Mitafar

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Mitafar

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Medically reviewed

Rosario Oropesa

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 Mitafar

Property Description
Active Ingredient Nitazoxanide
Form Tablet and Oral Suspension
Pharmacological Class Antiprotozoal Agent, Thiazolide Derivative
Common Use Targeting intestinal parasitic infections
Origin Synthetic Compound

What is Mitafar, and What is its Core Composition?

Mitafar is a pharmaceutical preparation containing the synthetic compound Nitazoxanide, which is broadly classified as a broad-spectrum anti-infective. This core classification places the drug within the distinct Thiazolide derivative chemical family. Nitazoxanide is officially designated as an antiprotozoal agent, a classification reflecting its primary function. This classification is based on its specific utility against parasitic entities.

The preparation is a single-ingredient product, relying solely on Nitazoxanide (INN) for its therapeutic effect. The compound itself is designed as a prodrug; following its oral administration, it is rapidly converted into its principal active therapeutic metabolite, Tizoxanide. This strategic transformation into Tizoxanide is a key differentiating feature, as this active form ensures systemic effectiveness.

How is Mitafar Classified, and What is its General Purpose?

Mitafar is functionally classified as an agent used to combat certain protozoal and helminthic infections, representing its primary general purpose. Nitazoxanide is utilized for its efficacy and broad utility against a range of protozoal pathogens. This recognized utility means the medicine is a clinically recognized agent for helping the body address infections that cause digestive upset and discomfort.

The medicine’s goal is to interrupt the essential energy metabolism pathways within the target parasites. By interfering with energy-generating systems crucial for the organisms’ survival and reproduction, the medicine aids in clearing the infection, helping to resolve the general adverse health effects caused by the parasitic presence.

What Forms Does Mitafar Come In?

Mitafar is available as an oral dosage form, specifically provided as a tablet and a powder for suspension (liquid). Both forms are intended for oral administration (taken by mouth). The availability of both forms is a key feature, as the liquid oral suspension is specifically optimized with excipients for the pediatric population, while the tablet form is suitable for adults.

Regulatory References

  1. National Institutes of Health (NIH)

What side effects are possible with Mitafar?

Mitafar: Possible Side Effects and Safety Information

This section outlines the adverse reactions and safety constraints for Mitafar as documented in official government regulatory information.

Adverse Reaction Categories

The adverse reactions associated with Mitafar are classified by how often they occur (frequency) and which body system they affect (System-Organ-Class or SOC).

Classification Examples of Documented Reactions
Common (Reported in ge 2% of patients) Gastrointestinal disorders (abdominal pain, nausea); Nervous System disorders (headache); Genitourinary disorders (chromaturia/urine discoloration).
Frequency Not Known (Post-marketing reports) Skin and subcutaneous tissue disorders (rash, urticaria); Nervous System disorders (dizziness).

Serious Adverse Reactions and Restrictions

Regulatory documents highlight specific serious risks and contraindications:

  • Serious Adverse Reactions: The risk of Hypersensitivity Reactions, including anaphylaxis, is documented. The label instructs that the drug must be discontinued immediately if a patient experiences signs of a serious allergic reaction.

  • Contraindication: Mitafar is strictly contraindicated in any patient with a prior known hypersensitivity to the drug's active substance or any other component in the formulation.

Population-Specific Safety Notes

The label addresses specific safety constraints related to certain patient groups:

  • Pediatrics: Safety and effectiveness for the oral suspension are not established in children younger than 1 year of age.
  • Immunocompromised Patients: Specific data regarding efficacy and adverse event profiles for certain parasitic infections in immunocompromised patients (e.g., those with HIV) are limited or have not demonstrated superiority over placebo, necessitating careful assessment.
  • Pregnancy: Animal studies did not show evidence of teratogenicity or fetotoxicity at high exposures, but clinical data on use in human pregnancy are limited.

Regulatory Safety Summary: The official safety profile is defined by a clear structure of common, expected reactions across several body systems and mandatory restrictions, especially the absolute contraindication for known hypersensitivity. This structure establishes the formal risk context for the medicine.

Overdose and Emergency Response

Overdose and When to Seek Help

The official prescribing information for Mitafar (Nitazoxanide) indicates that information regarding specific clinical manifestations of overdose is limited. Regulatory documentation notes that single oral doses of up to 4000 mg of the tablet formulation were administered to healthy adult volunteers without significant adverse effects.

Immediate Actions and Management

In the event that an overdose is suspected, contact with a poison control helpline is officially required. Urgent medical help must be sought immediately if severe, life-threatening systemic signs are observed, including collapse, a seizure, trouble breathing, or inability to be awakened. These conditions mandate an immediate call to emergency services.

