Arcosal

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Arcosal

Method of action: Hypoglycemic

Treatment option: Diabetes Mellitus

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 Arcosal

What is Arcosal?

Arcosal is a medication classified as a non-steroidal anti-inflammatory drug (NSAID), specifically belonging to a sub-group known as selective COX-2 inhibitors. Unlike traditional NSAIDs that inhibit both COX-1 and COX-2 enzymes, Arcosal is designed to primarily target the COX-2 enzyme, which is responsible for producing the prostaglandins that cause pain and inflammation in the body.

Therapeutic Use

Arcosal is used to manage symptoms associated with various inflammatory joint conditions. By reducing the production of inflammatory mediators, it helps to alleviate the physical discomfort and swelling often found in chronic conditions. It is commonly utilized for the following indications:

  • Osteoarthritis: A degenerative joint disease characterized by the breakdown of joint cartilage.
  • Rheumatoid Arthritis: A chronic inflammatory disorder affecting the lining of the joints.
  • Ankylosing Spondylitis: A type of arthritis that primarily affects the spine, leading to stiffness and inflammation.
  • Gouty Arthritis: Acute attacks of joint pain and inflammation caused by the accumulation of uric acid crystals.

Mechanism of Action

The active ingredient in Arcosal works by blocking the cyclooxygenase-2 (COX-2) enzyme. In a healthy state, this enzyme is typically present in low levels, but it increases significantly in response to injury or disease. By inhibiting this specific enzyme, Arcosal reduces the synthesis of prostaglandins at the site of inflammation, thereby decreasing pain signals and physical swelling without significantly affecting the COX-1 enzymes that help protect the stomach lining.

Regulatory References

  1. MedlinePlus Drug Information

What side effects are possible with Arcosal?

The safety profile of Arcosal (Tolbutamide), a first-generation sulfonylurea, is structured according to adverse reactions and warnings documented in government-approved labeling.

Adverse Reaction Scope

The primary and most expected adverse metabolic event is hypoglycemia (low blood sugar), which can range from mild to severe and is classified under Metabolism and Nutrition Disorders. Less severe but more common effects are typically related to Gastrointestinal Disorders, including nausea, heartburn, and upper abdominal fullness. Other documented System-Organ Classes involved include Skin and Subcutaneous Tissue Disorders (e.g., rash, photosensitivity) and rare effects on the Blood and Lymphatic System.

Serious Adverse Reactions and Safety Constraints

Official labeling for the sulfonylurea class includes a documented warning regarding an historical finding of increased cardiovascular mortality compared to diet alone. Other serious adverse reactions listed in regulatory documents include the risk of severe hypoglycemia (potentially leading to neurological damage) and rare but documented conditions such as aplastic anemia and cholestatic jaundice.

Safety notes address specific patient populations. Older adults are particularly susceptible to the hypoglycemic action, and patients with severe renal or hepatic impairment face an increased risk of severe low blood sugar. The medicine is officially contraindicated in conditions such as diabetic ketoacidosis, Type 1 diabetes mellitus, and in individuals with a known hypersensitivity to the drug or other sulfonylureas. Additionally, patients with G6PD deficiency may be at risk of hemolytic anemia with this class of drug.

Overdose and Emergency Response

The official regulatory profile for Arcosal (Tolbutamide) overdose centers entirely on the risk of severe hypoglycemia (dangerously low blood glucose), which is classified as a life-threatening medical emergency. Overdose presentations are characterized by symptoms such as confusion, extreme weakness, diaphoresis (sweating), tachycardia (fast heartbeats), tremors, and slurred speech.

If overdose is suspected, immediate medical attention must be sought. Urgent care is required when the severe manifestations occur, including seizures, convulsions, or loss of consciousness. The regulatory-defined management involves general supportive measures and the administration of Intravenous dextrose to restore blood glucose levels.

A critical requirement is the mandatory period of close monitoring for a minimum of 24 to 48 hours in a hospital setting. This prolonged observation addresses the documented risk that hypoglycemic episodes may recur and last for several days after initial treatment. Regulatory information also specifies that populations such as the elderly and patients with hepatic or renal impairment face an increased risk of severe and prolonged overdose effects. Furthermore, official guidance states that Glucagon is generally not recommended as an antidote for Tolbutamide overdose.

