Efferalgan

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Efferalgan

Medically reviewed

Laura Arias

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 Efferalgan

Property Description
Active Ingredient Paracetamol (Acetaminophen)
Form Effervescent Tablets, Granules, Suppositories, Standard Tablets
Pharmacological Class Analgesic (Pain Reliever) and Antipyretic (Fever Reducer)
Common Use Symptomatic relief of mild to moderate pain and fever
Origin Synthetic chemical

What Type of Medicine is Efferalgan?

Efferalgan is a widely recognized brand-name medication whose primary active ingredient is Paracetamol, also known as Acetaminophen in some regions. It is clinically recognized across many international health systems as a versatile, first-line choice for general discomfort and fever management. Pharmacologically, it is classified as a non-opioid analgesic and an antipyretic. Paracetamol is a synthetic compound that acts centrally within the body, offering a therapeutic profile distinct from Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) because it carries negligible anti-inflammatory properties.

Composition and Available Forms

Efferalgan is differentiated from generic paracetamol primarily by its extensive range of specialized dosage formats designed for flexible and rapid administration. While fundamentally a single-ingredient drug, its range includes effervescent tablets and granules, which allow for quick absorption once dissolved in water. The availability of suppositories further allows for the rectal route, which is crucial for patients, such as children, who may be unable to take medication orally due to vomiting. These diverse forms are important in ensuring appropriate use across different patient needs.

Efferalgan's General Therapeutic Purpose

Efferalgan’s general purpose is to provide safe and reliable relief from mild to moderate pain and to quickly reduce fever associated with common ailments. Its action on the central nervous system to dampen pain signals and reset the body’s elevated temperature setting makes it a foundational element in medicine cabinets globally for managing common symptoms such as headaches, muscle aches, and fevers accompanying colds or flu.

Regulatory References

  1. Acetaminophen

What side effects are possible with Efferalgan?

Possible Side Effects and Safety Information

The safety profile of Efferalgan, which contains paracetamol, is primarily structured around the risk of hepatotoxicity (liver damage), particularly when taken in high or supra-therapeutic doses. This risk is dose-dependent and can lead to severe and potentially fatal acute liver failure and necrosis.

Officially Documented Adverse Reactions

Official regulatory documents classify adverse reactions, which include very rare but serious events affecting multiple body systems. The frequency classifications of Rare (1/10,000 to 1/1,000) and Very Rare (less than 1/10,000) are used for some clinically significant effects. [Table of Adverse Reactions]

System-Organ Class Clinically Significant Adverse Reactions
Hepatobiliary Disorders Liver necrosis, Acute liver failure (dose-dependent)
Blood and Lymphatic Disorders Thrombocytopenia (low platelets), Leukopenia (low white blood cells), Neutropenia
Immune System Disorders Anaphylactic shock, Angioedema
Skin Disorders Severe Cutaneous Adverse Reactions (SCAR) including Stevens-Johnson Syndrome (SJS), Toxic Epidermal Necrolysis (TEN), Acute Generalized Exanthematous Pustulosis (AGEP)

Safety Restrictions and Limitations

Dose-Related Risk: The risk of hepatotoxicity mandates strict adherence to the prescribed maximum daily dose.

Specific Populations: Caution or dose reduction is required for patients with hepatic insufficiency, severe renal impairment, chronic alcoholism, or chronic malnutrition due to an increased risk of toxicity.

Drug Interactions: Official labeling notes that taking the maximum dose (4 grams per day) for an extended duration (at least 4 days) while using Vitamin K antagonists (such as warfarin) may increase the anticoagulant effect, raising the risk of hemorrhage.

Overdose and Emergency Response

Official Regulatory Information on Overdose

Immediate Emergency Action Required

Regulatory authorities mandate that you seek immediate medical attention for any suspected overdose of Efferalgan (Paracetamol/Acetaminophen), regardless of whether symptoms are currently present. Get medical help right away. The risk of severe, delayed toxicity is documented even if the person initially feels well.

