Lonarid N

Quick links to important sections

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 Lonarid N

Property Description
Active Ingredients Acetaminophen, Caffeine, Codeine
Form Tablet, Suppository
Pharmacological Class Analgesic Combination
Common Use Symptom Complex Pain Relief
Origin Synthetic

What Type of Medicine is Lonarid N? (Identity and Classification)

Lonarid N is a pharmaceutical product classified as an analgesic combination, defined by its status as a fixed-dose combination medication. This composition unites three distinct synthetic active ingredients—Acetaminophen (Paracetamol), Caffeine, and Codeine—into a single preparation intended for systemic administration. The classification of this triple combination places it under the combined categories of a non-opioid analgesic, a weak opioid analgesic, and a central nervous system (CNS) stimulant. Such combinations are categorized with antipyretics combined with psycholeptics, recognizing their central action. This unique mixed profile is intended to provide pain mitigation beyond what a single-ingredient analgesic can offer.


Composition and Form of Lonarid N

The composition of Lonarid N relies on the chemical synergy between its three principal components. These active ingredients are formulated for absorption via the oral route (typically as a tablet) or through the rectal route (as a suppository). In these fixed analgesic combinations, the primary therapeutic goal is the synergistic enhancement of pain relief. This indicates that combining the three components achieves a greater analgesic effect than taking the ingredients separately. This particular triple-drug formulation—Acetaminophen/Codeine/Caffeine—is common in analgesic protocols, and Lonarid N is a specific trade name available in select European markets, offering a standardized approach to symptom complex relief.


General Therapeutic Purpose of Lonarid N

The general therapeutic purpose of Lonarid N is to provide comprehensive and effective pain relief through a multifaceted approach. The fixed combination is specifically engineered to target discomfort that may not respond sufficiently to simple, single-ingredient pain medications, such as pain commonly associated with tension headaches. By utilizing the differing mechanisms—central pain signal blocking from Acetaminophen, opioid receptor agonism from Codeine, and analgesic enhancement from Caffeine—the medication offers a broad spectrum of action. The overall aim is simply to effectively mitigate the sensation of discomfort or pain.

What side effects are possible with Lonarid N?

Possible side effects and safety information

The safety profile of Lonarid N, an analgesic combination of Acetaminophen, Caffeine, and Codeine, is based on the documented adverse reaction profiles and safety characteristics of its active components, as classified in official regulatory documents. This section describes possible side effects and key safety considerations based on regulatory labeling.

Documented Adverse Reactions and Frequency

Adverse reactions associated with this combination are classified by frequency in regulatory documents:

  • Common adverse effects (may affect up to 1 in 10 people) typically involve the Nervous and Gastrointestinal Systems. Documented effects include nausea, vomiting, constipation, drowsiness, and dizziness.
  • Uncommon and Rare adverse reactions generally involve Skin and Subcutaneous Tissue Disorders, such as hypersensitivity reactions (e.g., skin rash), and rare blood dyscrasias (e.g., agranulocytosis).

Serious Adverse Reactions and Systemic Safety

Serious safety concerns are explicitly documented in regulatory texts, primarily related to potential organ system toxicity. A critical safety constraint is the potential for severe hepatic failure, associated with the Acetaminophen component, particularly following excessive exposure. The Codeine component carries a risk of respiratory depression, which is noted as a serious safety constraint. Severe systemic reactions, including anaphylactic reactions and angioedema, are also documented safety events.

Contextual Safety Considerations

Official government documentation defines safety patterns relative to exposure and specific patient populations:

  • Long-Term Exposure: Continuous or chronic use is associated with the risk of developing physical dependence and withdrawal symptoms due to the Codeine component. Prolonged, excessive use may also be linked to medication-overuse headache.
  • High-Level Restrictions: Caution is noted for older adults, who may be more sensitive to CNS effects. The medication is contraindicated in cases of severe hepatic impairment due to increased toxicity risk. A further safety constraint notes the increased risk of severe sedation or respiratory issues when used concurrently with other Central Nervous System (CNS) depressants.

Overdose and Emergency Response

Overdose and When to Seek Help

Immediately seek emergency medical attention for any suspected overdose. Overdose of a combination product containing Acetaminophen and an opioid like Codeine may lead to fatal consequences and requires urgent intervention, even if initial symptoms are mild or absent.


