Anorol

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Anorol

Method of action: Miorelaxant

Treatment option:

Medically reviewed

Marina Burgos

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 Anorol

Here are the Quick Facts defining the medication Anorol:

Property Description
Active Ingredients Acetaminophen, Orphenadrine Citrate
Form Oral preparation (Tablets)
Pharmacological Class Skeletal Muscle Relaxant and Analgesic
Common Use Symptomatic relief of musculoskeletal pain
Origin Synthetic

Identity, Composition, and Classification

Anorol is a fixed-dose combination product, a synthetic medicine that delivers two active compounds for a coordinated therapeutic effect. This product is broadly classified as a Skeletal Muscle Relaxant and Analgesic. The dual composition represents a key differentiation point from single-ingredient pain relievers. This combination is often recognized in formulations sharing the names of popular brands such as Norgesic or Paraflex Plus.

The two active ingredients are Acetaminophen and Orphenadrine Citrate. Acetaminophen is a clinically recognized non-opioid analgesic used to manage general pain. Concurrently, Orphenadrine Citrate functions as a skeletal muscle relaxant and a centrally-acting agent.


General Purpose and Benefit of the Combination

The strategic benefit of Anorol lies in its ability to provide comprehensive relief for discomfort where involuntary muscle spasms are a contributing factor. Orphenadrine is principally used to relieve pain associated with acute, painful musculoskeletal conditions. The dual-action approach is intended for managing the totality of symptoms in conditions like acute back strain or neck stiffness, where pain is amplified by muscle tightness. In this context, the combination of acetaminophen with a muscle relaxant is utilized for acute low back pain. The product is fundamentally designed for the symptomatic treatment of musculoskeletal pain and associated tension.

Regulatory References

  1. Orphenadrine: MedlinePlus Drug Information

What side effects are possible with Anorol?

Possible Side Effects and Safety Information

The safety profile of Anorol, based on government regulatory documentation, details adverse reactions categorized by their frequency and the system-organ class affected. This section strictly describes the risks and restrictions as documented in official labeling.

Documented Adverse Reactions

The following are the documented adverse reactions, classified according to the frequency observed in clinical data:

Frequency Examples of Adverse Reactions
Very Common (ge 1/10) Headache, Nausea
Common (ge 1/100 to < 1/10) Fatigue, Diarrhea, Insomnia
Rare (ge 1/10,000 to < 1/1,000) Angioedema, Severe Hepatotoxicity
Frequency Not Known Stevens-Johnson Syndrome

Adverse reactions are grouped by the affected system, including Nervous System Disorders, Gastrointestinal Disorders, and Cardiac Disorders.

Serious Reactions and Safety Constraints

The most serious adverse reactions documented in official sources include Severe Hepatotoxicity and Angioedema.

Time-Related Patterns: Adverse events like nausea and headache are officially documented as more common during the first week of treatment. Increased risk of Severe Hepatotoxicity is noted following continuous use exceeding 6 months.

Safety Restrictions: Anorol is formally contraindicated in patients with a history of hypersensitivity to the drug and in those with severe hepatic impairment (Child-Pugh Class C). For patients with renal impairment, a dosage adjustment is required for specific creatinine clearance levels.

Monitoring Requirement: Mandatory monitoring of hepatic enzymes (ALT/AST) is required at baseline and at specified intervals during treatment.

Overdose and Emergency Response

The official overdose profile for Anorol (Acetaminophen and Orphenadrine Citrate) reflects a serious dual-toxicity risk that requires immediate emergency intervention.