No specific antidote is known for overdose with this compound. Management in a medical setting consists of patient observation and the provision of symptomatic and supportive treatment. For very recent ingestion, gastric lavage may be considered appropriate.

A critical consideration detailed in the regulatory data relates to drug clearance. The active metabolite, Tizoxanide, is highly protein bound (specifically >99.9%). This physiological constraint means that active clearance methods such as dialysis are unlikely to significantly reduce plasma concentrations of the drug in an overdose scenario. The official overdose profile is defined by these constraints, emphasizing supportive care and immediate emergency response for severe symptoms.

Therapeutic Uses of Mitafar

Quick Facts: Mitafar

Primary Uses
Managing diarrhea caused by Giardia lamblia
Managing diarrhea caused by Cryptosporidium parvum

Mitafar (Nitazoxanide) is a prescription medication utilized to address gastrointestinal distress. Its established therapeutic role is the management of diarrhea resulting from certain parasitic infections in individuals aged one year and older.

Specifically, the medication is used for the treatment of diarrhea caused by the protozoa Giardia lamblia and Cryptosporidium parvum. These conditions are often associated with the ingestion of contaminated water or food. The introduction of this therapy aims to reduce the duration and severity of the associated diarrhea.

This product has not shown significant clinical superiority over placebo for the treatment of C. parvum in patients who are HIV-infected or immunocompromised.

Eligibility and Restrictions for Use

Eligibility for Mitafar (Nitazoxanide)

Mitafar is approved for use based on specific age groups and contraindications detailed in official regulatory documentation. The medicine must not be used by any patient with a prior hypersensitivity to nitazoxanide or any other ingredient in the tablet or suspension formulations.

Population Group Eligibility Status (Regulatory Basis)
Infants (< 1 year) Use not established; safety and efficacy have not been studied [FDA].
Children (1–11 years) Approved for Oral Suspension only; tablets are not administered due to high single-tablet dose [FDA].
Adolescents & Adults (≥ 12 years) Approved for use with both the Tablet and Oral Suspension formulations [FDA].

Eligibility is limited for certain patient groups. Individuals who are HIV-infected or immunodeficient should note that Mitafar has not been shown to be effective (superior to placebo) for treating Cryptosporidium parvum diarrhea in this specific population [FDA].

Special Considerations

Use requires caution in patients with renal or hepatic impairment, as the pharmacokinetics of the drug in these patients have not been studied [DailyMed]. For pregnant or nursing women, official documents state there are no adequate data available; caution should be used when administered to a nursing woman, as it is unknown if the drug is excreted in human milk [FDA].

What should I know about interactions with other medicines?

Mitafar (which contains the active ingredient nitazoxanide) can interact with certain other medications, potentially altering its effects or the effects of the co-administered drug. These interactions may result from competition for plasma protein binding, which can affect the concentration of one or both drugs in the blood.

It is crucial to inform your healthcare provider about all prescription, over-the-counter medications, vitamins, and herbal supplements you are taking. Close monitoring may be necessary when Mitafar is combined with certain drug classes, particularly those that are also highly bound to plasma proteins, or immunosuppressive agents.

Key Potential Interactions

Drug Type Example Medications Potential Effect Recommendation
Anticoagulants Warfarin Increased risk of bleeding/altered effects. Close monitoring of coagulation (e.g., INR) is advised.
Highly Protein-Bound Phenytoin, Valproic acid Increased plasma levels of the co-administered drug. Monitor for signs of toxicity; dose adjustments may be needed.

In addition to drug-to-drug interactions, taking Mitafar with food is essential, as food significantly enhances the bioavailability of the medication, ensuring the appropriate drug levels are reached for optimal effect. Always follow your doctor's instructions for the correct timing of doses relative to meals.

Mechanism of Action

Mitafar, via its active metabolite Tizoxanide, acts by engaging specific molecular targets essential to the viability of susceptible organisms. The mechanism is defined by the selective disruption of energy generation in the target cells. This action exploits a structural difference in metabolic pathways between the organism and the host.

Selective Inhibition of PFOR Enzyme

The central mechanism involves the active ingredient non-competitively inhibiting the Pyruvate:ferredoxin oxidoreductase (PFOR) enzyme. This enzyme is essential for the anaerobic energy metabolism of target protozoa and certain anaerobic bacteria, functioning as a crucial mediator in the electron transfer chain required for energy production. The inhibitory mechanism is observed only against organisms that rely on this distinct metabolic machinery.

