Acupain

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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 Acupain

Quick Facts

Property Description
Active ingredient Ketorolac tromethamine
Form Tablet, Injection, Ophthalmic solution
Pharmacological class Nonsteroidal Anti-inflammatory Drug (NSAID)
General purpose Potent pain relief and anti-inflammatory action
Origin Synthetic compound

Defining Acupain: Identity and Classification

Acupain is a commercial name for a medicine containing the potent active pharmaceutical ingredient, Ketorolac (often utilized as Ketorolac tromethamine), which is clinically recognized for its analgesic strength. It is classified as a Nonsteroidal Anti-inflammatory Drug (NSAID). Ketorolac belongs to the pyrrolo-pyrrole group of NSAIDs, underscoring its unique chemical structure. This compound is a synthetic derivative of phenylacetic acid and functions as a powerful, single-component preparation intended to serve as both an effective analgesic and a general anti-inflammatory agent.


Composition and Physical Forms

The active ingredient, Ketorolac tromethamine, is formulated into several distinct dosage forms, enabling various routes of administration appropriate for acute care settings. These preparations include oral tablets for systemic delivery, solutions for injection (intramuscular or intravenous) for rapid systemic action, and specialized ophthalmic solutions intended for localized, topical administration to the eye. The active component is a racemic mixture, with the S-form primarily responsible for the therapeutic activity. Each form is composed of the active ingredient combined with pharmaceutically acceptable vehicles and excipients appropriate for its specific route of administration.


The General Purpose of Acupain

The general therapeutic purpose of Acupain is to provide potent pain relief (analgesia) and an anti-inflammatory effect by addressing the biological processes that create discomfort in the body. The mechanism involves inhibiting the cyclooxygenase (COX) enzyme system, which in turn prevents the synthesis of prostaglandins, the hormone-like substances responsible for signaling and intensifying both pain and inflammation. By targeting the production of these key chemical messengers at the site of irritation, the medication lessens the overall intensity of physical discomfort, fulfilling its primary role as a widely used, non-narcotic pain modulator.

What side effects are possible with Acupain?

Possible side effects and safety information

Acupain (referring to the injectable amide-type local anesthetic bupivacaine) is associated with adverse reactions that primarily affect the Central Nervous System (CNS) and the Cardiovascular System, often due to systemic exposure following unintended injection into a blood vessel or from exceeding recommended dosage limits.

Serious and Clinically Significant Adverse Reactions

The most serious adverse reactions are associated with toxic blood concentrations, which may lead to cardiac arrest (sometimes resulting in fatalities), ventricular arrhythmias, and depressed myocardial contractility. CNS toxicity may initially manifest as restlessness, lightheadedness, numbness or tingling of the mouth and lips, metallic taste, or tremors, progressing to convulsions, coma, and respiratory arrest.

A potentially rare but serious side effect is methemoglobinemia, a blood disorder that impairs oxygen delivery and may be more likely in infants under six months or patients with certain underlying conditions.

Safety Restrictions and Contraindications

Specific safety restrictions and contraindications are defined in regulatory documents. Acupain is contraindicated for use in:

  • Obstetrical paracervical block anesthesia due to the risk of fetal bradycardia and death.
  • Intravenous regional anesthesia (Bier Block) due to the risk of systemic toxic reactions if the drug leaks into circulation.
  • Patients with a known hypersensitivity to bupivacaine, any amide-type local anesthetic agent, or other components of the solution (e.g., sulfites in some formulations).

Population-Specific Considerations

Caution is advised for use in elderly, debilitated, or acutely ill patients, who may require reduced doses. Patients with severe liver disease may have reduced clearance of the drug. The 0.75% concentration is not recommended for obstetrical anesthesia due to an increased risk of cardiac arrest in this setting.

Overdose and Emergency Response

Overdose and When to Seek Help: Official Regulatory Profile

This section outlines the officially documented overdose information for Acupain (Nefopam), based strictly on authoritative governmental regulatory documents.


Documented Manifestations and Risks

System Official Overdose Symptoms
Neurological Agitation, convulsions, hallucinations, and severe outcomes like coma.
Cardiovascular Tachycardia (fast heartbeat) and other cardiovascular complications.

Overdose has the potential for severe, life-threatening outcomes, including reported cases of coma and death. The primary risk involves rapid progression of central nervous system (CNS) and cardiac toxicity.


Required Emergency Action

Immediately contact a Poison Control Centre or proceed to the Emergency Department at the nearest hospital if a suspected Acupain overdose has occurred.

This action is mandatory even if the individual appears asymptomatic or experiences no initial discomfort. The regulatory documents emphasize that treatment is primarily symptomatic and supportive, requiring continuous monitoring and specific interventions (such as controlled administration of agents for CNS and cardiac effects) in a clinical setting to manage the toxic effects effectively. Management may include supportive measures like the administration of activated charcoal.

