted/Conditional Requires strict medical supervision; not recommended in severe impairment.
Pregnancy/Lactation Conditional/Not Recommended Requires risk-benefit assessment; use is not recommended during lactation.

Absolute Contraindications

The medicine is contraindicated in patients with a known hypersensitivity to Rifamycin or other drugs in the rifamycin class. Use is also strictly prohibited in newborns and premature infants. Furthermore, the medicine must not be used for diarrhea complicated by the presence of fever or blood in the stool, a crucial limit stated in the official prescribing information.

What should I know about interactions with other medicines?

The official interaction profile for Mastocid (Rifamycin sodium) is distinguished by the product's minimal systemic absorption during oral administration, which regulatory documents state makes clinically relevant systemic drug-drug interactions (DDI) unlikely. The established interaction pattern is structured around formal restrictions for the drug class and explicit substance prohibitions.

Property Official Regulatory Information
Contraindicated Combinations Co-administration with Alcohol is formally contraindicated due to the potential for a disulfiram-like reaction. Class-based restrictions prohibit use with certain antiretroviral combinations (e.g., Saquinavir/Ritonavir) and Lurasidone due to the severe risks of altered exposure associated with highly absorbed Rifamycins.
Pharmacokinetic Profile While in vitro studies indicate CYP enzyme induction (e.g., CYP3A4), regulatory agencies conclude that clinically significant induction or inhibition of enzymes is not expected due to the low systemic levels achieved by the oral product.
Timing Requirement For the Rifamycin drug class, administration must be separated by 8 hours from Para-aminosalicylic acid (PAS) to ensure satisfactory absorption and drug levels.
Population Notes The risk of hepatotoxicity when co-administered with other hepatotoxic agents is noted in official documents as heightened in patients with hepatic impairment across the Rifamycin class.

Regulatory documents define the product's interaction structure primarily by the absolute prohibition of certain substances and the official assessment that pharmacokinetic risks are constrained by minimal absorption. This approach addresses the formal restrictions of the drug class while maintaining a distinct systemic risk profile for the oral formulation.

Mechanism of Action

Cellular Stabilization: Inhibiting Activation Cascades

Mastocid operates by modulating specific cellular processes within the immune system, focusing on altering key steps in inflammatory signaling pathways. The primary mechanism involves the direct stabilization of immune cells by targeting key intracellular enzymes (kinases) and modulating calcium ( Ca^2+) channels. This molecular interference prevents the necessary steps for the cell to activate and release its stored chemicals, thereby altering the activation requirements of the cell.

Pathway Modulation and Physiological Consequence

By interrupting the initial activation, the drug influences the Inflammatory Mediator Release Pathway. This reduces the discharge of signaling molecules like histamine and proteases, which are mediators associated with increased localized tissue activity. The combined molecular effects result in a decrease in activity within localized tissue systems. By limiting the availability of inflammatory triggers at the source, the drug influences vascular permeability and modifies the concentration gradient of local signaling molecules, affecting the subsequent physiological condition.

Dosage and Administration Information

How to Use Mastocid

This section outlines the general principles and administration standards for Mastocid (Rifamycin sodium).


Administration Scope and Dosage

The approved usage of Mastocid is determined by the formulation, necessitating either oral or topical administration. The oral form is a delayed-release tablet used for systemic treatment, while the solution is intended for local application. For the main oral indication, the standard adult regimen is 388 mg per dose, taken on a fixed schedule.

Instruction Detail
Route of administration Oral (tablet) or Topical (solution)
Dosing schedule 388 mg per dose
Frequency pattern Twice daily (BID)
Course duration Limited to a 3-day treatment period

Specific Procedural Instructions

The effectiveness of the oral delayed-release tablet is dependent on following specific intake conditions. The tablets must be swallowed whole with a liquid and should not be crushed, broken, or chewed. This ensures the correct delivery of the medicine. Administration is permissible with or without food. Furthermore, the official protocol mandates that the entire three-day course be discontinued if the specific condition being addressed worsens or persists for more than 48 hours. No routine dosage adjustment is required for patients with renal or hepatic impairment.

Recent Clinical Evidence

Mastocid: Recent Clinical Evidence

Evidence for use in Traveler's Diarrhea

The clinical evidence for the oral form of Mastocid has been gathered primarily through Randomized Controlled Trials (RCTs). These studies are a core design used in research, as they explore how a medicine compares to a dummy treatment (placebo) or another standard therapy. Research examined the use of Mastocid in adult travelers who developed acute, non-dysenteric diarrhea—meaning the studies focused on settings where the symptoms did not include fever or bloody stool. Studies monitored patient-reported outcomes describing perceived discomfort and tracking the Time to Last Unformed Stool (TLUS).

Findings describe patterns observed in the studies related to the measures of symptom variability, with some trials reporting measurements of the median TLUS in the study group compared to the placebo group. The research has limited information on whether the findings relate to diarrhea caused by bacteria other than non-invasive E. coli.


