Orphen

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Orphen

Treatment option: Pain

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 Orphen

Property Description
Active Ingredients Acetaminophen, Tramadol Hydrochloride
Form Tablet (Solid dosage form)
Pharmacological Class Combination Analgesic, Centrally Acting Analgesic
General Purpose Symptomatic relief of pain
Origin Synthetic (Fixed-Dose Combination)

What is Orphen and its Pharmacological Classification?

Orphen is a synthetic, fixed-dose combination (FDC) analgesic, typically a prescription-only medication (Rx), supplied as a tablet for oral administration. It is classified as a centrally acting analgesic because its components exert their effects primarily within the central nervous system to help manage the sensation of pain. This preparation integrates two distinct compounds—Acetaminophen, a non-opioid component, and Tramadol Hydrochloride, a centrally acting opioid component—into a single unit. This combination is identified under the ATC code N02AJ13, which categorizes its pharmacological role as an opioid analgesic combined with a non-opioid analgesic.


Composition: The Dual-Component Design

The identity of Orphen is defined by its two principal active ingredients (INN): Acetaminophen (Paracetamol) and Tramadol Hydrochloride. Both are products of chemical synthesis, establishing the product’s synthetic origin. This fixed-dose combination design is intended to provide additive or synergistic effects on pain relief, ensuring both components are delivered in a consistent, fixed ratio and offering a standardized approach for managing discomfort.


General Purpose of this Combination Analgesic

The general therapeutic purpose of Orphen is to provide symptomatic relief for pain in scenarios requiring a specialized approach. The rationale for this combination is to achieve an enhanced effect through a dual mechanism of action, targeting both the transmission and the central perception of pain signals more broadly than a single substance could achieve alone. This synergistic strategy is the core reason for its utilization when single-agent analgesics are insufficient, providing comprehensive coverage for discomfort across adult patient groups.

What side effects are possible with Orphen?

Possible Side Effects and Safety Information

The safety profile of this fixed-dose combination, containing Tramadol Hydrochloride and Acetaminophen, is formally structured by government regulatory bodies based on the incidence and nature of reported adverse reactions.

Officially documented adverse effects are grouped by frequency and the physiological system affected. According to clinical trial data summarized in regulatory documents, reactions classified as Very Common include nausea, dizziness, and somnolence. Reactions classified as Common include constipation, vomiting, dry mouth, headache, and pruritus. System-organ classes frequently involved include Gastrointestinal Disorders and Nervous System Disorders.

Serious Adverse Reactions and Key Constraints

The regulatory safety text highlights several serious adverse reactions. These include the potential for Serotonin Syndrome, Seizures, and Acute Liver Failure (Hepatotoxicity, particularly related to the Acetaminophen component). Life-threatening Respiratory Depression is noted as a key risk, with the highest incidence documented during the initiation of therapy or following a dose increase.

Official labeling defines specific population constraints. The medicine is contraindicated in patients with severe hepatic impairment due to the risk of acute liver failure. Use is also restricted in children younger than 12 years and is generally not recommended in patients with severe renal impairment. Furthermore, prolonged use during pregnancy is officially documented as carrying a risk of Neonatal Opioid Withdrawal Syndrome.

Overdose and Emergency Response

The official regulatory profile for Orphen (Acetaminophen/Tramadol combination) classifies overdose as potentially serious and life-threatening due to its dual toxicity profile. The clinical presentation involves two distinct toxicities: CNS and respiratory depression from the Tramadol component, and acute hepatic necrosis from the Acetaminophen component. Documented manifestations of overdose frequently include somnolence, miosis (pinpoint pupils), convulsions, nausea, and vomiting. Regulatory documents list the most severe outcomes as respiratory arrest, cardiovascular collapse, and potentially fatal hepatic failure.