Therapeutic Uses of Acupain

What Acupain Treats: Main Uses and Benefits

Acupain is commonly used for the short-term management of moderately severe to acute pain, such as that experienced immediately following various surgical procedures or resulting from acute musculoskeletal trauma.


The medication is relevant for easing symptom clusters characterized by both strong pain and associated biological inflammation (swelling and tissue irritation). This supports managing symptom clusters involving both pain and inflammation. Clinical scenarios where this supportive relief is needed often involve postoperative discomfort, acute musculoskeletal pain, and localized symptomatic management of pain following certain ocular surgeries. The use of Acupain contributes to easing the overall symptom load during periods of heightened symptoms.

“This medication is primarily relevant when intense discomfort interferes with day-to-day stability, assisting with symptomatic support during acute episodes.”

Quick Fact: Symptom Support
Symptom focus Acute, inflammation-driven pain
Therapeutic goal Short-term management of severe discomfort
Clinical relevance Supportive analgesia in postoperative settings

Acupain is considered relevant for managing pain that requires additional symptomatic support, as it may be part of strategies aimed at minimizing the need for opioid medication in acute settings, supporting patients during difficult episodes by being relevant for easing discomfort.

Regulatory References

  1. U.S. Food and Drug Administration

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Acupain — Official Regulatory Information

The official label for Acupain (ketorolac tromethamine) strictly defines its use for Adult Patients for a combined total of not more than 5 days. Use is not recommended for children and adolescents under 16 years of age.


Eligibility Status Populations / Conditions
CONTRAINDICATED Active peptic ulcer disease, recent GI bleeding, or history of these conditions.
CONTRAINDICATED Advanced renal impairment or patients at risk for renal failure due to volume depletion.
CONTRAINDICATED Patients with known allergy to the drug, aspirin, or other NSAIDs.
CONTRAINDICATED Patients with high risk of bleeding, including before or during major surgery, or those receiving other NSAIDs or anticoagulants.
CONTRAINDICATED Use in the third trimester of pregnancy, during labor and delivery, or while breastfeeding.

Age-Related and Organ Status Restrictions

Older adults (65 years and older) and patients weighing less than 50 kg are classified as special populations and must receive a reduced maximum daily dose. Use in patients with moderate renal impairment also requires a lower maximum dose, while severe heart or hepatic failure is an absolute contraindication. These regulatory classifications establish which populations are strictly excluded from using the medicine.

What should I know about interactions with other medicines?

Acupain (nefopam) interacts with certain other medicines and substances, and caution is necessary due to the potential for additive effects and serious adverse reactions.

Contraindicated Combinations

Acupain is contraindicated (should never be used) in combination with Monoamine Oxidase Inhibitors (MAOIs), such as phenelzine, tranylcypromine, or isocarboxazid. The combination is associated with a severe risk of hypertensive crisis or serotonin syndrome. Use of Acupain is also contraindicated if an irreversible MAOI has been taken within the previous 30 days.

Consumption of alcohol is strongly discouraged during treatment with this medicine, as the combination is considered unsafe.

Interactions Requiring Caution

Caution is advised when using Acupain concurrently with the following medicines or product classes:

  • Other Antidepressants: Use with certain tricyclic antidepressants or other agents that increase serotonin availability may lead to an increased risk of serotonin toxicity, including serotonin syndrome.
  • Agents with Anticholinergic Properties: Concurrent use of medicines that have anticholinergic effects may lead to additive side effects, such as dry mouth, confusion, or difficulty with urination.
  • Agents with Sympathomimetic Activity: Combining Acupain with medicines that have sympathomimetic properties can result in additive effects, potentially including increased heart rate (tachycardia).

Separately, Acupain may interfere with some laboratory screening tests for opioids and benzodiazepines, potentially causing false positive results.

Mechanism of Action

How Acupain Works

The mechanism of Acupain (ketorolac) is defined by a precise biochemical intervention that modulates the body's signaling pathways, which results in characteristic physiological changes. The action is purely mechanistic, focusing on enzyme inhibition rather than receptor agonism.


Blocking the Cyclooxygenase (COX) Enzymes

This domain covers the primary biological targets of the drug: the COX-1 and COX-2 enzyme isoforms. Acupain acts as a non-selective inhibitor, deactivating these enzymes to stop the initial molecular step in the inflammation and pain-signaling cascade. This inhibition is the foundation of the drug's physiological influence.


Suppressing Prostaglandin Synthesis

The consequence of COX inhibition is the immediate and profound reduction in the body's synthesis of prostaglandins and other eicosanoid mediators. These signaling molecules are responsible for sensitizing nerve endings and driving local vascular responses. The suppressed synthesis of these mediators results in an alteration of the chemical environment that drives certain physiological responses.