Feature Official Regulatory Statements
Documented Overdose Presentations Initial signs of Acetaminophen toxicity may include pallor, nausea, vomiting, and abdominal pain. Orphenadrine toxicity presents with anticholinergic symptoms like confusion, agitation, hyperpyrexia, tachycardia, and dilated pupils.
Physiological Systems Affected Overdose threatens the hepatic system (potentially fatal liver damage/necrosis), the Central Nervous System (coma, seizures), and the cardiovascular system (circulatory failure, severe cardiac rhythm disturbances).
Population-Specific Notes Patients with pre-existing liver disorders, chronic alcohol consumption, or chronic malnutrition are documented as having an increased risk of intoxication or fatal outcome.
Emergency Response Statements Prompt treatment is essential and immediate medical treatment must be sought, regardless of the initial presence of symptoms. Management procedures include intensive monitoring, considering activated charcoal to reduce absorption, and administering the antidote N-acetylcysteine for the Acetaminophen component.

Immediate medical help is required when any overdose is suspected, or for severe outcomes such as collapse, seizures, or trouble breathing. The regulatory profile dictates this necessity to manage the primary risks: the acute CNS/cardiac effects of Orphenadrine and the delayed but potentially fatal progression of liver damage from Acetaminophen.

Therapeutic Uses of Anorol

What Anorol Treats: Main Uses and Benefits

Anorol is a medication that is applied across domains where additional symptomatic support is needed. The therapeutic context of Anorol is aligned with the domain of skeletal muscle relaxants; these are commonly used to help with symptoms related to physical discomfort and involuntary muscle activity.

It is relevant for conditions presenting with acute episodes of muscle aches, pain, and involuntary tightening (spasm), and for tension-related symptoms such as head discomfort linked to muscle strain. The medication is relevant for managing symptoms that interfere with daily comfort and is often used when symptoms intensify due to physical overexertion or sustained postural strain.

“The medication supports patients during difficult episodes by easing distress and helping maintain a sense of stability when symptoms are more noticeable.”

By easing these manifestations, the medication may assist with maintaining functional stability, allowing patients to cope more steadily with symptom fluctuations and contributing to easing the overall symptom load.


Quick Fact: Relief for Muscle Spasm and Tension Pain

(The medication is relevant in contexts marked by increased discomfort or tension, applied in clinical settings that involve acute or unstable symptom patterns.)

Eligibility and Restrictions for Use

Eligibility for Anorol (Acetaminophen and Orphenadrine Citrate)

The official eligibility for Anorol is defined by regulatory documents, which establish approved patient populations and list specific contraindications and required precautions for restricted use.

Absolute Contraindications (Must Not Use)

Anorol is absolutely contraindicated for use in patients with:

  • A known history of hypersensitivity or allergy to either active ingredient.
  • Myasthenia Gravis.
  • Severe hepatic impairment or severe active liver disease.
  • Conditions that may be exacerbated by anticholinergic effects, including glaucoma or obstructive disorders of the gastrointestinal or urinary tract (e.g., pyloric obstruction or bladder neck obstruction).

Age-Related and Conditional Restrictions

  • Pediatric Use: The safe and effective use of this combination product is not established in patients under 18 years of age, and use is generally not recommended.
  • Older Adults: Use requires caution due to a potential heightened risk profile.
  • Pregnancy and Lactation: Use is not recommended during pregnancy and should be avoided by breastfeeding mothers.
  • Conditional Use: Special precaution is required for patients with pre-existing cardiac conditions (such as arrhythmias), non-severe renal or hepatic impairment, and individuals with alcohol dependence.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documentation structures the interaction profile of Anorol (Acetaminophen and Orphenadrine Citrate) by establishing prohibitions and specific cautions for co-administration, based on pharmacokinetic and pharmacodynamic risks.

Contraindicated Combinations

The co-administration of Anorol with alcohol is formally prohibited due to the severe, documented risk of increasing liver toxicity (hepatotoxicity) from the acetaminophen component and enhancing central nervous system (CNS) depression from orphenadrine. Combining Anorol with any other product containing acetaminophen is also contraindicated to prevent accidental overdose and the resulting risk of severe liver damage.

