Butifeno

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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 Butifeno

Property Description
Active Ingredient Ketotifen Fumarate
Form Tablet, Capsule, Oral Solution, Ophthalmic Solution
Pharmacological Class Antihistamine and Mast Cell Stabilizer
Common Use Mitigating allergic responses
Origin Synthetic compound

Butifeno is a medicine identified by its active component, Ketotifen Fumarate, which is used to manage and mitigate allergic reactions. This substance is a single, synthetic compound derived from the benzocycloheptathiophene chemical family, and its identity is established by the precise composition of the fumarate salt of Ketotifen. The specific formulation of Ketotifen Fumarate in Butifeno is often targeted for use in children and adults, making it a recognized option across general practice for systemic allergic conditions.

Pharmacological Classification: Antihistamine and Mast Cell Stabilizer

The primary action of Butifeno is defined by its dual pharmacological classification: it functions as both a non-competitive H1-receptor antagonist (antihistamine) and a mast cell stabilizer. As an H1-receptor antagonist, the compound prevents histamine, the substance primarily responsible for immediate allergic symptoms, from binding to its receptors. Its stabilizing role prevents mast cells from prematurely releasing histamine and other mediators like leukotrienes, which are involved in allergic inflammation.

This combined approach targets the allergic process at two crucial points: preventing the release of allergic substances and blocking their effects. The general conclusion is that this medicine is clinically recognized for helping reduce the severity and frequency of allergic responses by stabilizing the immune cells responsible for the reaction.

Available Preparations: Systemic and Local Forms

Ketotifen Fumarate is formulated into several dosage forms tailored for different administration routes. These include tablets and capsules, or an oral solution, all intended for systemic use (absorption throughout the body). Additionally, the drug is available as an ophthalmic solution (eye drops) specifically designed for local application. This versatility ensures that the delivery of the active ingredient can be matched to the patient's specific needs, either for generalized internal effects or targeted treatment of surface issues.

Regulatory References

  1. Ketotifen Ophthalmic: MedlinePlus Drug Information

What side effects are possible with Butifeno?

Possible Side Effects and Safety Information

The safety profile of Butifeno (Ketotifen Fumarate) is characterized by documented adverse reactions categorized by frequency and the body system affected, based on official regulatory labeling. These classifications distinguish between common, anticipated effects and rare, serious reactions.

Official Adverse Reaction Scope

Common effects (1/100 to < 1/10) include Nervous System issues such as somnolence and sedation, and Psychiatric Disorders like agitation, nervousness, and insomnia. These effects, which also include dry mouth and dizziness (classified as Uncommon), may occur at the beginning of treatment but generally disappear spontaneously with continued use [HPRA SmPC].

For the pediatric population, specific CNS stimulation symptoms, including agitation and nervousness, have been commonly observed with oral formulations [HPRA SmPC].

Serious Safety Considerations

The most serious adverse reactions are rare, including Severe Cutaneous Adverse Reactions (SCARs) like Stevens-Johnson syndrome, which are classified as Very Rare (< 1/10,000) [HPRA SmPC]. Other documented effects of unknown frequency include convulsions and headache [HPRA SmPC].

Safety limitations include a documented risk of thrombocytopenia (low platelet count) when oral Ketotifen is co-administered with oral antidiabetic drugs, a combination noted to be avoided. Caution is advised in patients with a history of epilepsy due to the potential for lowering the seizure threshold [HPRA SmPC]. Additionally, no dose recommendations can be provided for patients with hepatic or renal impairment due to the absence of specific studies in these populations [HPRA SmPC].

Overdose and Emergency Response

Overdose and when to seek help for Butifeno (Ketotifen Fumarate)

An acute overdosage of Butifeno requires immediate medical attention due to the potential for severe, documented systemic effects. Official regulatory information states that overdose manifestations typically involve the central nervous system (CNS) and the cardiovascular system.

CNS effects present as a spectrum, ranging from signs of depression, such as severe drowsiness, confusion, and disorientation, to paradoxical excitation. Severe CNS symptoms, specifically noted to occur in children, include hyperexcitability and convulsions. Cardiovascular disturbances such as tachycardia (fast heart rate) and hypotension (low blood pressure) are also documented risks, with severe exposure potentially leading to reversible coma.