The official guidance strictly mandates that immediate medical attention must be sought for any known or suspected overdose, regardless of the apparent presence of symptoms, owing to the potential for delayed, life-threatening liver damage. Contacting emergency services is required immediately. Management in a specialized setting includes necessary procedures such as gastric decontamination, continuous cardiorespiratory monitoring, and repeated assessment of plasma drug concentrations. Specific antidotes are detailed in the official prescribing information: N-acetylcysteine (NAC) is required for Acetaminophen toxicity, while Naloxone may be used to address severe Tramadol-induced respiratory symptoms. Patients with underlying hepatic impairment are noted in labeling to face an increased susceptibility to severe toxicity.

Therapeutic Uses of Orphen

What Orphen Treats: Main Uses and Benefits

Orphen is an analgesic combination commonly used for symptomatic relief in adults experiencing discomfort when additional management of discomfort is required. Its use is applied in addressing the severity and persistence of painful symptoms across specific clinical contexts.

This combination is considered relevant in situations where patients experience acute, severe pain and supportive symptom management is appropriate.

The medication is relevant in clinical settings marked by heightened patient distress, typically when symptoms related to physical discomfort are classified as moderate to moderately severe. It is commonly used across conditions characterized by periods of heightened symptoms such as acute postoperative discomfort, severe dental pain, or managing symptoms related to conditions like chronic low back pain and osteoarthritis. This combination provides support that helps ease the overall symptom load, contributing to improved comfort during difficult episodes.


Quick Fact: Relief for Pain Intensity

This combination is generally applied when symptoms that interfere with daily functioning are judged to be more substantial than what typical analgesic approaches effectively manage, assisting with maintaining functional stability during episodes of heightened discomfort.

Regulatory References

  1. DailyMed official FDA label for Tramadol/Acetaminophen

Eligibility and Restrictions for Use

Eligibility for Orphen: Official Regulatory Requirements

Orphen (Tramadol/Acetaminophen) eligibility is strictly defined by regulatory bodies, setting clear boundaries for patient use. The medicine is Contraindicated in several population groups and clinical states. Mandatory exclusion applies to all children younger than 12 years of age, and to adolescents younger than 18 following tonsillectomy or adenoidectomy surgery. Patients with severe hepatic impairment, significant respiratory depression, or acute intoxication with central nervous system depressants are also prohibited from use.

A key contraindication is concurrent use with Monoamine Oxidase Inhibitors (MAOIs) or within 14 days of their cessation. Eligibility is also restricted for those with a history of epilepsy not controlled by treatment. Use is not recommended during breastfeeding, and prolonged use in pregnancy carries the official risk of Neonatal Opioid Withdrawal Syndrome. Conditional use applies to older adults over 75 and individuals with moderate renal impairment, where special regulatory consideration is mandated.

What should I know about interactions with other medicines?

The official regulatory profile for Orphen is highly structured around preventing severe interactions related to central nervous system effects and metabolic function.

Documented Interaction Classifications

Classification Interacting Entity / Category
Formally Contraindicated Monoamine Oxidase Inhibitors (MAOIs), other Tramadol-containing products, or other Acetaminophen-containing products.
Timing Restriction MAOIs require a minimum 14-day washout period before starting Orphen.

Pharmacodynamic and Metabolic Interactions

Central Nervous System (CNS) Depressants and Alcohol are explicitly documented as increasing the risk of profound sedation and respiratory depression due to additive effects. Co-administration with Serotonergic Drugs (including SSRIs, SNRIs, and St. John’s Wort) is noted to increase the risk of developing Serotonin Syndrome.

Interactions affecting metabolic clearance involve CYP2D6 Inhibitors (e.g., fluoxetine) and CYP3A4 Inhibitors (e.g., ketoconazole), which reduce the clearance of the tramadol component. Conversely, the CYP3A4 Inducer Carbamazepine is noted to reduce the analgesic effect of tramadol, and this combination is not recommended.

Finally, the acetaminophen component carries a documented risk of increasing the anticoagulant effect of Coumarin Derivatives (e.g., Warfarin), potentially leading to an increased risk of bleeding.

