Aczone

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Aczone

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 Aczone

What is Aczone: Definition and Pharmacological Classification

Property Description
Active ingredient Dapsone
Form Topical Gel (Semisolid)
Pharmacological class Sulfone; Antibacterial and Anti-inflammatory Agent
Origin Synthetic Drug Compound

Aczone is a specialized dermatological preparation and a prescription-only medication formulated for topical use on the skin, distinguishing it as a localized treatment option. Its sole active ingredient is Dapsone, a synthetic drug compound that is chemically identified as 4,4′-diaminodiphenyl sulfone. This monosemantic product is classified as a synthetic sulfone drug.

Dapsone belongs to the unique chemical family of sulfone agents, setting it apart from other topical therapies. Dapsone is recognized for its role as both an antibacterial agent and a potent anti-inflammatory agent. This suggests the medicine provides a benefit by targeting both the microbial factors and the redness associated with inflammatory skin conditions. Its mechanism of action involves the inhibition of neutrophil activity, a cellular process involved in driving skin inflammation. This means the medicine helps to calm the skin by reducing the cellular response that causes swelling and irritation.

Aczone's Formulation and General Therapeutic Purpose

The medicine is supplied exclusively as a topical gel, which is a semisolid dosage form designed for topical administration, meaning it is applied directly to the skin surface. This formulation utilizes an aqueous gel vehicle intended to facilitate the localized delivery of the Dapsone active substance.

Unlike preparations designed for systemic absorption, this specific topical gel aims to maximize the local concentration of Dapsone. The formulation is intended to provide targeted action for patients dealing with inflammatory skin lesions. The purpose of this formulation is to help relieve the visible signs of inflammatory skin conditions by addressing the two primary contributing factors at the site of application. The dual functionality—the control of surface bacteria combined with the significant reduction of inflammation—is the core benefit of this preparation.

Regulatory References

  1. Dapsone anti-inflammatory properties - PubMed

What side effects are possible with Aczone?

Possible Side Effects and Safety Information

The safety profile of Aczone (dapsone topical gel) details adverse reactions and safety constraints as officially documented by government regulatory sources.

Adverse Reactions and Frequency

Adverse reactions are classified by the frequency of occurrence reported in clinical data and postmarketing surveillance.

System Organ Class Adverse Reaction Frequency Classification
Application Site Conditions Dryness, Oiliness/Peeling, Erythema (Redness) Most Common (incidence ge 10%)
Application Site Conditions Burning, Pruritus (Itching) Common (incidence ge 1%)
General/Nervous System Pyrexia (Fever), Headache Common (incidence ge 1%)
Postmarketing Reports Methemoglobinemia, Rash, Swelling of face Incidence Not Known

Serious Safety Considerations

The official labeling highlights the risk of Methemoglobinemia, a serious blood disorder reported postmarketing that involves elevated methemoglobin levels. The product's classification as a sulfone requires specific safety notes regarding potential hematologic effects (e.g., hemolysis), particularly in patients with Glucose-6-Phosphate Dehydrogenase (G6PD) deficiency.

Safety Restrictions and Limitations

Specific constraints are placed on use to manage documented risks:

  • Avoid Use: The medicine is restricted for use in individuals with congenital or idiopathic methemoglobinemia due to increased susceptibility to drug-induced methemoglobinemia.
  • Interaction Note: Concomitant topical application with benzoyl peroxide may lead to a temporary local yellow or orange skin discoloration.
  • Duration Pattern: Symptoms of methemoglobinemia may be delayed some hours after exposure.

This documented safety framework defines the risks, expected reactions, and mandatory limitations associated with the use of the topical dapsone gel formulation.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory overdose profile for Aczone (Dapsone gel) focuses on the potential for systemic toxicity primarily involving the blood system. The main documented risk following excessive exposure or accidental oral ingestion is the development of methemoglobinemia.

Documented Manifestations and Emergency Action

Methemoglobinemia is clinically manifested by the appearance of slate grey cyanosis on the buccal mucous membranes, lips, and nail beds. Severe methemoglobinemia can progress to life-threatening outcomes including CNS depression and seizures.