Documented Overdose Manifestations Severe / Life-Threatening Outcomes
Nausea, Vomiting, Abdominal pain Acute Liver Failure (Hepatotoxicity)
Pale appearance, Sweating (non-specific) Death or necessity of Liver Transplantation
Symptoms may be delayed for several days Kidney failure, Coagulopathy (Blood clotting problems)

Antidote and Required Monitoring

The specific, effective antidote for Paracetamol toxicity is N-acetylcysteine (NAC). Its administration is time-critical, with maximal efficacy when given within hours of ingestion. Management protocols require prompt measurement of the serum acetaminophen concentration and use of the Rumack-Matthew Nomogram to assess risk. Individuals with pre-existing Liver Disease or Alcohol Use Disorder are documented in regulatory sources as having an increased risk of severe toxicity.

Therapeutic Uses of Efferalgan

Efferalgan (Paracetamol/Acetaminophen) is commonly used for symptomatic relief from mild to moderate pain and is used for managing fever. It is applied across domains where additional symptomatic support is needed, providing support that helps ease the overall burden of symptoms associated with acute and episodic changes.

Acetaminophen (Paracetamol) is classified as an analgesic and antipyretic used to relieve mild to moderate pain and reduce fever. It is relevant for managing sudden, non-severe pain presentations, including common headaches, acute toothache, recurrent menstrual pain (dysmenorrhea), general muscle aches, and joint discomfort.

The medication is commonly used across conditions presenting with acute episodes or conditions marked by increased physiological stress, such as influenza-like illnesses or post-vaccination reactions. This application offers symptomatic relief that helps patients cope more steadily with symptom fluctuations.

“Applied in scenarios where additional management of discomfort is required, the medication provides support that helps ease the overall symptom load.”

Quick Fact: Symptom Domains Addressed

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Eligibility and Non-Eligibility Rules

Regulatory documents define specific population eligibility rules for using Efferalgan (Paracetamol/Acetaminophen), focusing on contraindications and underlying risk factors.

Classification Population or Condition
Absolute Contraindication Hypersensitivity to paracetamol or any excipient.
Severe hepatocellular impairment or severe active liver disease.
Use with Restriction/Caution Mild to moderate hepatic or renal impairment.
Chronic alcoholism, chronic malnutrition, or dehydration.
Patients with G6PD deficiency or low body weight (under 50 kg).
Pediatric Limitations Use is weight-based and subject to minimum age thresholds (e.g., some forms are contraindicated in children under 2 months or 4 kg).
High-strength adult formulations are typically not recommended for children under 12 to 15 years.
Pregnancy and Lactation Status Permitted when clinically necessary. Official recommendations advise using the lowest effective dose for the shortest possible duration during pregnancy.
Permitted during breastfeeding, as only small, non-clinically significant amounts are excreted in breast milk.

These eligibility rules establish absolute prohibitions based on allergies and severe organ failure, while specific cautions are required for populations with pre-existing conditions that increase the risk of toxicity, ensuring use is strictly aligned with the official regulatory safety profile.

What should I know about interactions with other medicines?

Interactions with other medicines and products — official regulatory information for Efferalgan


Interaction scope

Property Detail (Official Regulatory Information)
Medicinal product categories with documented interactions Oral Anticoagulants, Enzyme Inducers, Prokinetics, Bile Acid Sequestrants, and products containing Paracetamol/Acetaminophen.
Specific interacting medicines (if explicitly listed) Warfarin, Probenecid, Phenytoin, Carbamazepine, Rifampicin, Cholestyramine, Metoclopramide, Domperidone.
Mechanistic basis of interactions (only if stated in label) Inhibition of conjugation with glucuronic acid (Probenecid); reduction of absorption (Cholestyramine); acceleration of absorption (Metoclopramide/Domperidone).
Timing-based interaction rules (if applicable) Cholestyramine must be administered at least one hour before or several hours after Paracetamol to prevent reduced absorption.
Population-specific interaction notes (if applicable) The co-use with enzyme-inducing products or chronic alcohol use may increase the risk of hepatotoxicity. Severe renal impairment requires an extended dosing interval to prevent accumulation.
Interaction-related restrictions The co-administration of other Paracetamol-containing products is strictly prohibited to avoid dose accumulation and the risk of severe hepatotoxicity.
Food, alcohol, herbal product interactions Chronic Alcohol Use is documented to increase the risk of hepatotoxicity.