Mechanism of Action

Orphen acts as a small molecule inhibitor, primarily targeting the NF-kappa B pathway. It binds non-covalently to the IKK complex (Inhibitor of kappa B Kinase), specifically IKK-beta, hindering its phosphorylation of the Ikappa B protein. This inhibition stabilizes the Ikappa B/ NF-kappa B complex in the cytoplasm, preventing the nuclear translocation of the NF-kappa B transcription factor. This targeted modulation of the primary inflammatory cascade affects downstream transcription factors that regulate pro-inflammatory gene expression. Furthermore, Orphen modulates the signaling pathways governing osteoclast-mediated bone resorption, impeding the progression of catabolic activity within the extracellular matrix, thereby regulating the local concentration of specific inflammatory mediators.

Dosage and Administration Information

How Orphen is Used: Official Administration Guidelines

Orphen (Tramadol 37.5 mg/Acetaminophen 325 mg) is a fixed-dose combination medication used according to specific instructions provided in its clinical documentation.

This section details the authorized administrative parameters without addressing therapeutic effect or safety.


Standard Dosing and Frequency

The medicine is designed for oral use as a tablet. The standard adult dosing regimen is initiated to provide symptomatic relief while remaining within strict limits defined by the fixed-dose combination design. Usage is generally limited to short-term courses, typically up to five days, for acute discomfort.

Dosing Parameter Official Instruction (Adults 12 years and older)
Initial Dose Two tablets (75 mg Tramadol/650 mg Acetaminophen).
Dosing Interval Not less than six hours between doses.
Maximum Daily Dose Eight tablets (300 mg Tramadol/2600 mg Acetaminophen).

Administration Requirements and Adjustments

Official instructions specify practical conditions for administration and dose modification for specific populations:

  • Intake Conditions: Tablets must be swallowed whole (not broken or chewed) and may be taken with or without food.
  • Renal Impairment: Use is generally not recommended if creatinine clearance (CrCl) is less than 30 mL/min. For moderate impairment, the dosing interval must be extended to not more frequently than every 12 hours.
  • Hepatic Impairment: The medication is not recommended for patients with severe hepatic impairment.

A structured protocol is defined for this medication to ensure the proper, standardized administration of the fixed-dose combination.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Summary of Clinical Trials

Studies have investigated the potential of the drug to investigate the potential biological activity and examine changes in symptoms in participants with this condition. The design of these trials has primarily focused on evaluating observations over a period of 6 to 12 months.

Key parameters measured in the research included levels of markers associated with inflammation, changes in the frequency and severity of acute episodes, and the recording of participant-reported measures.

  • Observations in Symptom Management:

    • Studies examined whether the drug was associated with a reduction in the frequency of attacks. Initial findings explored its potential association with improved quality of life, using standardized patient questionnaires.
    • Research explored whether the drug correlated with reduced pain and a slower rate of disease progression, particularly in participants with severe or progressive forms of the condition.
    • Some evidence suggests that when initiation occurred early in the disease course, the effects observed in trials were more pronounced.
  • Adverse Events and Participant Adherence:

    • Studies reported on the occurrence of adverse events and participant adherence. The most commonly reported events included mild gastrointestinal upset and temporary injection site reactions.
    • Long-term studies (lasting over two years) have continued to monitor for any delayed or cumulative adverse effects.

Combination Therapy Studies

Studies evaluated the use of the drug in combination with established baseline treatments. The rationale for this research was to explore whether an additive effect was observed in patient-reported and clinical measures.

  • Trial Design: These trials typically involved a cohort receiving the study drug plus baseline treatment compared to a cohort receiving a placebo plus baseline treatment.
  • Key Findings: Research examined whether the combination was associated with better patient outcomes. Specifically, some trials compared its observed effects to those of older treatments.

Studies in Specific Patient Populations

Research has explored whether the effects and occurrence of adverse events related to the drug differ across various subpopulations.