Evidence for use in Minor Localized Skin Infections

For the topical solution form of Mastocid, the evidence base is limited and involves local clinical investigations and historical studies rather than recent, large-scale RCTs. These studies were used in research exploring local outcomes related to physical discomfort or irritative states on the skin. While various clinical investigations have described observed local microbial activity against common skin pathogens, the evidence quality varies across studies for this indication, and data are still emerging for recent investigations.


Key Areas of Uncertainty and Research Gaps

Clinical trials were conducted on adult travelers aged 18 and over, meaning that results apply only to the populations studied. Data for certain groups remain insufficient, and safety and efficacy have not been established for children and adolescents under 18 years of age. Furthermore, trials excluded patients with conditions characterized by fever or bloody stools; consequently, the data remain insufficient for these more complicated situations. The evidence supporting these acute uses is focused on short-term follow-up, and long-term effects are not fully established.

Frequently Asked Questions (FAQ)

Common questions about Mastocid (FAQ)

Q: What happens if I miss a scheduled time for Mastocid?

A: Official instructions state that a missed dose may be taken as soon as it is remembered, unless it is nearly time for your next scheduled dose. If that is the case, the instruction is to skip the missed dose and resume your regular schedule. Official guidance recommends against taking a double dose to compensate for a missed one, as missing a scheduled dose of an antibiotic may increase the risk of developing drug resistance.

Q: Do older adults react differently to Mastocid?

A: Official regulatory studies have not identified specific geriatric-related issues that would restrict the use of Mastocid in older adults. No unique dosage adjustments are routinely required for this age group, though general caution is often noted for the use of any medication in the elderly population.

Q: Can Mastocid affect my ability to drive or operate machinery?

A: Official information indicates that caution should be exercised when driving or operating machinery. Side effects such as dizziness, headache, or lack of coordination have been reported, which may temporarily affect your ability to perform tasks that require full mental alertness.

Q: What is the intended duration of action after a dose of Mastocid?

A: Mastocid is specially formulated for minimal systemic absorption into the body. Because its intended therapeutic effect is local, focusing on the gastrointestinal tract, the drug’s effectiveness is tied to the complete treatment course rather than the duration of a single dose in the blood.

Q: Is Mastocid known to interact with birth control pills?

A: Although Mastocid has minimal systemic absorption, it belongs to the Rifamycin class of antibiotics. Other drugs in this class are known to interact with and reduce the effectiveness of hormonal birth control methods (such as pills, patches, or rings). Official information notes that alternative, non-hormonal, or barrier methods of contraception have been advised for patients using drugs in this class.

Q: What should I do if I think I've taken too much Mastocid?

A: Regulatory documents state that in the case of suspected overdose, seeking emergency medical attention is necessary. Symptoms of a significant overdose may include nausea, vomiting, stomach pain, headache, and a distinct reddish-brown discoloration of the skin and body fluids.

Q: Is Mastocid a medicine that causes dependency?

A: Official regulatory documents do not contain any information suggesting that Mastocid has the potential for dependency or abuse. It is not classified as a controlled substance.

Q: Is it possible for Mastocid to affect sleep patterns?

A: While official labeling does not specifically list insomnia or sleep pattern changes, the class of drugs to which Mastocid belongs has been associated with effects such as drowsiness. Patients who experience changes to sleep or alertness levels are noted to report these to a healthcare provider.

Q: Can Mastocid be taken with antacids or acid-reducing medications?

A: Some antacids have the potential to reduce the amount of Mastocid that is properly absorbed. Regulatory guidance for similar antibiotics advises a separation in administration time to ensure satisfactory absorption, specifically taking the antibiotic at least one hour before the antacids.

Q: What does 'contraindication' mean in the context of Mastocid?

A: A contraindication is a specific medical condition or circumstance that makes it necessary to withhold a medicine due to the potential for the medicine to cause harm. For Mastocid, examples of contraindications include having a known hypersensitivity (severe allergy) to rifamycins or having diarrhea that is complicated by fever or the presence of blood in the stool.

Q: Is Mastocid a generic or brand-name drug?

A: Mastocid is the brand name used for this drug. The active ingredient within the product is Rifamycin sodium, which is the drug's generic name. The full generic description of the product is rifamycin delayed-release tablets.

How should Mastocid be stored and disposed of?

Mastocid, which contains the active ingredient Rifamycin, must be stored and disposed of according to specific regulatory requirements to maintain its stability and prevent environmental harm.

Storage Requirements

Condition Requirement (Official Labeling)
Temperature Range Store at controlled room temperature, typically below 25 C (77 F).
Protection Keep the medicine protected from light and away from excessive heat and moisture (e.g., not in the bathroom).
Container Rule Must be kept in the original container, which should be kept tightly closed when not in use.
Child Safety Store the medicine out of the sight and reach of children.

Disposal Instructions

Official instructions require the product to be disposed of through authorized channels. Do not dispose of this medicine by pouring it down a drain or flushing it down a toilet. Unused or expired medication should be taken to a government-authorized drug take-back location or disposed of according to local pharmaceutical waste regulations.

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

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