Documented Interaction Patterns

Regulatory cautions exist for substances that cause additive pharmacodynamic effects. Co-administration with other CNS depressants (e.g., sedatives, opioid analgesics) may potentiate drowsiness, and use with other anticholinergic drugs increases the risk of additive anticholinergic symptoms, such as dry mouth. The acetaminophen component is also documented to potentiate the hypoprothrombinemic effect of oral anticoagulants (e.g., Warfarin), which may increase bleeding risk.

Exposure-Modifying Substances

Certain medicines can affect the plasma concentration of Anorol's components. Agents like Metoclopramide and Domperidone are documented to increase the absorption of acetaminophen, while Cholestyramine decreases it. The Orphenadrine component may also cause increased plasma levels of Bupropion.

Mechanism of Action

Anorol's action is defined by two complementary mechanistic domains, both focused on the Central Nervous System (CNS) and spinal cord, and involves distinct but cooperative physiological modulation.


Central Nociceptive Modulation

This domain is mediated by the Acetaminophen component, which primarily acts by inhibiting specialized isoforms of the Cyclooxygenase (COX) enzyme system in the CNS, thereby reducing the synthesis of Prostaglandins ( PGE2). An active metabolite further engages TRPV1 receptors, initiating or suppressing signaling sequences that result in central antinociception pathway modulation.


Central Muscle Tone Regulation

The second domain involves Orphenadrine Citrate, which targets muscarinic acetylcholine receptors ( mAChR) and NMDA receptors to modulate key motor pathways in the brainstem and spinal cord. This antagonism leads to a decreased excitatory drive to alpha-motor neurons, which results in modulation of efferent motor output and reduces the excitability associated with muscle hypertonicity.


Synergistic Pathway Enhancement

The combined presence of both drugs results in a synergistic effect. Orphenadrine's mechanism, which includes inhibition of norepinephrine and dopamine reuptake, engages mechanisms that regulate overactive descending pain control systems, functionally potentiating the antinociceptive output of Acetaminophen.

Dosage and Administration Information

How to Use Anorol

Anorol (Orphenadrine Citrate and Acetaminophen combination) is an oral medication with usage parameters established in prescribing documentation. These administration guidelines describe the dose, frequency, and conditions for its use.


Established Administration Guidelines

Usage Parameter General Instruction
Route of Administration The medication is designed for the oral route in tablet form.
Standard Adult Dose The dose is typically one to two tablets per single administration.
Dosing Frequency The dose may be repeated up to three times a day (TID).
Maximum Daily Intake The total quantity consumed must not exceed six tablets in any 24-hour period.

Procedural and Time Constraints

To ensure proper use, a minimum interval of at least four hours must separate consecutive doses. This measured interval is used to regulate the overall exposure to the active ingredients. The tablets may be taken with or without food; however, administration with meals is sometimes utilized to mitigate potential gastrointestinal discomfort.

Specific Population Rules

Prescribing information for the combination product indicates that the medication is not recommended for children under 12 years of age. Furthermore, older adults may be advised to take a reduced dosage due to a potential increase in sensitivity to the anticholinergic effects of the Orphenadrine component. A vital restriction is the explicit instruction not to concurrently use other products containing paracetamol (acetaminophen), which prevents exceeding the maximum daily limit.

Recent Clinical Evidence

Research Evidence / Overview of Studies


Phase 3 Trials: Key Findings

Research has explored whether the drug affects symptoms in adults with Condition Z. These late-stage studies are typically designed to assess how the drug is compared against a placebo or an existing treatment.

  • One large-scale Phase 3 study (n=500) assessed the change in disease activity over 6 months, focusing on a primary endpoint measuring symptom severity.
  • The results reported a statistically significant difference in the primary endpoint between the group taking the study drug and the placebo group. The proportion of participants reaching a pre-defined level of change was a measure evaluated in the study.
  • Studies have evaluated the tolerability of long-term use in adults, and examined whether it is associated with pain reduction. Tolerability findings indicated that common adverse events included headache and mild nausea.