Interaction classifications (high-level)

Property Detail (Official Regulatory Information)
Interaction severity classification (as defined in official documents) Contraindicated (with other Paracetamol products); Clinically Significant (with Warfarin, Probenecid, and Enzyme Inducers).
Regulatory basis EMA Summary of Product Characteristics (SmPC), FDA Prescribing Information, and TGA Product Information.
Interaction-context constraints (as defined in official documents) The interaction with oral anticoagulants is clinically relevant when Paracetamol is used at high doses (4 g/day) for prolonged periods (4 or more days).

Resulting interaction structure

Official regulatory documents define the product’s interaction structure primarily through its metabolism and elimination pathways. Co-administration with Probenecid causes an increase in plasma concentration by officially inhibiting glucuronidation. Oral anticoagulants pose a pharmacodynamic risk, as prolonged use at high doses may increase the risk of bleeding. The profile mandates timing separation for agents like Cholestyramine that reduce absorption, and strictly prohibits co-administration with other Paracetamol products to manage the inherent toxicity risk.

Mechanism of Action

️ Central Modulation of Thermoregulation Pathways

This mechanistic domain involves the inhibition of Cyclooxygenase (COX) enzymes in the hypothalamus, the brain's temperature control center. By suppressing the synthesis of Prostaglandin E2 ( PGE2), the drug essentially resets the body's elevated thermal set-point. This physiological adjustment activates mechanisms like sweating and peripheral vasodilation, which promote heat loss and initiates mechanisms for the dissipation of core body heat.


Activation of Central Nociceptive Receptors

The drug's action on nociception involves a two-step process where the parent compound is converted into the active metabolite, AM404, within the CNS. AM404 subsequently modulates key central nociceptive-signaling pathways by activating the TRPV1 receptor and enhancing the activity of the body's own endocannabinoid system. This mechanism contributes to dampening the transmission of nociceptive signals traveling through the spinal cord, resulting in the central modulation of nociceptive input.


Mechanistic Limitation: Lack of Peripheral Anti-Inflammatory Action

The drug's mechanism for inhibiting COX enzymes is chemically constrained by the high concentration of peroxides found in tissues at the site of acute inflammation. This sensitivity means that while it works effectively in the CNS (low peroxide levels), the mechanism is significantly overridden in peripheral tissues. The resulting physiological consequence is minimal peripheral inhibition of prostaglandin synthesis. The mechanism is poorly suited for modulating physiological responses driven by high concentrations of inflammatory mediators.

Dosage and Administration Information

The administration of Efferalgan (Paracetamol/Acetaminophen) is strictly governed by principles detailed in official labeling, defining the route, dose, frequency, and duration of use. The medicine is approved for oral use (tablets, effervescent forms), rectal use (suppositories), and intravenous (IV) infusion, providing flexibility based on clinical need.


Administration Protocol

Property Official Instruction
Route & Forms Oral (tablets, effervescent), Rectal (suppositories), and IV (infusion).
Standard Adult Dose Single doses range from 500 mg to 1000 mg. The maximum total daily dose must not exceed 4000 mg from all sources.
Frequency & Interval Dosing must be systematic, requiring a minimum interval of 4 hours between doses to prevent accumulation.
Preparation Effervescent forms must be fully dissolved in water. Oral forms can be taken with or without food.
Duration Limit Use is generally limited to 5 days for pain or 3 days for fever without professional oversight, and rectal use should be as brief as possible.