Regulatory instructions mandate that patients must discontinue the medicine and seek immediate medical attention upon the occurrence of cyanosis. Immediate medical consultation is also required if signs of hemolytic anemia are present, such as dark-brown urine, paleness, or unusual tiredness.

Supportive Measures and Risk Factors

Management of severe toxicity involves supportive measures and may require administering the antidote Methylene Blue to reduce the level of methemoglobin in the blood. Patients diagnosed with Glucose-6-phosphate dehydrogenase (G6PD) deficiency or congenital methemoglobinemia are documented as being more susceptible to this type of hematologic toxicity.

Therapeutic Uses of Aczone

What Aczone Treats: Main Uses and Benefits

Aczone is commonly used for the topical management of acne vulgaris, focusing on conditions characterized by noticeable inflammatory symptoms. The use of dapsone gel is indicated for patients aged 9 years and older. The treatment helps address symptom clusters that may become intense or disruptive, specifically redness, swelling, and the formation of visible papules and pustules. This approach is often applied during phases when symptoms become more noticeable, providing supportive management against both the inflammation and contributing surface bacteria.

The medication is commonly used for managing symptoms associated with moderate acne, and its focused action is relevant for easing distress during symptomatic periods. It is commonly used across conditions presenting with localized discomfort. This support may help ease the overall burden of visible symptoms and may assist with managing the overall lesion burden.


Quick Fact: Relief for Inflammatory Acne Symptoms

Regulatory References

  1. US National Institutes of Health DailyMed resource

Eligibility and Restrictions for Use

Aczone (dapsone) Gel is approved for use in the topical treatment of acne vulgaris in patients aged 9 years and older (for the 7.5% strength). Its use is not recommended in younger children as safety and effectiveness have not been established in patients below this age.

Contraindications and Restrictions

Official regulatory documents identify specific populations who must avoid using Aczone Gel due to the risk of serious blood disorders:

  • Hypersensitivity: The medicine is strictly contraindicated in individuals with a known hypersensitivity or allergy to dapsone or any other component of the formulation.
  • Methemoglobinemia: Use must be avoided in patients with congenital or idiopathic methemoglobinemia, a condition that increases the risk of methemoglobinemia, a disorder that reduces the blood’s capacity to carry oxygen.
  • Concomitant Therapy: Patients taking oral dapsone or antimalarial medications should avoid using Aczone Gel due to the potential for hemolytic reactions (red blood cell breakdown). Patients with Glucose-6-Phosphate Dehydrogenase (G6PD) deficiency are more susceptible to this effect. Additionally, use with other methemoglobinemia-inducing agents should be considered with caution.
  • Pregnancy/Lactation: The medicine is a Pregnancy Category C, and should be used only if the potential benefit outweighs the risk to the fetus. A clinical decision must be made regarding whether to discontinue nursing or discontinue the drug due to the potential for adverse effects in the breastfed infant.

What should I know about interactions with other medicines?

The official interaction profile for Aczone (Dapsone Gel) is defined by pharmacokinetic and pharmacodynamic constraints documented in regulatory labeling.

Documented Pharmacokinetic and Hemolytic Risks

The regulatory documents restrict co-administration with substances that carry a hemolytic risk. Co-use with oral dapsone or antimalarial medications is restricted due to the potential for hemolytic reactions. A clinically significant pharmacokinetic interaction is documented with Trimethoprim/Sulfamethoxazole (TMP/SMX). Studies show that this co-administration increases the systemic exposure of dapsone and, notably, more than doubles the level of the dapsone hydroxylamine metabolite, which is associated with hemolytic events. This combination may increase the likelihood of hemolysis in patients with Glucose-6-Phosphate Dehydrogenase (G6PD) deficiency, a specific population consideration.

Pharmacodynamic and Localized Interactions

A separate pharmacodynamic interaction is documented when Aczone is used alongside other methemoglobinemia-inducing agents, such as certain sulfonamides, nitrates, nitroglycerin, and acetaminophen. This combination can result in elevated methemoglobin levels due to an additive effect. A non-systemic, localized effect is documented when the gel is co-administered with topical benzoyl peroxide. This combination may result in a temporary local yellow or orange discoloration of the skin or facial hair at the application site; the official labeling does not specify a mandatory time separation rule for this localized interaction.