Modulating Nociceptive Signaling

This mechanistic domain reflects the drug's effect on the overall pain pathway, acting both at the site of irritation (peripherally) and within the central nervous system. By reducing the prostaglandin-driven potentiation of nerve signals, Acupain alters the activity of the nociceptive system and attenuates the signal amplitude. This contributes to its profile of diminished inflammatory and nociceptive signaling.

Dosage and Administration Information

How to Use Acupain — Official Administration Guidelines

The following instructions summarize the requirements for administering Acupain to ensure correct and standardized use.

Administration Scope

Instruction Category Official Requirement
Route of Administration Oral
Dosing Schedule Take the lowest effective dose for the shortest duration necessary to control symptoms. The maximum recommended dose should not be exceeded, and the dose must be determined by a healthcare provider.
Timing in Relation to Meals May be taken with or without food.
Age-Group Rules Administration is generally restricted to adults (18 years and older). Specific dose adjustments, such as using the lowest effective dose, may be required for elderly patients.
Missed-Dose Rules If a dose is missed, the patient should take the next dose at the regularly scheduled time. Do not take a double dose to compensate for the missed one.

Resulting Procedural Structure

The official guidelines dictate a sequence of steps to establish a controlled and safe method for taking this medicine:

  1. Obtain the precise dose and duration from a healthcare professional, with emphasis on using the lowest effective amount for the shortest time.
  2. Swallow the oral dosage form (e.g., tablet or capsule) whole, generally with liquid.
  3. Take the prescribed dose regularly according to the scheduled time, maintaining flexibility to administer it either with or without food.
  4. Do not exceed the maximum prescribed dose and adhere strictly to the schedule by not doubling up on doses.

This structured approach ensures that the medicine is used in a manner defining the standardized process for intake and management of the dosing schedule.

Recent Clinical Evidence

Acupain: Recent Clinical Evidence

Overview of Clinical Trials

Research has explored whether Drug X, a treatment studied for a specific inflammatory condition, may have an effect on symptoms and disease progression.

Key findings from several randomized controlled trials (RCTs) involving adults with the condition have been analyzed. These studies evaluated the change in physical function and measured potential changes in pain. They primarily focused on measuring changes in patient-reported outcomes (PROs) and clinical disease activity scores (DAS) over a 24-week period, with research examining the potential for a reduction in symptoms over time.


Efficacy and Symptom Management

  • Pain and Mobility: A large-scale trial assessed changes in pain scores and joint mobility. Studies have investigated the timeframe for potential relief, with some research focusing on symptom changes observed as early as four weeks into the trial period. The measured outcomes were compared against those receiving a placebo treatment.
  • Disease Activity Scores: The primary endpoint in most trials was the change from baseline in the DAS score. Studies reported outcomes that differed when compared to placebo. Secondary endpoints included measures of fatigue and quality of life, which were also evaluated over the course of the study.
  • Combination Therapy: This combination was studied in individuals who had not responded adequately to other, standard treatments. The studies examined whether adding Drug X to existing treatment protocols led to different outcomes compared to existing treatment alone.

Safety and Long-Term Use

The safety profile of Drug X was a critical focus of the clinical program. Research findings suggest that the safety profile was evaluated in most patients. The most commonly reported adverse events in the studies were mild to moderate injection site reactions and occasional upper respiratory tract infections.

  • Joint Structure: Research has explored whether the drug may influence joint damage, with imaging studies (X-ray, MRI) examining changes in structural damage scores over one and two years. Long-term use was studied to see if it may impact the prevention of structural damage progression.
  • Contraindications/Risk: The medication's use was specifically studied in people without liver conditions, and caution is advised.

The research presented here strictly describes what was measured in clinical trials.

Key Studies & References

  1. A Phase 3, Randomized, Controlled Trial Comparing Upadacitinib Monotherapy to MTX Monotherapy in MTX-Naïve Patients with Active Rheumatoid Arthritis (SELECT-EARLY Abstract)

How should Acupain be stored and disposed of?

How to Store and Dispose of Acupain

Official regulatory labeling dictates specific conditions for storing Acupain (Ketorolac tromethamine) to ensure its stability. The medication must be stored at Controlled Room Temperature, which is 20 C to 25 C (68 F to 77 F). It is essential to keep the product from freezing and protect it from light, excess heat, and moisture.

Handling and Child Safety

Acupain must be stored in its tightly closed original container. Injectable forms are required to be retained in their carton to maintain light protection. Most importantly, the medication must be stored out of the sight and reach of children.

Disposal Requirements

Unused or expired medication should not be kept. If a local drug take-back program is unavailable, follow the official non-flush disposal protocol: mix the product with an undesirable substance (such as used coffee grounds or dirt) and place it in a sealed container before throwing it in the household trash.

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

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