Therapeutic Uses of Arcosal

What Arcosal Treats: Main Uses and Benefits

Arcosal is commonly used for managing Type 2 diabetes mellitus in adults, specifically addressing the symptoms related to systemic imbalance of chronic hyperglycemia. This medication is used in combination with diet and exercise to help improve blood sugar control. It is considered relevant for patients whose bodies still produce some insulin but struggle to maintain glucose stability, a common issue in this patient group.


Key Therapeutic Focus

The primary therapeutic domain of Arcosal is the long-term management of Type 2 diabetes. The medication helps manage symptoms related to systemic imbalance that arise from persistently elevated blood glucose. It is applied when patients face conditions where supportive symptom management is appropriate to help manage the potential for increased systemic burden, particularly when blood sugar is not adequately controlled by non-pharmacological efforts. The therapeutic domain encompasses symptoms related to systemic imbalance, fluctuating manifestations of blood glucose, and conditions associated with adult-onset diabetes.

Quick Fact: Relief for Persistent High Blood Sugar

This medication may help contribute to the stabilization of blood glucose levels, supporting the patient during difficult episodes by easing distress and contributing to improved day-to-day comfort. Achieving stability is often regarded as the primary goal in supporting long-term health for Type 2 diabetes. Sustained control may assist with managing the potential for severe, long-term symptoms linked to organ-specific functional stress.

Regulatory References

  1. MedlinePlus Drug Information overview on Tolbutamide

Eligibility and Restrictions for Use

Who Can and Cannot Use Arcosal (Tolbutamide)

Eligibility for Arcosal is strictly defined by regulatory authorities and is determined by patient age, specific clinical conditions, and physiological status.


Contraindicated and Restricted Populations

Classification Population / Condition
Absolutely Contraindicated Type 1 Diabetes Mellitus or Diabetic Ketoacidosis
Hypersensitivity to Tolbutamide or other Sulfonylureas
Severe Renal or Severe Hepatic Impairment
Pregnancy or Breastfeeding
Conditional Use (Caution) Elderly/Geriatric Patients (due to hypoglycemia susceptibility)
Patients with Adrenal or Pituitary Insufficiency
Patients with G6PD Deficiency (alternative suggested)
Not Recommended Pediatric Population (safety/efficacy not established)

Summary of Regulatory Eligibility

Arcosal is indicated only for adults with Type 2 Diabetes Mellitus whose blood glucose control is insufficient with diet and exercise alone. Use is prohibited during periods of acute stress (such as infection or trauma), which necessitates temporary insulin therapy. These rules define the permissible user groups while establishing non-negotiable exclusions to minimize risks associated with the sulfonylurea class.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The regulatory profile for Arcosal (Tolbutamide) identifies specific drug-drug and drug-substance interaction patterns.

Interaction scope

Property Description
Medicinal product categories with documented interactions: Non-steroidal anti-inflammatory agents (NSAIDs), Salicylates, Sulfonamides, Coumarin derivatives, Monoamine oxidase inhibitors (MAOIs), Beta-adrenergic blocking agents, Thiazides and other Diuretics, Corticosteroids, Oral contraceptives.
Specific interacting medicines (if explicitly listed): Sulfafurazole, Coumarins (as contraindicated), Chloramphenicol, Cimetidine, Probenecid, Rifampicin.
Mechanistic basis of interactions (only if stated in label): Classified as a Sensitive Index Substrate for Cytochrome P450 2C9 (CYP2C9); documented potentiation via displacement from protein binding sites.
Interaction-related restrictions: Alcohol (Ethanol) must be avoided due to the risk of a disulfiram-like reaction and/or prolonged hypoglycemic effect.

Interaction classifications (high-level)

Property Description
Interaction severity classification (as defined in official documents): Includes Contraindicated Combinations and substances causing Potentiation or Antagonism of the blood sugar-lowering effect.