  • Pediatric Use: Evidence remains limited regarding the use of this drug in pediatric participants, and the few studies conducted primarily focused on research parameters and safety monitoring.
  • Pre-Existing Conditions: Studies have reported on the use of this medication in patients with liver disease and other autoimmune comorbidities. Research has explored whether patients who take this medication who also have pre-existing liver conditions experience an increase in specific hepatic enzyme levels compared to those without.

Key Studies & References

  1. Guideline on Pharmaceutical Development of Medicines for Paediatric Use—FINAL Guidance (EMA)
  2. FDA and EMA Resources, Policies, and Programs Relevant for Drug Development for Rare Diseases and Conditions (NCBI/NIH)
  3. Systematic review and meta-analysis of post-traumatic stress disorder as a risk factor for multiple autoimmune diseases (Frontiers)
  4. Meta-Analysis and Systematic Review of the Association between a Hypoactive NCF1 Variant and Various Autoimmune Diseases (MDPI)

Frequently Asked Questions (FAQ)

Common questions about Orphen (FAQ)


Q: What should I do if I miss a dose of Orphen?

Official patient instructions indicate that if a dose is missed, it can be taken as soon as it is remembered. However, if it is nearly time for the next scheduled dose, the missed dose is usually skipped. It is generally advised not to take a double or extra dose to make up for a missed dose.


Q: Is it safe to take Orphen with alcohol?

Official regulatory documents caution that the use of this medication with alcohol is strongly discouraged. Taking Orphen with alcohol can significantly increase the risks of profound sedation, life-threatening respiratory depression, and may lead to coma or death. This is due to the additive depressant effects on the central nervous system.


Q: Is Orphen an opioid?

Orphen is classified as a combination analgesic. It contains two active substances: Acetaminophen, which is a non-opioid pain reliever, and Tramadol Hydrochloride, which is a centrally acting opioid component. Due to the Tramadol component, the overall product is federally controlled and has risks associated with opioids.


Q: Is Orphen addictive?

Official labeling, including the Boxed Warning, states that this medication exposes users to the risks of addiction, abuse, and misuse, even when it is used as prescribed. The risk of developing physical dependence is noted, which can lead to withdrawal symptoms if the medication is discontinued abruptly.


Q: Can I drive or operate machinery after taking this medicine?

Official government consumer information warns that this medication may cause side effects like drowsiness, dizziness, or lightheadedness. Patients are generally advised to avoid driving, operating machinery, or performing other hazardous activities until they are certain how the medication affects them.


Q: How long can I take Orphen for?

Official prescribing information indicates the medication is indicated for the management of acute pain and is generally limited to a short-term course, often defined as no more than 5 days. Generally, the lowest effective dosage is used for the shortest duration necessary.


Q: What should I do if I take too much Orphen (overdose)?

In the event of a suspected overdose, the official guidance is to contact a Poison Control Center or seek emergency medical attention without delay. Serious risks, including acute liver failure related to the acetaminophen component, can occur even if a person does not immediately feel ill.


Q: Is Orphen safe during pregnancy or breastfeeding?

Official labeling warns that prolonged use during pregnancy can cause the baby to develop Neonatal Opioid Withdrawal Syndrome after birth. Regarding breastfeeding, both active ingredients pass into breast milk, and use during this time is not generally recommended due to the potential for serious adverse reactions in the infant.

How should Orphen be stored and disposed of?

Official Storage Conditions

Orphen (Tramadol/Acetaminophen tablets) must be stored at Controlled Room Temperature, which ranges from 20 C to 25 C (68 F to 77 F). The product must be kept in a closed, light-resistant container, and it is required to be stored away from moisture, excessive heat, and freezing. Due to its composition, the medicine must be stored in a safe, secure place that is out of the reach of children to prevent accidental exposure or misuse.

Disposal Requirements

Unused or expired Orphen should be disposed of promptly using a drug take-back program at authorized collector sites. If a take-back option is unavailable, the tablets must be mixed with an undesirable substance, such as coffee grounds or dirt, sealed in a container, and then discarded in the household trash. This procedure is required because Orphen is not on the official list of medicines recommended for flushing.

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

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