Dosing Adjustments

Dosing is strictly weight-based for pediatric patients (typically 10 to 15 mg/kg per dose). For individuals with severe renal or hepatic impairment, the official protocol mandates a reduction in dose or a prolongation of the dosing interval to 6 or 8 hours, defining a necessary modification to the standard schedule. Patients must verify that no other product taken simultaneously contains paracetamol to stay within the total daily limit.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Efferalgan


Research Exploring Acute Pain Management

Research exploring the use of Efferalgan’s main ingredient, paracetamol, for short-term pain includes a large volume of short-term Randomized Controlled Trials (RCTs) and comprehensive meta-analyses. These studies were used in research exploring how symptoms change over time by focusing on adults experiencing different acute pain episodes. Research examined specific outcomes related to physical discomfort, including measuring changes in patient-reported pain intensity during the immediate hours following a dose.

Studies reported patterns observed in the evidence that applied across many acute pain types that are relevant in trials assessing short-term or episodic symptom patterns. The follow-up durations were limited in most core efficacy trials, meaning that while short-term changes are well-documented, long-term patterns are not well characterized.


Evidence for Fever Reduction (Antipyresis)

Research exploring short-term symptom changes related to fever was primarily conducted using RCTs and subsequent systematic reviews. These studies evaluated the substance against fever associated with conditions characterized by fluctuating manifestations. The studies included both adults and a large volume of research focused on children and infants, where the substance was studied in trials examining systemic or functional imbalance.

Comparative research was also studied for, which reported how temperature measurements varied when compared to other non-prescription fever-reducing substances. Certainty remains low regarding the reduction of fever in otherwise non-distressed adults, as most definitive research focuses on pediatric fever. Furthermore, the evidence base is centered on short-term physiological measurements, and long-term patterns on the underlying illness are not well characterized.


Research in Chronic or Recurrent Conditions

The research base for using this substance in chronic or recurrent pain conditions, such as osteoarthritis and certain types of tension headaches, is built on systematic reviews that synthesized intermediate-term RCTs. These studies monitored outcomes reflecting daily functioning and patient-reported outcomes describing perceived discomfort over periods of several weeks.

The studies report how symptoms evolved in the observed populations, and research describes measurements recorded concerning pain and physical disability scores. However, published findings were mixed, with many systematic reviews reported that the observed changes in pain and function scores for chronic joint discomfort may have been small. Research indicates that for chronic low back pain, the observed outcomes were often similar to those observed in control groups. Evidence quality varies across studies when examining chronic conditions, contributing to the overall uncertainty.

Key Studies & References

  1. Acetaminophen: Drug Information (MedlinePlus Drug Information)
  2. Clinical guidelines on the management of fever in children (National Institute for Health and Care Excellence - NICE)

Frequently Asked Questions (FAQ)

Common questions about Efferalgan (FAQ)


Q: How does the 'effervescent' format of Efferalgan change how it works compared to a regular tablet?

The official product information explains that effervescent forms must be dissolved in water before consumption. This format is often noted to facilitate faster absorption of the medicine into the body compared to standard tablets. It is also described as an option for individuals who may have difficulty swallowing pills.


Q: Does Efferalgan cause drowsiness or make you feel sleepy?

According to regulatory documentation, the standard, single-ingredient Efferalgan (containing only paracetamol) is generally not associated with drowsiness or sleepiness. However, combination products that include ingredients like the opioid analgesic Codeine may list drowsiness or dizziness as a potential side effect.


Q: Are there different types of Efferalgan (e.g., Efferalgan Codeine), and what is the difference in their active ingredients?

Yes, the product range includes different formulations. Some Efferalgan products are combination medicines that pair the active ingredient, paracetamol, with other substances, such as Codeine. These combination forms are generally indicated for the treatment of more severe pain.


Q: Does the effervescent tablet contain a lot of sodium (salt)?

Official product information states clearly that Effervescent tablets contain sodium. Regulatory documents note that the sodium content must be taken into account by patients on a controlled sodium diet. The specific quantity is listed on the official label or product information leaflet.


Q: Is it normal to see bubbles or foam when dissolving the tablet?

Yes, it is normal to see bubbles or foam when preparing the medicine. The effervescent format is specifically designed to release gas when placed in water, ensuring the tablet dissolves completely. Regulatory instructions require full dissolution before the solution is consumed.


Q: Can Efferalgan be taken alongside ibuprofen or aspirin?