Resulting interaction structure

Official interaction statements:

  • Co-administration with Sulfafurazole and Coumarins is formally prohibited (contraindicated) due to the documented risk of severe hypoglycaemic reactions.
  • Agents that potentiate the hypoglycemic action include Non-steroidal anti-inflammatory agents (NSAIDs), Salicylates, MAOIs, and Beta-adrenergic blocking agents.
  • The hypoglycemic effect may be diminished by agents that tend to produce hyperglycemia, including Thiazides and other diuretics, Corticosteroids, Oral contraceptives, and Phenytoin.
  • The medicine is classified as a sensitive index CYP2C9 substrate; co-administration with inhibitors such as Chloramphenicol may decrease its metabolism, while Rifampicin may increase its clearance.
  • Alcohol ingestion must be avoided due to the formal documentation of an adverse reaction, described as a disulfiram-like reaction, and an increased risk of prolonged hypoglycemia.

Connection to the overall interaction profile: Regulatory documents define the product’s interaction structure primarily through strict prohibitions on certain co-administrations and formal classifications of agents that either potentiate or antagonize the medicine's effect. This profile is supported by the explicit labeling of Tolbutamide as a CYP2C9 substrate, which accounts for the listed drug interactions that alter its metabolic clearance and resulting exposure.

Mechanism of Action

Arcosal, chemically cromoglicic acid, functions as a mast cell stabilizer, primarily accumulating within mucosal tissues. Its biological targets involve the cellular mechanisms governing mast cell degranulation. The compound mechanically inhibits the influx of calcium ions (Ca^2+) across the mast cell membrane. This specific blockade of the calcium channel, likely mediated via regulation of the heat shock protein HSP 90-alpha, prevents the immediate, rapid increase in intracellular Ca^2+ concentration necessary for triggering the exocytotic process. By stabilizing the mast cell membrane and disrupting the Ca^2+-dependent signaling cascade, Arcosal suppresses the release of preformed and newly synthesized inflammatory mediators, including histamine and specific leukotrienes. The resulting downstream cascade is a systemic reduction in mediator-driven inflammatory signaling and tissue response.

Dosage and Administration Information

How to Use Arcosal

Arcosal, which contains the active ingredient Tolbutamide, is an oral tablet administered based on structured guidelines. The medication is always taken by the oral route and should be consumed either with or immediately after a main meal to align with its pharmacological action.

Official Dosing and Administration

Instruction Detail
Route of Administration Oral (by mouth)
Usual Starting Dose 1 gram (1000 mg) to 2 grams (2000 mg) daily
Maximum Daily Dose 3 grams (3000 mg) per day
Dosing Frequency The total daily dose may be taken once daily in the morning or in divided doses throughout the day

Usage Protocol and Adjustments

Treatment begins with the starting dose, and the amount is gradually adjusted based on blood glucose response. The daily dose may be increased or decreased over time to find the lowest effective maintenance dose, which typically falls in the range of 0.25 g to 3 g daily, although doses above 2 g are rarely necessary.

Population-Specific Dosing: Official instructions require a conservative approach to both initial and maintenance dosing for specific patient groups. This cautious dosing strategy applies explicitly to older adults and individuals with impaired hepatic or renal function.

If a dose is missed, it is generally advised not to take a double dose to compensate, but to continue with the next scheduled dose, maintaining the regular frequency.

Recent Clinical Evidence

Arcosal: Recent Clinical Evidence

Core Mechanism and General Efficacy Research

The compound is understood to operate by potentially inhibiting the COX-2 enzyme, a key element in the production of pro-inflammatory prostaglandins. Research has investigated its use across both acute and chronic pain conditions, with studies assessing effects on patient quality of life.

  • Acute Pain Studies: Initial studies evaluated whether single-dose administration may influence post-operative dental and orthopedic pain. Studies reported that findings suggested a potential for short-term change when compared to placebo in some of these acute settings.
  • Chronic Pain Studies: Studies have explored its potential to influence pain associated with conditions like osteoarthritis and rheumatoid arthritis. This research included evaluation in trials lasting up to one year, with some studies suggesting a potential for maintained change when evaluated over time. Research has also evaluated its impact on joint function, primarily in patients with osteoarthritis.

Combination Therapy Trials

Research has also investigated the use of this compound alongside non-pharmacological interventions, such as physical therapy. Research has explored whether this combination may influence the inflammatory response and physical functioning.