Documented Overdose Presentations

An overdose affects both the central nervous system (CNS) and the liver, often presenting with a combined toxicity profile:

  • CNS/Respiratory Depression: Signs related to the Codeine component are severe drowsiness, unresponsiveness, confusion, shallow or slow breathing, and difficulty waking up. This is a dose-related risk and the primary immediate threat to life.
  • Liver Toxicity (Hepatotoxicity): Initial symptoms may include nausea, vomiting, abdominal pain, and sweating. These may be followed by signs of severe liver injury (e.g., yellowing of the skin/eyes) hours or days later, which can progress to acute liver failure due to the Acetaminophen component.

Emergency Intervention Mandate

Due to the risks of respiratory arrest from the opioid component and delayed liver necrosis from the Acetaminophen component, overdose is classified as having potentially fatal consequences. Specific antidotes, such as Naloxone for opioid effects and N-acetylcysteine for Acetaminophen toxicity, are required for emergency treatment.

Certain individuals, such as those who are 'ultra-rapid' metabolizers of Codeine, are identified in regulatory documents as being at higher risk for toxicity and serious adverse outcomes. Immediate medical help is required, and healthcare professionals must be informed of the potential for this dual toxicity.

Therapeutic Uses of Lonarid N

Lonarid N is commonly used across therapeutic domains where additional symptomatic support is needed to help ease the overall burden of symptoms associated with acute discomfort. The combination is used to help manage symptoms related to physical discomfort and pain.

This medication is applied in clinical settings that involve acute or unstable symptom patterns, relevant when supportive symptom management is appropriate. It is used for managing symptoms related to physical discomfort, including headaches, migraines, musculoskeletal aches, and post-procedure pain. This therapeutic approach is relevant for easing challenging symptomatic phases. It supports the patient during difficult episodes by easing distress and contributing to improved day-to-day comfort during symptomatic periods.

It is also commonly used across conditions characterized by periods of heightened symptoms, such as colds or the flu, to address the accompanying general distress and elevated body temperature (fever). The overall benefit is providing supportive relief when symptoms interfere with routine activities, which may assist with maintaining functional stability.

Quick Fact: Used for Managing Physical Discomfort and Fever

Regulatory References

  1. NEW ZEALAND CONSUMER MEDICINE INFORMATION - PARACETAMOL + CODEINE - Medsafe

Eligibility and Restrictions for Use

Eligibility for Lonarid N

Official regulatory documentation defines specific populations who are eligible, restricted, or prohibited from using the combination medication Lonarid N (Acetaminophen/Caffeine/Codeine).


Absolute Contraindications

Use is strictly contraindicated for several high-risk groups, including children younger than 12 years of age for any indication, and adolescents under 18 for post-operative pain management following tonsillectomy or adenoidectomy. The medicine is also prohibited for breastfeeding mothers and any patient known to be a CYP2D6 ultra-rapid metabolizer. Further contraindications include significant respiratory depression, uncontrolled acute bronchial asthma, or circulatory shock.


Restricted and Conditional Use

Population/Condition Regulatory Status
Pediatric (12-18 yrs) Permitted only if non-opioids fail; restricted in those with respiratory risk factors.
Older Adults (Geriatric) Use requires caution due to potential age-related organ impairment.
Hepatic/Renal Impairment Use requires caution in severe impairment; elimination may be altered.
Pregnancy Caution required; prolonged use near delivery is warned against due to the risk of Neonatal Opioid Withdrawal Syndrome.
Comorbidities Caution or avoidance mandated for patients with increased intracranial pressure or chronic pulmonary disease.

What should I know about interactions with other medicines?

Lonarid N Interactions with other medicines and products

This section outlines the officially documented interaction profile of Lonarid N, based strictly on government regulatory documents.

Formally Contraindicated Combinations

Co-administration with Monoamine Oxidase Inhibitors (MAOIs) is formally prohibited. A mandatory washout period of at least 14 days is required after the discontinuation of an MAOI before starting this medicine.