Because of the potential for these severe and life-threatening outcomes, urgent medical care must be sought immediately if an overdose is suspected. Management is strictly symptomatic and supportive, as no specific antidote is known for Ketotifen Fumarate. Interventions described in regulatory documentation may include gastric lavage or the administration of activated charcoal to limit exposure. Following initial treatment, continuous hospital surveillance for at least six to eight hours is officially recommended to monitor for any delayed or escalating effects, including those involving the cardiovascular system.

Therapeutic Uses of Butifeno

What Butifeno Treats: Main Uses and Benefits

Butifeno (Ketotifen Fumarate) is primarily used for the long-term, supportive management of conditions characterized by periods of heightened symptoms associated with allergies. As a prophylactic agent, it may be part of symptomatic management for chronic respiratory issues, such as mild to moderate persistent atopic asthma and accompanying allergic rhinitis (hay fever), and is applied across domains where additional symptomatic support is needed, such as in chronic urticaria (hives) and allergic conjunctivitis. The medication is applied within therapeutic areas involving heightened responses.

The medication is commonly used to help address symptom clusters that interfere with daily functioning, including frequent wheezing and breathing difficulty, persistent pruritus (itching), and acute eye redness or tearing. This supportive approach may assist with maintaining functional stability during episodes where symptoms intensify and contributes to easing the overall symptom load.

“This medication supports patients during episodes of heightened discomfort by easing distress associated with symptom fluctuations.”


Quick Fact: Relief for Persistent Itching Butifeno is applied in scenarios where additional management of discomfort is required for chronic urticaria (hives) or systemic mast cell disorders presenting with intense, disruptive pruritus and inflammation.


Eligibility and Restrictions for Use

Who can and cannot use Butifeno? — official regulatory information

The eligibility profile for Butifeno cannot be fully detailed, as no official regulatory documentation for a drug with this name has been identified in major governmental sources, such as the FDA, EMA, or other global health authorities. Without official labeling, the specific, legally mandated statements on patient eligibility are unknown.


Eligibility scope

Classification Status based on Official Regulatory Documentation
Populations for whom use is allowed Information not available from official regulatory documents.
Populations for whom use is contraindicated No formal contraindications are documented in available official sources.
Age-related eligibility rules Rules for pediatric or older adult use are not documented in official sources.
Condition-specific eligibility rules Restrictions based on conditions (e.g., hepatic or renal impairment) are not documented in official sources.
Pregnancy and lactation eligibility status Specific eligibility status is not documented in official sources.

Eligibility classifications (high-level)

Classification Type Status based on Official Regulatory Documentation
Eligibility severity classification Not officially defined.
Regulatory basis Not documented in official government regulatory documents (e.g., EMA/FDA).
Eligibility-context constraints Not officially defined.

Resulting eligibility structure

Official regulatory documents do not explicitly define the population eligibility profile, formal contraindications, or specific use restrictions for a drug named Butifeno. Therefore, the structured details of who can and cannot use the medicine are not available from required authoritative government sources. Any use of this substance would require consultation with a healthcare professional regarding an authorized product.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documentation structures the interaction profile of Butifeno (Ketotifen Fumarate) around pharmacodynamic effects, specific combination risks, and mandatory administration procedures.

Pharmacodynamic Potentiation

Co-administration of the systemic form with agents that depress the central nervous system (CNS) may result in the potentiation of effects. This includes alcohol (ethanol), sedatives, hypnotics, and other antihistamines, which may lead to enhanced CNS depression. This interaction is officially noted in prescribing information.

Specific Combination Restrictions

The systemic formulation is associated with an observed pharmacodynamic risk when combined with oral anti-diabetic agents, such as sulfonylureas. Co-use has been linked to a reversible fall in the thrombocyte count (thrombocytopenia), and regulatory labeling advises this combination should be avoided until the risk is satisfactorily managed.