Mechanism of Action

How Aczone Works

Aczone's active ingredient, dapsone, modulates two distinct biological mechanisms within the skin, focusing its physiological effect specifically at the site of application.


Targeted Modulation of Neutrophil Enzyme Systems

This domain covers the primary anti-inflammatory mechanism, where dapsone acts on neutrophils by inhibiting the Myeloperoxidase (MPO) enzyme system. MPO is responsible for generating destructive Reactive Oxygen Species (ROS) during the immune cell's respiratory burst . By suppressing this enzyme and interfering with chemotaxis signaling, the drug reduces the acute cellular events that cause localized tissue destruction. This alters the activity of the host's inflammatory response.


Bacteriostatic Disruption of Folic Acid Synthesis

The secondary mechanistic domain addresses the microbial aspect, where dapsone acts as a competitive antagonist against the enzyme dihydropteroate synthase in Cutibacterium acnes. This inhibition blocks the bacteria's critical folic acid synthesis pathway, which is essential for growth and replication. This metabolic interference restricts the proliferation of the bacteria that contribute to inflammation, contributing to altered microbial kinetics within the targeted pathways.

Dosage and Administration Information

How to Use Aczone (Dapsone) Gel: Administration Guidelines

Aczone (dapsone) Gel is intended for topical use only. It must be applied directly to the skin and is not for oral, ophthalmic (eye), or intravaginal use.


Dosing and Frequency

Product Strength Standard Adult Dosing Frequency Age Group
Aczone Gel, 5% Apply a pea-sized amount in a thin layer. Twice Daily (BID) 12 years of age and older
Aczone Gel, 7.5% Apply a pea-sized amount in a thin layer. Once Daily (QD) 9 years of age and older

Procedural Steps

The proper administration of Aczone Gel includes the following procedural steps:

  1. Preparation: The skin should be gently washed and patted dry before the gel is applied.
  2. Application: Apply the specified pea-sized amount in a thin layer to the entire affected area and gently rub it in completely.
  3. Hygiene: Wash hands thoroughly and immediately after applying the gel.
  4. Avoidance: Strict care must be taken to prevent the gel from getting into the eyes, mouth, or nose. If accidental contact occurs, the area must be rinsed immediately with water.

If no visible improvement is observed after 12 weeks of continuous use, the treatment should be professionally reassessed.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Aczone

Evidence for Use in Acne Vulgaris

This section will summarize the clinical studies, primarily randomized controlled trials, that have investigated the use of Aczone (dapsone) Gel in individuals with signs and symptoms of acne vulgaris. It will outline what these studies set out to measure and how they generally report their findings related to acne lesions.

Research has examined Aczone primarily in patients with acne vulgaris, a condition characterized by fluctuating or episodic manifestations of lesions. Findings indicate that changes measured during the study period, including observations related to the number of certain types of acne lesions, were observed in patients using Aczone Gel. Research provides insight into short-term changes, but the results apply only to the populations studied, and individual responses may vary.


Evidence for Use in Rosacea

This section will describe the available research, including small-scale studies and case reports, that have explored the experience of using Aczone (dapsone) Gel for inflammatory lesions associated with rosacea. It will clarify that this is not a primary approved indication and will focus on summarizing the descriptive evidence that exists.

These studies focused on outcomes related to physical discomfort and the appearance of inflammatory lesions typical of rosacea. The available evidence from these smaller settings is descriptive. Because this is not an approved use, the evidence is limited, and the certainty remains low due to the size and type of studies conducted for this purpose.


Long-term Studies and Follow-up

Studies have monitored the use of Aczone over defined time intervals to better understand the patterns observed after the initial short-term observation period. Research suggests that a continued application may be associated with maintaining the patterns observed in the studies. However, a critical limitation is that long-term effects are not fully established beyond the scope of these extended clinical trials; follow-up durations were limited in many key trials.