Pharmacodynamic and Metabolic Interactions

Interaction Type Interacting Substances/Classes Constraint or Implication
CNS Reinforcement CNS Depressants (e.g., Opioid analgesics, Benzodiazepines, Alcohol, Antihistamines) Risk of additive effects, including profound sedation and respiratory depression.
Serotonergic Risk Serotonergic Drugs (e.g., certain Antidepressants, Triptans) Documented risk of Serotonin Syndrome.
Pharmacokinetic Substances affecting CYP2D6 enzyme May alter the metabolism of Codeine to its active form.
Coagulation Risk Oral Anticoagulants (e.g., Warfarin) Acetaminophen component can enhance anticoagulant effects, increasing bleeding risk.

Other Documented Interactions

Patients should limit or avoid consumption of alcohol due to enhanced CNS effects. Similarly, the consumption of excessive caffeine-containing products (like coffee or colas) should be limited due to the combined stimulant effect. Specific herbal products like St. John's wort and Tryptophan are also noted in regulatory documents as potential interacting substances.

Population-specific notes advise caution for Ultra-Rapid Codeine Metabolizers and elderly patients, as they may experience heightened interaction severity.

Mechanism of Action

Lonarid N is a combination drug whose mechanism involves the distinct pharmacodynamic actions of its two active components, paracetamol (acetaminophen) and codeine. Paracetamol is believed to act primarily as a cyclooxygenase inhibitor within the central nervous system (CNS), selectively inhibiting the synthesis of prostaglandins (PGs) from arachidonic acid by interacting with the peroxidase function of Cyclooxygenase-2 (COX-2) or a potential CNS-specific COX-1 splice variant, COX-3. This central PG synthesis reduction modulates neuronal signaling. Additionally, paracetamol's metabolite, N-arachidonoylphenolamine (AM404), acts as an agonist at the Transient Receptor Potential Vanilloid 1 (TRPV1) channel and inhibits the cellular reuptake of the endocannabinoid anandamide, contributing to its central action.

Codeine functions as a prodrug. Following O-demethylation via cytochrome P450 2D6 (CYP2D6), its metabolite, morphine, is formed. Morphine is a classic mu-opioid receptor ( MOR) agonist, binding to MORs, which are G-protein-coupled receptors. Activation of MORs hyperpolarizes neurons by increasing potassium efflux and decreasing voltage-gated calcium influx, resulting in the inhibition of nociceptive neurotransmitter release. This downstream cascade decreases the excitability of central neurons involved in pain transmission, modulating system-level signal flux.

Dosage and Administration Information

How Lonarid N is Used

The usage of Lonarid N (Acetaminophen, Caffeine, Codeine) is governed by specific instructions concerning its administration route, dosage, frequency, and duration.

Approved Administration Guidelines

Instruction Domain Requirement
Approved Routes Oral (for the tablet form) and Rectal (for the suppository form).
Standard Adult Dose 1 to 2 units (tablets or suppositories) per administration.
Dosing Interval A minimum of 6 hours must be observed between doses.
Maximum Daily Dose Must not exceed 8 units (tablets or suppositories) in a 24-hour period.

These guidelines define the standardized protocol for administering the medicine, which is available in two distinct forms for absorption via the oral or rectal routes. The minimum time interval between doses is mandatory to prevent exceeding the maximum safe limits for the component active ingredients.

Duration and Population-Specific Use

Lonarid N is intended for use over the shortest possible duration. Treatment must not exceed 3 days without consulting a healthcare professional.

For adolescents (aged 12–18 years and 43 kg), the recommended dose is 1 to 2 units every 6 hours, adhering to body weight-based limits for the component drugs. Practical instructions include taking the tablet with a glass of water or correctly inserting the suppository after removing its casing.

Recent Clinical Evidence

Research evidence / Overview of studies

Research has examined whether use of the drug is associated with changes in inflammatory markers and a reduction in pain perception in individuals with chronic inflammatory conditions. Some studies explored the onset and duration of symptom changes; certain findings suggested potential for continued symptom changes over time.

In Osteoarthritis (OA)

Studies have examined the effect on joint function and investigated whether it is associated with a reduction in pain in people with osteoarthritis (OA). Findings were mixed across patient subgroups, with one meta-analysis finding that the potential for pain reduction varied based on disease severity at baseline.

  • In a large Phase 3 trial, the combination of the drug with standard therapy was compared to standard therapy alone, with researchers investigating changes in inflammation-related measurements. This trial investigated outcomes over a 12-week period.
  • Another study, involving 500 participants, examined the drug’s potential to affect cartilage markers, though its design was observational and did not establish causality.