Disruption of Pathogen Energy Cascades

By blocking PFOR, Tizoxanide functionally arrests the oxidative decarboxylation of pyruvate, a required step for synthesizing essential energy compounds. This interruption initiates a biochemical cascade that results in the depletion of cellular ATP (energy) within the pathogen. The inability to produce energy prevents the organism from growing or replicating, leading directly to the loss of viability of the susceptible organism.

Mechanistic Specificity and Constraint

The mechanism is defined by its specificity for the PFOR pathway, a target absent in the human host's general cellular respiration. However, the mechanism is constrained to PFOR-dependent metabolism; organisms utilizing alternative energy pathways (e.g., aerobic bacteria) demonstrate reduced response to this inhibitory action.

Dosage and Administration Information

How Mitafar is Used: Administration Guidelines

Mitafar (Nitazoxanide) is administered exclusively via the oral route as a fixed-duration course of therapy.


Dosing Schedule and Timing

Administration is structured as a 3-day course, with the dose taken every 12 hours (twice daily). A condition for administration is that the medicine is taken with food, which is necessary for proper absorption and conversion to the active therapeutic metabolite, Tizoxanide.

Age Group Dosage Form Dose per Administration Total Course Duration
Adults (12 years and older) 500 mg Oral Tablet 500 mg 3 Days
Pediatric (4–11 years) Oral Suspension (100 mg/5 mL) 200 mg (10 mL) 3 Days
Pediatric (1–3 years) Oral Suspension (100 mg/5 mL) 100 mg (5 mL) 3 Days

Form-Specific and Procedural Requirements

The choice of dosage form is determined by the patient’s age, reflecting the need for precise dosing in pediatric patients. The 500 mg tablet is not used for children 11 years of age and younger; these individuals utilize the oral suspension. The suspension is supplied as a powder that is reconstituted with water prior to use and is shaken well before each administration to ensure the correct concentration is given.

If a dose is missed, the general practice is to take it when recalled, unless it is close to the next scheduled administration, in which case the missed dose is skipped; doubling doses is avoided.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Mitafar (Nitazoxanide)


Evidence for Use in Diarrhea Caused by Giardia lamblia

The research for the diarrhea caused by the parasite Giardia lamblia includes randomized controlled trials (RCTs). These are primarily short-term studies, which research examined by comparing the drug against an inactive substance (placebo) or an active comparator drug. These studies were generally applied in populations involving immunocompetent children and adults who presented with symptoms related to the infection.

Studies monitored the resolution of diarrhea and associated symptoms, and also focused on parasitological response, which involves checking post-treatment stool samples for the clearance or absence of the Giardia parasite. Studies monitored documentation of symptom resolution, reporting observations that differed between the drug group and the placebo group. Research also explored whether the clearance of the parasite itself was observed. Research so far indicates that the evidence is generally short-term, focusing on the period immediately after treatment ended.


Evidence for Use in Diarrhea Caused by Cryptosporidium parvum

The research for the diarrhea caused by the parasite Cryptosporidium parvum includes randomized controlled trials (RCTs) in individuals with typical immune function. These studies primarily involved immunocompetent children. Researchers examined acute changes in symptoms, such as the resolution of diarrhea, and monitored the clearance of C. parvum oocysts (parasite eggs) from stool samples. Studies monitored documentation of symptom resolution and clearance of oocysts, reporting observations that differed between the drug group and the placebo group.

However, the results apply only to the populations studied. The trials provided limited insight into outcomes related to this treatment for C. parvum infections in patients who are immunocompromised (such as those who are HIV-seropositive). Data for this specific subgroup remain limited.


Research in Specific Patient Groups

The main clinical evaluations included a significant focus on the pediatric population. Mitafar was evaluated in trials involving children as young as one year old for both Giardia lamblia and Cryptosporidium parvum infections. Conversely, data for certain groups remain limited, particularly for immunocompromised patients. The available studies did not adequately assess outcomes in these specific individuals.

Frequently Asked Questions (FAQ)

Common questions about Mitafar (FAQ)


Q: How quickly can someone expect Mitafar to start working?

Mitafar is approved for a fixed, short-term 3-day course of treatment. Official information indicates that the drug is rapidly converted into the active metabolite, Tizoxanide, following oral administration. This active form is designed to engage essential metabolic targets in susceptible organisms.


Q: Are there long-term side effects associated with Mitafar?

Official regulatory information confirms that Mitafar is approved only for a fixed, short-term 3-day course of treatment. The documented adverse reactions are those primarily observed during or shortly after this limited period of use. The available safety information is based on short-term use, consistent with the drug's fixed duration of treatment.