What is Still Uncertain About Aczone

Despite the body of research, several aspects of Aczone use are still being explored or have limitations. A key area relates to insufficient comparative evidence. Furthermore, findings were mixed or inconsistent across studies, and the sample sizes were modest in some of the subgroup studies. Data are still emerging regarding optimal use in different combinations with other treatments. Research provides context but not individual predictions, emphasizing that evidence highlights what is known and what is still uncertain about Aczone.

Key Studies & References

  1. A Phase 3, Multi-Center, Randomized, Vehicle-Controlled Study of Dapsone 7.5% Gel for the Treatment of Acne Vulgaris

Frequently Asked Questions (FAQ)

Common questions about Aczone (FAQ)

Q: What happens if I miss a day of applying Aczone?

A: According to official product information, if a dose is missed, applying it as soon as it is remembered is the standard course of action. However, if it is nearly time for the next scheduled application, the missed dose is typically skipped, and the regular dosing schedule is resumed. The guidance is to avoid applying extra gel to compensate for a missed dose.

Q: Is Aczone meant to be used for the long term or just short periods?

A: Clinical trials demonstrating Aczone's effectiveness and safety in treating acne vulgaris typically assessed use for periods up to 12 weeks. If no visible improvement is observed after 12 weeks of continuous application, official guidelines indicate that reassessment by a healthcare professional is appropriate.

Q: Can Aczone help with cystic acne or just surface pimples?

A: Aczone is approved for the topical treatment of acne vulgaris. Clinical trials for the approved indication included patients whose acne severity varied, involving different types of inflammatory lesions. Its effectiveness is based on reducing both inflammatory and non-inflammatory lesions.

Q: Is it normal to feel a mild stinging sensation after applying Aczone?

A: The most common application site reactions include dryness, peeling, and redness. Burning and pruritus (itching) have also been reported and may be described as a stinging sensation. If any irritation or sensation becomes severe or overly bothersome, consulting a healthcare provider is appropriate.

Q: Can I apply makeup or sunscreen after using Aczone gel?

A: While official product information focuses on drug administration, official labeling does indicate minimizing exposure to sunlight is important during treatment. When sun exposure is expected, the use of sunscreen and protective clothing over the treated areas is part of the official guidance.

Q: Are there any specific cleansers or moisturizers I should avoid while using Aczone?

A: Clinical study protocols often reference the use of a mild, non-medicated cleanser prior to application. These protocols also generally mention avoiding the application of new brands of cosmetics, creams, or other topical products to the area being treated.

Q: Will Aczone still work if I use it less than twice a day?

A: The established frequency for Aczone 5% is twice-daily use, and for Aczone 7.5% it is once-daily use. The clinical efficacy and safety of using the product less frequently than the prescribed regimen have not been established in the official labeling.

Q: Can Aczone cause skin discoloration or hyperpigmentation?

A: The official product labeling documents a specific non-systemic interaction: if Aczone is applied alongside topical benzoyl peroxide, it may result in a temporary local yellow or orange discoloration of the skin or facial hair at the application site. General, long-term hyperpigmentation is not listed as a common side effect.

Q: Is Aczone safe to use during the summer or in direct sunlight?

A: Official product information emphasizes minimizing exposure to natural or artificial sunlight, such as sunlamps, during treatment. When sun exposure cannot be avoided, the use of sunscreen and protective clothing over the treated areas is part of the official guidance.

Q: What foods or supplements might interact with Aczone?

A: The official prescribing information for Aczone lists specific drug-to-drug interactions, primarily with oral dapsone and other medications that may increase the risk of blood disorders. However, there are no specific cautions or restrictions listed in the regulatory labeling regarding food or dietary supplements.

Q: Is it necessary to wait a certain time before applying other topical treatments after Aczone?

A: Official information does not specify a mandatory time separation for all other topical treatments. However, the label does note that a localized interaction with topical benzoyl peroxide is possible, which can cause temporary yellow or orange discoloration.

Q: Why do some people use Aczone for purposes other than acne?

A: Aczone is approved by the FDA only for the topical treatment of acne vulgaris. The patient counseling information emphasizes that the medicine should only be used for the disorder for which it has been prescribed.

Q: Is Aczone considered safe for teenagers and young adults?