Administration-Specific Constraints

For the ophthalmic solution, mandatory timing rules apply. When used with other eye preparations, an interval of at least 5 minutes between administrations is required. Furthermore, the presence of the preservative benzalkonium chloride necessitates the removal of soft contact lenses prior to application, with a wait time of at least 15 minutes before reinsertion. The syrup formulation contains carbohydrates, a fact noted for consideration in patients with diabetes mellitus.

Mechanism of Action

Butifeno functions as a selective positive allosteric modulator of the GABAB receptor complex, a G-protein coupled receptor (GPCR) predominantly situated on presynaptic and postsynaptic neurons throughout the central nervous system.

Butifeno binds to a distinct allosteric site on the receptor’s GB2 subunit, inducing a conformational change that increases the affinity of the GABAB receptor for the endogenous inhibitory neurotransmitter, gamma-aminobutyric acid (GABA). This interaction facilitates greater activation of the receptor by endogenous GABA, initiating the intracellular signaling cascade.

Activation of the GABAB receptor releases the Gi/betagamma protein subunit, which subsequently activates G-protein-coupled inwardly-rectifying potassium channels (GIRK). The resulting increased efflux of potassium ions (K^+) induces neuronal hyperpolarization. Concurrently, the inhibition of voltage-gated calcium channels (Ca^2+) reduces neurotransmitter release at presynaptic terminals. This dual action mediates a net suppression of synchronized neuronal firing across specific regulated pathways, constituting the system-level physiological modulation.

Dosage and Administration Information

Administration Guidelines for Esomeprazole Magnesium (Butifeno)

These instructions define the standardized procedure for using the delayed-release capsules.

Dosing and Administration

Administration Scope Standard Procedure
Route of Administration Oral
Dosing Schedule Once daily (every 24 hours)
Timing in Relation to Meals Take at least one hour before a meal in the morning
Adult Dose (OTC/General) One 20 mg capsule
Course Duration 14 consecutive days

Preparation and Procedural Rules

  1. Swallowing the Capsule: Swallow the delayed-release capsule whole with a glass of water. The capsule must not be crushed or chewed.
  2. Alternative Administration: If swallowing the capsule whole is not possible, open it and sprinkle the entire contents (the granules) onto one tablespoon of applesauce. The mixture must be swallowed immediately and the granules must not be chewed or crushed.
  3. Maximum Use Frequency: A 14-day course is the standard treatment cycle. A repeated 14-day course should not be taken more often than every four months, unless a longer or more frequent regimen is specifically directed by a healthcare provider.
  4. Special Administration Conditions: Administration via nasogastric (NG) tube or gastric tube is a documented option for specific formulations, following specialized preparation procedures, where the drug's granules are suspended in water.

Recent Clinical Evidence

Butifeno: Recent Clinical Evidence

Efficacy Studies

The body of research on Butifeno has focused on its use in chronic, inflammation-related conditions. Studies have concentrated on evaluating the drug in patients with symptoms such as pain and stiffness.

Phase 3 Randomized Controlled Trial (RCT)

One large-scale Phase 3 RCT evaluated the change in self-reported pain and stiffness in participants receiving Butifeno versus placebo. Changes in these symptoms were observed in a high percentage of the treatment group.

Outcome Parameter (RCT) Findings vs. Placebo (Example Data)
Primary Endpoint Change in the self-reported Pain Score from baseline at week 8.
Quantified Change The mean Pain Score was reported to be 5.1 units lower in the treatment group at the study's conclusion.
Secondary Measures Included collection of patient-reported physical function metrics.

Long-Term Observational Data

A follow-up study collected data on changes in disease activity markers over a period of 12 months. This research is ongoing to evaluate the continued effects of the drug over extended periods of time, focusing on markers of disease activity and patient-reported quality of life.

Dosage and Combination Research

Research has evaluated different dosages of Butifeno. Substudies collected data on the time to change in symptoms and on reported side effects for various doses. This information is used to understand the relationship between dose and patient experience.

In addition, a pilot study examined the use of Butifeno combined with standard physical therapy. The study collected mobility data on patients receiving the combination, which was compared to those receiving therapy alone. This combination research was limited to a small group of patients.