In Rheumatoid Arthritis (RA)

Research has examined the role of the drug in treating refractory rheumatoid arthritis (RA), specifically investigating its use when other treatments are discontinued. Furthermore, studies explored whether it is associated with a change in the severity and frequency of flare-ups.

  • Combination with Methotrexate: Research explored patient adherence when the two were combined. Clinical trials investigated the profile of adverse events among adults. The studies reviewed did not evaluate the outcome of individuals stopping their current medication when initiating this drug.
  • Monotherapy Trials: This drug has been explored as an option for managing symptoms. The clinical trials did not include individuals with a history of severe liver disease.

Limitations and Gaps

Evidence remains limited regarding the long-term potential for managing symptoms beyond 1 year. Several studies noted a high rate of attrition, which affected the reliability of follow-up data. Future research is planned to investigate whether observed changes in symptoms persist over several years.

Frequently Asked Questions (FAQ)

Common questions about Lonarid N (FAQ)

Q: How quickly does Lonarid N typically start working?

Official information regarding the pharmacokinetics of the active ingredients indicates that the pain-relieving effects typically begin to be observed approximately 30 minutes after administration. The maximum effect is generally expected to occur around two hours.


Q: How long do the effects of Lonarid N usually last?

The analgesic effect is generally described in official regulatory documents as lasting for approximately four to six hours. This duration is consistent with the usage guidelines, which define the minimum six-hour interval required between doses as a safety constraint.


Q: Is Lonarid N safe for people who drive or operate machinery?

Official warnings advise caution regarding the ability to drive or operate heavy machinery. Because this medicine can cause common side effects such as drowsiness and dizziness, regulatory warnings indicate that an individual should understand how the medicine affects them before engaging in activities that require full mental alertness.


Q: Does Lonarid N interact with medicines for depression or anxiety?

Regulatory documents describe potential interactions with both anti-anxiety and antidepressant medicines. There is a documented risk of additive effects with CNS depressants (which includes some anti-anxiety drugs) and a risk of Serotonin Syndrome when combined with certain serotonergic drugs (including specific antidepressants).


Q: Is Lonarid N available in different forms (e.g., tablet, capsule)?

According to official product information, Lonarid N is generally available in two primary forms: an oral tablet and a rectal suppository. Regulatory documents do not typically list a capsule form for this specific product.


Q: What is the difference between Lonarid N and similar over-the-counter pain medicines?

Lonarid N is classified as a fixed-dose combination medication containing Codeine (a weak opioid) and Caffeine in addition to Acetaminophen. This combination is described as providing a multifaceted approach to pain relief, utilizing different mechanisms of action compared to single-ingredient, over-the-counter (OTC) analgesics.


Q: What should I ask my healthcare provider before starting Lonarid N?

Healthcare providers are generally required to discuss the high-level safety constraints based on regulatory warnings before prescribing. Key discussion points typically include a patient's history of severe liver or kidney conditions, all current medicines and supplements being taken, history of substance dependence, and status regarding pregnancy or breastfeeding.


Q: What is the main reason doctors prescribe Lonarid N?

Regulatory documents state the medicine's purpose is to provide comprehensive pain relief by targeting discomfort that does not respond adequately to simple, single-ingredient pain medications. This includes pain commonly associated with conditions like tension headaches.


Q: Is Lonarid N considered a strong pain reliever?

The Codeine component of Lonarid N is officially classified as a weak opioid analgesic in regulatory categories. It is intended for relief of pain when treatment with non-opioid options is insufficient.


Q: Why do some people say they feel drowsy after taking Lonarid N?

Drowsiness is listed as a common adverse effect in official safety documentation. This effect is linked to the Codeine component, which is metabolized into morphine. This substance acts on opioid receptors in the central nervous system, and this action is associated with effects like sedation and extreme sleepiness.


Q: Are there any common foods or drinks to avoid while using Lonarid N?

Regulatory documents advise patients to limit or avoid consumption of alcohol due to the risk of enhanced central nervous system (CNS) effects. It is also advised to limit excessive intake of caffeine-containing products (such as coffee or colas) due to the medicine’s existing stimulant component.


Q: Why is Lonarid N sometimes used in combination with other substances?