  • Opioid Sparing Research: Limited research has assessed its potential role as a supplementary treatment in patients already using short-acting opioid analgesics. The goal of these studies was to evaluate whether co-administration might influence the total daily opioid dosage used in pain management.

Safety Profile and Specific Populations

Initial studies often evaluated lower dose ranges. Its pharmacological profile has been an area of research interest for its potential to interact with other drugs.

  • Hepatic Considerations: Safety profiles observed in clinical trials were generally consistent with those reported for other drugs in its class. Research has indicated that individuals with pre-existing liver conditions may require close monitoring or specific dosage considerations.

Key Studies & References

  1. Clinical Guidance for the Use of Nonsteroidal Anti-inflammatory Drugs in Osteoarthritis: American College of Rheumatology 2019 Guideline

Frequently Asked Questions (FAQ)

Common questions about Arcosal (FAQ)


Q: What is Arcosal used for besides the main condition?

According to official product documents, Arcosal (Tolbutamide) is indicated solely as an addition to diet and exercise to help lower blood glucose levels in adults with Type 2 diabetes mellitus. No other medical uses are officially listed in the regulatory documents.


Q: How quickly does Arcosal start to work after I take it?

The active ingredient in Arcosal, Tolbutamide, reaches its peak concentration in the bloodstream about 3 to 4 hours after being taken by mouth. Detectable amounts are present within 20 minutes of ingestion. This information is based on the drug's established pharmacological profile.


Q: Does Arcosal make you feel tired or drowsy?

Regulatory information lists drowsiness and weakness as possible side effects. It is also important to note that feelings of fatigue and general weakness can be signs of hypoglycemia (low blood sugar), which is a known risk associated with the medication's mechanism of action.


Q: Are there generic versions of Arcosal available?

The generic name for the active ingredient is Tolbutamide. Official databases indicate that the original brand name product, Arcosal, and generic formulations of Tolbutamide have largely been discontinued and are generally no longer available in the United States and other regions.


Q: Can taking Arcosal affect my mood or sleep?

While specific mood and sleep disorders are not prominently listed, official information does associate the medicine with headache. Furthermore, common symptoms of low blood sugar (hypoglycemia), which is the main risk of the drug, can include mental status changes like confusion and restlessness.


Q: Is it true that Arcosal can cause changes in vision?

Official regulatory safety information does not commonly list vision changes as a direct side effect. However, blurred vision is a potential symptom that can occur with severely low blood sugar (hypoglycemia), which is the principal risk associated with this class of drug.


Q: If my symptoms improve, can I stop using Arcosal?

According to official labeling, if blood sugar levels are controlled through diet alone, the medication may be discontinued, or its use may only be required short-term. The decision to start, stop, or change the dose is based on the ongoing response of blood glucose levels to treatment.


Q: Does Arcosal lose its effect over time?

Yes, official pharmacological information acknowledges that the effectiveness of the medication in lowering blood glucose may decrease over time in some individuals. This phenomenon is formally described as secondary failure, and it is a known consideration for this class of drug.


Q: What kind of monitoring might be needed while using Arcosal?

Regulatory information indicates that regular monitoring of blood sugar levels and HbA1c (a measure of long-term control) is needed to track the medication's effect. Patients with pre-existing conditions affecting the liver or kidneys may also require specific monitoring of those functions.


Q: Are headaches a common side effect of Arcosal?

Official documents list headache as a reported side effect of the medicine. It is also noted that headaches can be a common symptom indicating hypoglycemia, which is the primary adverse metabolic event associated with Tolbutamide.


Q: What should I do if a side effect seems mild?

Regulatory safety information suggests that certain mild side effects, such as minor gastrointestinal issues or skin reactions, may be transient and could potentially resolve over time. However, if any symptoms persist, worsen, or cause concern, official guidelines note that discontinuation of the medication may be necessary, and medical guidance should be sought promptly.


Q: Does Arcosal interact with herbal products like St. John's Wort?

Official patient counseling information emphasizes the importance of sharing a complete list of all products being taken, including any herbal products and supplements. This is because many such products may contain substances that could potentially influence the drug's effect or blood sugar levels.