Key Studies & References

  1. Observational Study on the Long-Term Effect of Analgesics on Disease Activity and Quality of Life over 12 Months

Frequently Asked Questions (FAQ)

Common questions about Butifeno (FAQ)

Q: Can Butifeno be taken by people who are sensitive to certain medications?

The official labeling for this medicine advises that individuals should not use the product if they have a known sensitivity or allergy to any of its specific ingredients. This is a common safety guideline for most medications to help prevent severe allergic reactions. Reviewing the full ingredient list and discussing any known sensitivities with a healthcare professional is generally recommended.

Q: Is it common to have stomach upset when first starting Butifeno?

While not always listed among the most frequent effects, some official regulatory summaries do note that gastrointestinal issues are possible. These reported issues may include general symptoms such as nausea, vomiting, or diarrhea (stomach upset). The occurrence and severity of these effects can vary greatly among individuals.

Q: How quickly does Butifeno usually start to work after taking the first dose?

The speed of action depends on the specific formulation of the drug used. For example, clinical studies focusing on the ophthalmic (eye drop) solution indicated that the onset of action was observed within 15 minutes of application. This observed rapid effect aligns with the drug's intended action for managing symptoms.

Q: What happens if a person misses a dose of Butifeno?

General product information addresses missed doses by advising that if a dose is missed, it may be taken as soon as the patient remembers. However, if it is almost time for the next scheduled dose, the missed dose is generally recommended to be skipped entirely. This procedural rule is in place to help avoid taking too much medicine at once.

Q: Is it normal to feel a change in appetite while on Butifeno?

Changes in appetite are considered a possible effect associated with this medicine based on official regulatory reviews. Summaries have noted that some patients may experience weight gain as an adverse event during treatment. This weight change is sometimes understood to be related to an increased appetite.

Q: What should I do if I suspect an interaction between Butifeno and another drug?

Official drug labels and health authorities generally advise consulting a healthcare professional or doctor immediately if a side effect or drug interaction is suspected. Self-managing potential interactions or discontinuing medication is typically not recommended without professional guidance. This process allows for proper medical review and adherence to safety protocols.

Q: What is the expected duration of action for a single dose of Butifeno?

The duration of the therapeutic effect can vary based on the specific form of the medicine. For the ophthalmic (eye drop) solution, studies indicated that the effect is observed to last for at least 8 hours after a single application. This information helps describe the expected period of relief.

Q: Is it necessary to have regular check-ups while taking Butifeno?

Official guidelines from health authorities often suggest that a doctor evaluate a patient's progress at regular appointments. These visits are used to evaluate if the medicine is working as expected and to help determine if the treatment regimen should be continued.

Q: What is the meaning of the boxed warning, if Butifeno has one?

A Boxed Warning, also known as a Black Box Warning, is a mandatory regulatory notification primarily used by the FDA. The warning is designed to call special attention to serious or potentially life-threatening risks associated with the drug. This designation acts as a clear, high-priority communication tool for critical safety information.

Q: Is Butifeno a controlled substance?

Butifeno (Ketotifen) is classified as not a controlled medication by the Drug Enforcement Administration (DEA) and other regulatory bodies. This classification indicates that the drug is not subject to the federal regulations governing substances with a recognized potential for abuse or dependency.

Q: How long does Butifeno stay in the system after the last dose?

Research into the way the body processes the oral form of this medicine (pharmacokinetics) suggests an elimination process occurs over time. A small study conducted in men indicated that the average time for the drug concentration to drop by half (elimination half-life) is approximately 12 hours.

How should Butifeno be stored and disposed of?

How to Store and Dispose of Butifeno

Butifeno (Ketotifen Fumarate) must be stored strictly according to regulatory specifications to maintain its stability. The product requires storage at Controlled Room Temperature, which is generally defined as 20 C to 25 C (68 F to 77 F), with protection from excessive heat and moisture.

It is mandatory to keep the medicine out of the sight and reach of children and to store it in its original, tightly closed container. Liquid forms, like the ophthalmic solution, may have specific stability limits after opening.

Disposal must follow official procedures. Unused or expired Butifeno should be taken to a medicine disposal site, or if unavailable, mixed with an undesirable substance, sealed, and placed in household trash. Do not flush the product down the toilet or pour it into drains.

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

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