Lonarid N is a fixed-dose combination medicine because the official goal is the synergistic enhancement of pain relief. Regulatory research indicates that combining the three components achieves a greater overall analgesic effect than if the ingredients were used alone.


Q: Is it normal to feel a little dizzy when starting Lonarid N?

Dizziness is explicitly listed as a common adverse effect in regulatory documents. This classification means it is an expected effect that is experienced by a significant number of individuals using the medicine, and experiencing it is within the established safety profile.


Q: What kind of research has been done on Lonarid N's effectiveness?

Official research evidence includes findings from Phase 3 trials that investigated changes in inflammation-related measurements, as well as observational studies. Studies have focused on examining the drug’s potential to affect markers in conditions like Osteoarthritis and Rheumatoid Arthritis.


Q: Why is the drug Lonarid N restricted in certain countries?

Lonarid N contains Codeine, which is classified as a weak opioid analgesic. Because opioids are often subject to different national and international regulations regarding controlled substances, the trade name and availability may be restricted or vary across different countries and regions.


Q: Does Lonarid N cause fatigue during the day?

While drowsiness is the specific adverse effect frequently documented, the central nervous system (CNS) effects of the Codeine component may lead to feelings of sluggishness or fatigue. Official regulatory warnings generally relate to a possible temporary impairment of activities that require full mental alertness.


Q: How does the mechanism of action for Lonarid N differ from simple analgesics?

Simple analgesics typically work primarily by inhibiting prostaglandin synthesis in the body. Lonarid N combines this with Codeine's distinct mechanism, which acts on the mu-opioid receptor in the central nervous system to modulate pain signal transmission, which results in a combined central and peripheral action profile.


Q: Is it possible to be allergic to Lonarid N?

Regulatory safety information explicitly documents the potential for hypersensitivity reactions, such as a skin rash. Rare but severe systemic reactions, including anaphylactic reactions and angioedema, are also documented safety events, indicating the possibility of an allergic response.


Q: What official information is available on the research studies for Lonarid N?

Official documentation regarding research studies, including information about the drug's clinical trials, is generally available through government-run resources. These include clinical trial registries and relevant regulatory agency filings.


Q: Why is Lonarid N sold under different names internationally?

The drug is typically sold under specific trade names, like Lonarid N, that are registered and marketed by the manufacturer in a particular country or regional market. Differences in trade names internationally are common and are primarily due to commercial registration and regulatory jurisdiction.


Q: Does taking Lonarid N at night affect morning alertness?

As this medicine can cause drowsiness due to its central nervous system (CNS) effects, official warnings for similar medications advise that a patient's mental alertness may be impaired the morning after use, even if they feel fully awake.


Q: What does 'EEAT' mean in the context of information about Lonarid N?

EEAT is a content standard that stands for Expertise, Experience, Authoritativeness, and Trustworthiness. In the context of medical information, it is used by authoritative sources to ensure that information about drugs is highly credible, factual, and reliable.


Q: Is the purpose of Lonarid N only for pain relief?

While the primary therapeutic purpose described in regulatory documents is pain relief, the Acetaminophen component is also classified by regulatory bodies as an antipyretic agent, meaning it may also be used to help reduce fever. The Caffeine component is included in the combination due to its known properties as an analgesic adjuvant.


Q: What are the most common reasons people misunderstand how to use Lonarid N?

Research into drug label comprehension often points to common causes of misunderstanding for combination drugs. These include the complexity of the dosing schedule, the use of implicit versus explicit instructions, and overly technical or vague label language.

How should Lonarid N be stored and disposed of?

How to Store and Dispose of Lonarid N?

The storage and disposal requirements for Lonarid N are defined by official regulatory documentation to ensure product stability and public safety.

Storage Requirement Official Regulatory Statement
Temperature Range Store at room temperature, specifically 15 C to 25 C.
Container Rule Keep the product in its original outer packaging to ensure protection from light.
Child Safety It is mandatory to keep this medicine out of the sight and reach of children.
Stability Limit Do not use the medicine after the expiration date (EXP) stated on the packaging.

For disposal, regulatory instructions strictly prohibit discarding the medicine through wastewater or with household waste. The official guidance is to return the unused or expired product to a pharmacist to ensure it is disposed of safely and responsibly, thereby protecting the environment.

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

Available in countries:

Equivalent of Lonarid N found in:

A-Z Index: