Influbene N

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Influbene N

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 Influbene N

Influbene N is a synthetic, fixed-dose combination medicine classified as an Over-the-Counter (OTC) preparation, formulated for the oral, concurrent multi-symptom relief of acute common cold and flu discomfort. Its identity is founded upon the synergistic presence of three distinct active pharmaceutical ingredients (APIs).

Quick Facts
Active Ingredient Acetaminophen, Guaifenesin, Phenylephrine Hydrochloride
Form Powder for oral solution, Tablet
Pharmacological Class Analgesic, Antipyretic, Expectorant, Sympathomimetic Decongestant
Common Use Multi-symptom relief from cold/flu
Origin Synthetic

1. Defining the Pharmaceutical Class and Type

Influbene N is structurally defined as a combination product, integrating an analgesic and antipyretic, an expectorant, and a sympathomimetic decongestant into a single preparation. The primary component, Acetaminophen (Paracetamol), is widely recognized for its role in reducing fever and pain. Acetaminophen's primary pharmacological action is pain relief and temperature reduction. This combination is specifically positioned for daytime relief, as it excludes sedating antihistamines often found in alternative nighttime cold remedies, a key differentiating feature.

2. Active Components and Dosage Form

The active core of the medicine consists of Acetaminophen, the pain and fever reducer; Guaifenesin, which belongs to the class of expectorants; and Phenylephrine Hydrochloride, a nasal decongestant that works by reducing blood vessel swelling in the nasal passages. Guaifenesin works by thinning mucus and increasing the volume of phlegm in the respiratory tract. This expectorant ingredient specifically helps loosen mucus for easier clearance from the airways. Influbene N is typically supplied as a powder for oral solution in a sachet, which is designed for oral administration upon reconstitution into an aqueous solution.

3. General Therapeutic Purpose and Functional Benefit

The general therapeutic purpose of Influbene N is to reduce the overall symptomatic load associated with the common cold or influenza. The combination specifically addresses both systemic and localized issues: it targets fever and generalized body aches, while simultaneously acting to thin and loosen bronchial phlegm and relieve uncomfortable nasal congestion. This functional benefit provides comprehensive symptomatic management, aiming to mitigate the feeling of illness caused by the viral infection.

Regulatory References

  1. Acetaminophen: MedlinePlus Drug Information
  2. Guaifenesin: MedlinePlus Drug Information

What side effects are possible with Influbene N?

Possible Side Effects and Safety Information

The officially documented safety profile for this fixed-dose combination, which includes Acetaminophen, Guaifenesin, and Phenylephrine Hydrochloride, is classified according to frequency and the body system affected, consistent with regulatory standards.

Adverse Reactions by System-Organ Class

The most commonly listed adverse reactions affect the Nervous System and Gastrointestinal System. Common reactions include dizziness, headache, nervousness, restlessness, and insomnia. Gastrointestinal effects such as nausea and upset stomach may also occur.

Reactions affecting the Cardiac and Vascular Systems are also documented, primarily related to the Phenylephrine component. These include elevated blood pressure (hypertension) and changes in heart rhythm (tachycardia or palpitations).

Serious Adverse Reactions and Key Constraints

The regulatory label includes prominent warnings for rare but serious events. The primary serious risk is Severe Hepatotoxicity (liver damage) associated with Acetaminophen, especially when daily dose limits are exceeded or if taken with other acetaminophen-containing products. Rare Severe Cutaneous Adverse Reactions (SCARs), such as Stevens-Johnson Syndrome, are also documented.

Use is strictly contraindicated in individuals currently taking or having recently discontinued Monoamine Oxidase Inhibitors (MAOIs). Safety constraints also advise caution for patients with pre-existing conditions, including uncontrolled hypertension, heart disease, diabetes mellitus, and severe hepatic impairment.

This safety information provides a high-level overview of the risks defined by regulatory authorities, distinguishing between frequent, non-serious effects and rare, clinically significant reactions associated with the medicine’s components.

Overdose and Emergency Response

Overdose and when to seek help

The official overdose warning for this combination product is centered on the potential for severe, life-threatening outcomes primarily associated with the Acetaminophen component. The label states that severe liver damage may occur following an overdose, and this can lead to liver failure and ultimately death.

Overdose Scope Official Regulatory Statement
Documented Manifestations Initial symptoms may be nonspecific or delayed and include nausea, vomiting, sweating, or loss of appetite. Later symptoms of severe toxicity can include jaundice (yellowing of the skin/eyes) and confusion.
Severe Outcomes Severe liver damage, liver failure, and death are officially documented outcomes of overdose, particularly when the maximum daily dose is exceeded.
Dose-Related Factors Severe damage may occur if a person takes more than 4,000 mg of acetaminophen in 24 hours, takes it with other drugs containing acetaminophen, or consumes 3 or more alcoholic drinks every day [1.1, 2.5].
Antidote N-acetylcysteine (NAC) is the specific antidote for Acetaminophen overdose and is administered in a hospital setting.

Immediate Action and Required Help-Seeking:

The regulatory labeling mandates urgent medical intervention. Quick medical attention is critical for adults as well as for children even if you do not notice any signs or symptoms [1.1]. In case of a suspected overdose, one must get medical help or contact a Poison Control Center right away [1.1].

Therapeutic Uses of Influbene N

What Influbene N Treats: Main Uses and Benefits

Influbene N is commonly used across conditions presenting with acute episodes, such as the common cold or flu, where multiple symptoms may intensify temporarily. The clinical purpose is to provide supportive relief for the range of symptoms that cluster during these viral illnesses. This medication is applied across therapeutic domains where additional symptomatic support is needed.

Core Symptom Management

It helps address symptom clusters related to physical discomfort and systemic imbalance, including fever, headache, minor aches and pains, nasal congestion, and sinus pressure. Furthermore, it is relevant for easing symptoms linked to lower airways, particularly a productive cough associated with thick bronchial secretions or phlegm. By helping to manage these symptoms, Influbene N contributes to improved overall comfort and assists with maintaining functional stability during temporary symptomatic periods.


Quick Fact: Symptomatic Relief
Targeted Relief Used for managing fever, aches, nasal congestion, and productive cough.
Clinical Context Applied in clinical settings that involve acute or unstable symptom patterns.
Patient Benefit Supports general well-being during symptomatic phases.

Regulatory References

  1. DailyMed (NIH) drug label for the combination

Eligibility and Restrictions for Use

Who Can and Cannot Use Influbene N?

This section describes the population eligibility rules for Influbene N, a combination medicine containing Acetaminophen, Guaifenesin, and Phenylephrine HCl, as officially documented in regulatory labeling.

Eligibility and Absolute Non-Eligibility

Classification Population Rule
Eligible Population Adults and adolescents 12 years of age and over who do not have a listed contraindication.
Contraindicated Children under 12 years of age must not use this product.
Contraindicated Patients with known hypersensitivity to any component (Acetaminophen, Guaifenesin, Phenylephrine, or excipients).
Contraindicated Patients taking a Monoamine Oxidase Inhibitor (MAOI), or within 14 days of stopping an MAOI, due to the Phenylephrine component.
Contraindicated Individuals using any other product containing Acetaminophen.

Conditional Use Restrictions

Official labeling requires consultation with a health professional before use for certain populations due to increased risk:

  • Patients with coexisting conditions, including heart disease, high blood pressure, thyroid disease, diabetes, or liver disease.
  • Patients with chronic respiratory issues, such as a chronic cough or a cough producing excessive phlegm.
  • Pregnant or breastfeeding women.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents define specific restrictions for co-administering Influbene N, a combination product containing Acetaminophen, Guaifenesin, and Phenylephrine HCl, with other substances.

Contraindicated and Restricted Combinations

The product is formally contraindicated for co-administration with Monoamine Oxidase Inhibitors (MAOIs), including use within two weeks of stopping an MAOI drug. This restriction is documented due to the risk of a serious interaction with the Phenylephrine component. Furthermore, it is restricted from use with any other product containing Acetaminophen to prevent exceeding the maximum daily dose, which can lead to severe liver damage.

Pharmacodynamic and Exposure-Altering Interactions

Co-administration with other sympathomimetic agents (e.g., other decongestants) can result in additive pharmacodynamic effects, officially documented as an increased risk of side effects such as elevated blood pressure. The Acetaminophen component may also cause an altered anticoagulant effect when combined with medicines like Warfarin, requiring consultation as stated in official labeling.

Substance and Population-Specific Interactions

Daily consumption of three or more alcoholic drinks is documented to increase the risk of severe liver damage associated with the Acetaminophen component. Official labeling also notes that older adults may exhibit increased sensitivity to the cardiovascular and central nervous system effects of Phenylephrine, and the liver damage risk is heightened in patients with liver disease when combined with alcohol.

Mechanism of Action

Influbene N exerts its physiological effects through the synchronized operation of three distinct mechanisms targeting core regulatory systems for temperature, pain signaling, vascular tone, and respiratory clearance.


Central Regulation of Pain Signaling and Thermoregulation

The analgesic component acts on the Central Nervous System (CNS) by inhibiting the synthesis of specific prostaglandins ( PGE2), primarily in the hypothalamus. This central inhibition dampens the molecular signaling that contributes to an elevated body temperature and modulates nociceptive pathways, influencing the body's thermal set point and the signaling of nociception.


Alpha-1 Agonism for Localized Vascular Control

The decongestant component directly targets and activates Alpha-1 (alpha1) Adrenergic Receptors located on the smooth muscle of blood vessels within the nasal mucosa. This agonism initiates a vasoconstriction cascade, which restricts blood flow to the affected tissues, contributing to the reduction of mucosal edema.


Modulation of Airway Secretion Viscosity

The expectorant component acts to modulate the fluid properties of bronchial secretions, utilizing both a reflexive parasympathetic response (triggered via gastric vagal receptors) and potentially direct stimulation of mucous glands. This dual action increases the volume and reduces the viscosity of the mucus, modulating the properties of secretions for mucociliary clearance.

Dosage and Administration Information

Administration Protocol for Influbene N

The usage of Influbene N, a fixed-dose combination product containing Acetaminophen, Guaifenesin, and Phenylephrine HCl, is determined by specific parameters. The standard method of administration for this product is the oral route, consistent with its formulation as both a tablet and a powder for oral solution.

Dosage and Frequency

The dosing schedule for adults and children aged 12 years and older is based on intermittent use, administered every 4 hours as needed for relief. The established instructions are not to exceed a maximum of 6 doses in any 24-hour period. This daily limit must strictly account for the Acetaminophen component, ensuring that the total intake of Acetaminophen from all sources does not exceed 4,000 mg (4 grams) within 24 hours.

Administration Specifics

Feature Procedural Instruction
Preparation Powder forms must be fully dissolved in water before administration. Liquid doses must be accurately measured using a dosage cup or equivalent device.
Age Restriction This specific maximum-strength formulation is not indicated for use in children under 12 years of age.
Duration Limit Use is strictly short-term. The established protocol includes consulting a health professional if symptoms persist beyond 7 days, or if fever continues for more than 3 days.

These constraints establish a standardized, short-term protocol for the use of the medicine, defining the required minimum interval between doses and the maximum acceptable daily intake.

Recent Clinical Evidence

Research evidence / Overview of studies for Influbene N

This overview is a descriptive summary of the research conducted on Influbene N (Acetaminophen, Guaifenesin, Phenylephrine) to understand how it has been evaluated in clinical and regulatory settings. The goal is to describe what research has explored about the medicine, the type of outcomes that were monitored, and what remains uncertain in the evidence landscape.


Evidence for Multi-Symptom Relief from Common Cold and Flu

Research into the combination product often uses short-term Randomized Controlled Trials (RCTs) to examine the outcomes related to overall symptomatic changes in conditions characterized by fluctuating or episodic manifestations like the common cold or flu. These studies were primarily evaluated in adults and older children (aged 6 and up). Findings describe patterns observed in the studies associated with the analgesic component.

Research on Decongestant Efficacy

Regulatory reviews that scrutinize data on the oral decongestant component, Phenylephrine, indicate mixed findings about the component's outcomes monitored at the over-the-counter (OTC) dose. Research has highlighted that the data does not currently support this component's effectiveness for the relief of nasal congestion.


Evidence for Relief of Productive Cough and Phlegm

The expectorant component, Guaifenesin, was studied for its role in cough and mucus in RCTs. Studies report that the expectorant component is associated with changes in mucus properties, which were observed in relation to clearance measurements. However, when monitoring cough frequency, the findings were mixed across various studies, suggesting that the evidence quality varies across studies.


What Remains Uncertain in the Research Landscape

Most efficacy trials are limited to short-term observation periods, typically lasting only 2 to 7 days. Because the follow-up durations were limited to these brief time intervals, long-term effects are not fully established. Additionally, the data for certain groups remain insufficient, particularly for very young children. While studies help show what has been observed so far in adults, the research landscape describes that the evidence base for the analgesic ingredient, which relates to pain and fever relief, is widely described in regulatory summaries as substantial.

Frequently Asked Questions (FAQ)

Common questions about Influbene N (FAQ)

Q: What is Influbene N and how does it work?

A: Influbene N is a combination medication used for the symptomatic relief of common cold and flu. It typically contains ingredients that help to:

  • Relieve pain and reduce fever (often a non-steroidal anti-inflammatory drug or paracetamol/acetaminophen).
  • Reduce nasal congestion (often a decongestant, such as pseudoephedrine or phenylephrine).
  • Block allergic symptoms like sneezing or watery eyes (sometimes an antihistamine).

The exact mechanism depends on the active ingredients present in the specific formulation of Influbene N.

Q: When is the best time to take Influbene N?

A: Influbene N is generally taken at the onset of cold or flu symptoms to manage discomfort, fever, and nasal congestion. It is typically dosed to provide relief throughout the day, often taken every four to six hours, or as directed by the product's packaging or a healthcare professional. It is important to not exceed the maximum recommended daily dose.

Q: Can I take Influbene N with other medications?

A: It is essential to check with a healthcare provider or pharmacist before combining Influbene N with any other medications. This is especially true for:

  • Other cold, flu, or pain relievers that may contain the same active ingredients (like paracetamol/acetaminophen or ibuprofen) to avoid accidental overdose.
  • Decongestants or antihistamines found in other products.
  • Blood pressure medications or certain antidepressants, as decongestants in Influbene N can sometimes interact with these.

Q: What are the common side effects of Influbene N?

A: Common side effects may include:

  • Drowsiness or dizziness (especially if it contains an antihistamine).
  • Dry mouth.
  • Nervousness or difficulty sleeping (due to a decongestant).
  • Stomach upset.

If you experience severe side effects, such as allergic reactions, rapid heartbeat, or persistent high blood pressure, stop taking the medication and seek medical attention immediately. Always read the patient information leaflet for a complete list of potential side effects.

How should Influbene N be stored and disposed of?

Official Storage and Disposal Requirements

This information reflects the storage, handling, and disposal instructions documented in official government regulatory sources, such as the NIH and public drug formularies.

Storage Category Requirement
Storage Conditions Store strictly according to the conditions stated on the product's package label.
Child Safety The medicine must be stored out of the reach and sight of children.

Disposal Instructions

Official guidelines define disposal based on quantity and setting:

  1. Household Quantities: Small amounts of surplus medicine may be discarded in the household trash. This requires mixing the medicine with an unpalatable substance, such as wet coffee grounds or cat litter, and sealing it in a plastic bag before placing it in the trash.
  2. Professional Disposal: Non-household quantities or contaminated packaging must be managed by a licensed professional waste disposal service.

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

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