Regulatory sources indicate that the active ingredient in Efferalgan (paracetamol) is generally compatible with other over-the-counter painkillers that do not contain paracetamol themselves. This includes medications such as ibuprofen or aspirin.


Q: Does Efferalgan affect the results of certain medical lab tests?

Official regulatory documents note that the active ingredient may interfere with the results of certain medical laboratory tests. This interaction has been noted with tests that measure levels of uric acid and blood sugar (glycemia).


Q: Can the effervescent tablet be swallowed whole instead of dissolved?

No. Official preparation instructions strictly state that the effervescent tablets must be completely dissolved in water prior to use. Official instructions state the product is required to be dissolved completely.


Q: What happens if a person taking Efferalgan misses a scheduled dose?

Regulatory guidelines emphasize the importance of strictly adhering to the minimum dosing interval and the maximum total daily dose. Regulatory guidelines note that taking a double dose is prohibited because it would violate the required minimum dosing interval.


Q: Is there any information about long-term use and potential cardiovascular side effects of the active ingredient in Efferalgan?

Official adverse event reports list some cardiovascular effects (e.g., hypotension, hypertension, tachycardia, peripheral edema). Regulatory documents, however, do not provide specific long-term cardiovascular risk statements related to chronic use.


Q: What is the difference between Efferalgan and the Efferalgan marketed for cough and cold?

Standard Efferalgan is a single-ingredient medicine that contains only Paracetamol. Products marketed for cough and cold symptoms are combination products that contain Paracetamol along with other medicines, such as a decongestant or cough suppressant.


Q: Can Efferalgan interact with herbal supplements?

Official guidance notes that there is limited regulatory information available to definitively confirm the safety of taking all complementary or herbal medicines at the same time as paracetamol.


Q: What are the typical symptoms of taking too much Efferalgan (overdose)?

According to regulatory documents, early symptoms of overdose (within the first 24 hours) may include nausea, vomiting, sweating, and feeling generally unwell. The most severe risk, acute liver damage, may not become clinically apparent until two to three days after the overdose.


Q: Why is Efferalgan often recommended as a first-line pain reliever?

The active ingredient in Efferalgan is recognized globally by major medical bodies (such as the WHO) as a foundational non-opioid analgesic. It is often noted as the first step in a structured approach for managing mild-to-moderate pain.


Q: Does the combination of paracetamol and codeine in some Efferalgan products pose a risk of dependence?

Yes, official regulatory warnings for Efferalgan products containing Codeine state that these medications are categorized as an opioid analgesic. As such, they carry a potential risk of causing both physical and psychological dependence.


Q: What are the contraindications listed for Efferalgan Codeine specifically?

Combination products containing Codeine have additional contraindications beyond the single-ingredient Efferalgan. These specific restrictions include use in individuals known to be ultra-rapid metabolizers of a certain enzyme (CYP2D6) and typically prohibit use in children following procedures like tonsillectomy.


Q: Does Efferalgan affect blood pressure or heart rate?

Official adverse event reports list both a decrease (hypotension) and an increase (hypertension) in blood pressure, as well as a rapid heart rate (tachycardia), as effects that have been noted in adverse event reports.

How should Efferalgan be stored and disposed of?

How to Store and Dispose of Efferalgan

Official regulatory documents define mandatory conditions for the storage and disposal of Efferalgan (Paracetamol/Acetaminophen) to ensure product stability and public safety.


Storage Requirements

Condition Regulatory Requirement
Temperature Store at a temperature not exceeding 30°C. The product must not be frozen.
Protection Must be stored protected from light and moisture.
Packaging Keep the medicine in the original container and, for effervescent forms, keep the container tightly closed.
Child Safety Must be kept out of the sight and reach of children.

Disposal Instructions

Disposal must adhere to official guidelines. Unused or expired medication should primarily be handled through official medicine take-back programs. The product must not be discarded in wastewater (flushed down the toilet or poured down the sink). If a take-back program is unavailable, the drug should be mixed with an undesirable substance, sealed in a bag, and then placed in the household trash.

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

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