A: Aczone is indicated for use in specific pediatric populations as defined by age. Aczone 7.5% is indicated for patients aged 9 years and older, and Aczone 5% is indicated for patients aged 12 years and older. Safety and effectiveness have not been established in children below these ages.

Q: Can men and women use Aczone for acne with the same results?

A: Clinical trials used to establish the effectiveness of Aczone included both male and female patients with acne vulgaris. The official product labeling does not indicate that results or efficacy differ based on gender.

Q: Does Aczone need to be refrigerated or stored in a special way?

A: Aczone gel must be stored at controlled room temperature, between 68^circF to 77^circF (20^circC to 25^circC). It is important that the gel is protected from freezing, excess heat, moisture, and direct light to maintain its stability.

Q: Is there any research evidence showing Aczone's effectiveness compared to benzoyl peroxide?

A: Official labeling does not contain formal comparative effectiveness data from studies directly comparing Aczone against benzoyl peroxide. However, the regulatory documents acknowledge that a temporary local discoloration can occur when the two products are used together.

Q: What should I do if my skin gets very dry or irritated from Aczone?

A: Dryness, peeling, and redness are reported as the most common side effects from the application site. If skin dryness or irritation becomes severe or overly bothersome, consulting a healthcare professional is appropriate.

Q: What should I look for to know if Aczone is starting to work?

A: Effectiveness in clinical trials was primarily measured by objective criteria, including reductions in the total number of acne lesions (both inflammatory and non-inflammatory). Success was also assessed using a Global Acne Assessment Score, which involves observing overall improvement.

Q: Are headaches a potential side effect of using Aczone?

A: Headache is reported as a common adverse reaction (incidence ge 1%) in clinical trials for Aczone gel.

Q: Will using more Aczone than prescribed make it work faster?

A: Official information indicates that using more of the product or using it more frequently than prescribed may increase the chance of experiencing unwanted effects without necessarily improving effectiveness. The medication should be used exactly as directed.

Q: Are there any known interactions between Aczone and common pain relievers like ibuprofen?

A: The label advises against concomitant use with other medications that induce methemoglobinemia, such as acetaminophen. However, the regulatory label does not specifically list or advise against the use of non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen.

Q: What are the signs of an allergic reaction to Aczone?

A: Aczone is contraindicated for individuals with a known allergy to dapsone or any other component. Signs of a serious allergic reaction may include hives, difficulty breathing, or swelling of the face, lips, tongue, or throat.

Q: Can I use Aczone if I have a sulfur allergy?

A: Aczone is classified as a sulfone drug, which is chemically distinct from sulfonamide antibiotics. Any individual with a known history of hypersensitivity or allergy to dapsone, the active ingredient, or any component of the gel, is advised to avoid its use.

Q: Is it true that Aczone can interfere with certain lab tests?

A: Due to the potential for hematologic effects, such as methemoglobinemia and hemolysis, regulatory documents indicate that the use of Aczone may necessitate laboratory monitoring in certain patients, including complete blood counts.

Q: What research supports the use of Aczone as a monotherapy for acne?

A: Pivotal clinical trials conducted to demonstrate the drug's safety and effectiveness utilized Aczone gel as monotherapy, meaning it was used as a stand-alone treatment against a vehicle control. This research forms the basis for its approved indication for acne vulgaris.

How should Aczone be stored and disposed of?

How to Store and Dispose of Aczone?

This section explains the mandated storage and disposal requirements for Aczone (dapsone) Gel as detailed in official regulatory prescribing information.


Official Storage Requirements

Storage Rule Requirement
Temperature Store at Controlled Room Temperature, between 68^circF to 77^circF (20^circC to 25^circC).
Prohibitions Do not freeze and store away from excess heat and moisture.
Container Keep in the original container, ensuring the cap is tightly closed when not in use.
Protection Protect from direct light.

️ Stability and Disposal

Handling and Disposal Rule Requirement
In-Use Stability Discard any unused gel 14 weeks after the container is first opened.
Child Safety Keep Aczone out of the sight and reach of children and pets in a safe location.
Disposal Do not keep outdated medicine. Consult a healthcare professional or pharmacist on how to properly dispose of unused or expired medication.

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

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