Q: What does 'Black Box Warning' mean for Arcosal?

The official label includes a special warning regarding an observed increase in the risk of cardiovascular mortality (death from heart problems) compared to managing the condition with diet alone. Regulatory mandates require this cautionary statement to be prominently displayed for the entire sulfonylurea drug class.


Q: Can Arcosal be taken with antacids?

Regulatory information indicates that certain antacids, specifically those containing aluminum or magnesium hydroxide, may change how much Tolbutamide the body absorbs. Regulatory guidance suggests separating the administration of Arcosal and these antacids by at least two hours to avoid this potential interaction.


Q: Can Arcosal be taken long-term?

Arcosal is indicated for the management of Type 2 diabetes, which is typically a chronic condition requiring long-term attention. Regulatory information discusses the use of a maintenance dose, which implies sustained use. However, the potential for the medication to lose effectiveness over time is noted.


Q: Are there any common foods or drinks I should avoid while using Arcosal?

Official prescribing information strongly advises against the consumption of alcohol while taking this medication. Alcohol can increase the risk of severe and prolonged low blood sugar (hypoglycemia) and may cause an adverse reaction similar to a disulfiram reaction.


Q: Is Arcosal safe to use for older adults?

Regulatory documents advise that older adults are particularly susceptible to the blood sugar-lowering effect of the drug. For this population, official prescribing information calls for a conservative approach to both the starting and maintenance dosage to reduce the risk of severe hypoglycemia.


Q: Do studies support the use of Arcosal for other conditions?

According to official regulatory documents, the sole condition supported for use is the management of high blood glucose in adults with Type 2 diabetes mellitus. No other medical conditions are officially listed as indications for Arcosal use.


Q: What is the typical length of time people stay on Arcosal?

The medicine is intended for the chronic management of Type 2 diabetes. However, if the medication is no longer effective or if diet alone provides control, the official documents state it may be discontinued.


Q: Does Arcosal interact with blood pressure medications?

Yes, regulatory documents list specific classes of medications commonly used for blood pressure, such as Beta-blockers and certain diuretics (water pills), that are known to interact with Arcosal. These interactions can either potentiate (increase) or diminish (decrease) the drug's effect on blood sugar.


Q: Are there common signs that Arcosal is working?

The primary function is to help the body lower blood sugar. Therefore, the main sign that Arcosal is working is improved blood glucose test results, which include lower readings in self-monitoring and reduced HbA1c levels (a clinical measure of average blood sugar control).


Q: Are there known long-term side effects that official studies track?

Yes, the most significant long-term risk noted for this class of drug is the potential for an increased risk of cardiovascular mortality when compared to using diet alone to manage the condition. This finding is prominently documented in the official safety warnings.


Q: If I have a history of heart issues, can I still use Arcosal?

The entire sulfonylurea drug class is associated with a reported risk of increased cardiovascular mortality. While a history of heart issues is not listed as an absolute prohibition, regulatory information emphasizes that the potential risk associated with the drug class should be considered against the necessity of treating Type 2 diabetes.


Q: Is Arcosal classified as a controlled substance?

Tolbutamide, the active ingredient in Arcosal, is not classified as a controlled medication or a controlled substance under the U.S. Controlled Substances Act.

How should Arcosal be stored and disposed of?

The official storage and disposal guidelines for Arcosal (Tolbutamide) tablets ensure the product remains stable and safe for public health.

Storage Conditions

  • Temperature: Store at Controlled Room Temperature (20 C to 25 C / 68 F to 77 F), with permitted excursions up to 30 C (86 F). The product must be protected from both excessive heat and freezing.
  • Protection: The tablets must be protected from moisture and often from light. The medicine should be kept in its original container and maintained tightly closed when not in use.
  • Child Safety: Arcosal must be stored out of the reach of children to prevent accidental ingestion.

Disposal Instructions

Disposal of unused or expired tablets must follow regulatory instructions. The preferred method is to utilize an authorized drug take-back program. If a take-back option is unavailable, the medicine should be mixed with an unappealing substance (like dirt or coffee grounds) and sealed in a container before being placed in the household trash. The tablets must not be flushed down a toilet or sink.

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

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