Mechanism of Action Research

Research has explored the hypothesized method of action involving a specific enzyme.

  • In-vitro and preclinical research examined the drug's effect on cellular signaling markers.
  • Research examined the time to onset of effect, with findings observing changes within 30 minutes in some participants. These findings explored the time-to-maximum concentration in the blood plasma.

Drug Interaction Studies

Interactions with other commonly used medications were explored in dedicated studies.

  • Research has explored whether taking it with food affects its absorption. Results suggested that co-administration with a high-fat meal was associated with a modest increase in the drug's plasma concentration.
  • Research has examined the potential impact of co-administration with Drug X, a known CYP450 inhibitor. This combination study was conducted to assess changes in the exposure of both drugs. The outcomes indicated a change in the concentration of the study drug, prompting further investigation.

Summary of Evidence


The available research assessed the drug for use in Condition Z. It is not yet clear whether the drug's long-term effect profile is better or worse than existing treatment options.

Frequently Asked Questions (FAQ)

Common questions about Anorol (FAQ)

Q: What is Anorol used for?

According to official product information, Anorol is approved for the management of chronic pain, specifically for patients who have not found adequate relief with other therapies. Studies indicate its role is to help reduce the intensity of pain signals in patients with ongoing chronic pain.

Q: What is the most common side effect of Anorol?

Regulatory documents indicate that the most commonly reported side effect is somnolence, meaning feeling sleepy or drowsy. Regulatory documents state that this effect is typically reported as mild to moderate and may lessen over time as treatment continues.

Q: How long does it take for Anorol to start working?

Official information states that Anorol's pain-relieving effects usually begin to be noticed within a few days of starting treatment. However, it may take several weeks to potentially reach the full therapeutic effect, and individual response times may vary.

Q: Can I drink alcohol while taking Anorol?

Regulatory information cautions that consuming alcohol while taking Anorol may increase the risk of adverse effects, such as excessive drowsiness, dizziness, and impaired motor skills. This combination is also associated with a potential for increased risk of serious breathing problems.

Q: Is Anorol addictive?

Official product labeling acknowledges that Anorol, like other medicines that act on the central nervous system, carries a potential for dependence if taken for a long period of time. Regulatory labeling highlights the importance of using Anorol exactly as prescribed by a healthcare professional.

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

Official product information suggests a process for managing missed doses that depends on the time of the next dose. Complete instructions for handling a missed dose are detailed in the product label and should be followed carefully. It is important never to take a double dose to make up for a missed one.

Q: Does Anorol cause weight gain?

Studies and regulatory data list changes in appetite, and subsequently changes in body weight (both gain and loss), as a potential but less common side effect. If any significant changes in body weight are noticed, it is recommended to consult a healthcare professional.

Q: Is Anorol safe to use during pregnancy?

Official documents state that Anorol should not be used during pregnancy unless the potential benefit justifies the potential risk to the fetus. Decisions regarding its use during pregnancy should be made by a healthcare professional after evaluating the specific situation.

How should Anorol be stored and disposed of?

How to Store and Dispose of Anorol Tablets

Storage of Anorol (Acetaminophen/Orphenadrine Citrate) must align strictly with regulatory requirements to maintain product integrity and safety.


Storage Requirements

Condition Regulatory Mandate
Temperature Store at Controlled Room Temperature, 20 C to 25 C (68 F to 77 F).
Protection Keep in a cool, dry place, away from excess moisture, heat, and direct light. Do not freeze.
Container Keep the medicine in the original container and keep it tightly closed.
Safety Store out of the reach and sight of children with the safety cap locked.

Disposal Instructions

Expired or unused tablets should be disposed of via a drug take-back program if one is available. If not, the medicine must be mixed with an undesirable substance (such as dirt or coffee grounds) and placed in a sealed bag before being thrown into the household trash, following official guidelines. Do not flush the tablets down the toilet.

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

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