Q: Is Mitafar safe for people with kidney problems?

Official documents note that the pharmacokinetics (meaning how the drug is processed by the body) have not been studied in individuals with compromised kidney or liver function. Mitafar is used with caution in individuals with pre-existing kidney or liver conditions.


Q: What is the difference between Mitafar and [Competitor Drug Name]?

Mitafar is classified as an antiprotozoal agent that belongs to the unique thiazolide derivative chemical class. Its active ingredient, once in the body, is converted to Tizoxanide. This metabolite works by selectively inhibiting the PFOR enzyme, which is essential for the energy generation of certain susceptible organisms.


Q: What kind of studies support the use of Mitafar?

The use of Mitafar is supported by evidence from randomized controlled trials (RCTs). These studies examined the drug's effect on both the clearance of the parasite and the resolution of the associated symptoms in the approved patient populations.


Q: What evidence exists about Mitafar’s effectiveness in real-world use?

The primary evidence supporting the effectiveness of Mitafar comes from controlled clinical trials. Safety information is also gathered through ongoing voluntary post-marketing reporting, as is standard practice for all approved medicines.


Q: Does Mitafar have the same ingredients as other treatments for the same condition?

The active ingredient in Mitafar is Nitazoxanide, a unique synthetic compound. While other medicines treat similar conditions, Nitazoxanide is the specific chemical that defines its class as a thiazolide derivative.


Q: Is Mitafar considered an old or new medicine?

Official records show that the active ingredient in Mitafar (Nitazoxanide) was first approved for use by the FDA in 2002 (oral suspension) and 2004 (tablet formulation).


Q: Are there generic versions of Mitafar available?

Yes, official regulatory records indicate that generic versions containing the same active ingredient, Nitazoxanide, are currently available.


Q: Can Mitafar cause weight changes?

Weight change is not listed among the documented common or post-marketing adverse reactions in the official regulatory documents for Mitafar. The known side effects are primarily short-term and related to the digestive or nervous systems.


Q: What happens if I stop taking Mitafar suddenly?

Mitafar is intended to be taken for a fixed 3-day course of treatment. The purpose of the fixed-duration treatment is to clear the target infection completely. Discontinuing treatment early may risk incomplete clearance.


Q: Does Mitafar cause problems with sleep?

Yes, official regulatory documentation mentions that sleep disturbances have been reported. These reports include instances of both insomnia (difficulty falling or staying asleep) and drowsiness.


Q: Are there any foods or drinks that should be avoided while on Mitafar?

There are no specific foods or drinks listed in the official documentation that must be avoided. Official documentation specifies that Mitafar is taken with food to ensure proper absorption of the active ingredient.


Q: Is it safe to drink alcohol while taking Mitafar?

Official product information does not list a known interaction between Mitafar and alcohol (ethanol).


Q: Do you need to take Mitafar at a specific time of day?

The required schedule is to take the dose every 12 hours (twice daily) with food for 3 days. A specific time of day (such as a fixed clock time) is not mandated, only that the 12-hour interval is followed between doses.


Q: How long does Mitafar stay in your system after stopping?

The active metabolite, Tizoxanide, is quickly processed and excreted from the body via the urine, bile, and feces. The drug is not found to accumulate significantly in the body, especially given the short duration of the treatment course.


Q: Are there known interactions between Mitafar and grapefruit juice?

Grapefruit juice is not listed as having a specific or clinically significant interaction in the official regulatory documentation for Mitafar.


Q: Is Mitafar addictive?

Official regulatory bodies classify Mitafar as a non-controlled drug. It is not associated with potential for abuse or dependence.

How should Mitafar be stored and disposed of?

How to Store and Dispose of Mitafar

All forms of Mitafar (Nitazoxanide) must be stored strictly according to official regulatory requirements to maintain their stability and effectiveness.

Storage and Stability

Item Requirement
Temperature Store at Controlled Room Temperature, 25 C (77 F), with permitted excursions to 15 C to 30 C.
Prohibitions Keep away from excess heat, moisture, and do not freeze the medicine.
Container Keep the medication in the original container, tightly closed.
Suspension Life The reconstituted oral suspension must be discarded after 7 days.

Safety and Disposal

The medicine must be kept out of the sight and reach of children.

Disposal of expired or unused medication is preferably accomplished through a drug take-back program. If a program is unavailable, the product must be mixed with an undesirable substance (e.g., dirt or coffee grounds) in a sealed container and placed in the household trash, as it is not recommended for flushing.

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

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