Dapsone is a sulfone antibiotic with potent anti-inflammatory properties used both systemically and topically in dermatology. Oral dapsone is the treatment of choice for dermatitis herpetiformis and is used for leprosy, linear IgA bullous dermatosis, and other neutrophilic dermatoses. Topical dapsone 5-7.5% gel (Aczone) is used for inflammatory acne vulgaris. Its unique anti-neutrophilic mechanism makes it valuable for conditions driven by neutrophilic inflammation.
Evidence rating strong. Most-documented uses: treatment of choice for dermatitis herpetiformis, effective for multiple neutrophilic dermatoses, anti-inflammatory acne treatment (topical gel). 10 sources indexed (2018–2025), with 2 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
Exerts antimicrobial activity through inhibition of dihydropteroate synthase (folate synthesis), similar to sulfonamides. Its anti-inflammatory effects are mediated through inhibition of neutrophil myeloperoxidase (MPO), suppression of neutrophil chemotaxis, and inhibition of the alternative complement pathway and leukotriene-mediated tissue damage. These anti-inflammatory properties account for its efficacy in dermatitis herpetiformis and other neutrophilic dermatoses.5
Class
Anti-inflammatory / Dermatologic
Absorption
Water-soluble; take with food
Dosing
Dosing & protocol.
Common range
Oral: 50-100 mg/day for dermatitis herpetiformis; 100 mg/day for leprosy. Topical (Aczone): apply thin layer to affected areas once or twice daily (as prescribed by your physician)
Recommended form
Oral tablets for systemic dermatologic conditions; topical 5% or 7.5% gel (Aczone) for acne
Oral bioavailability >85%; food slightly delays absorption but does not affect overall bioavailability. Take with food to minimize GI upset. Topical formulation has minimal systemic absorption.
Safety
Full safety detail.
Side effects
Hemolytic anemia (dose-dependent; worse in G6PD-deficient patients)
Activated charcoal can bind dapsone in the gut and can also accelerate elimination by interrupting enterohepatic or enteroenteric recirculation. This is useful in overdose under medical supervision, but routine charcoal supplementation can lower therapeutic dapsone exposure and may worsen disease control. Repeated charcoal doses are more concerning than a single isolated dose.
Recommendation: Do not take activated charcoal routinely while using oral dapsone unless poison control or your clinician tells you to. If you take charcoal for a non-emergency reason, separate it from dapsone by at least 4 hours and tell your prescriber if you use it repeatedly. In overdose or suspected toxicity, seek emergency care rather than self-treating.
Dapsone can cause methemoglobinemia and hemolysis through oxidative metabolites. High-dose vitamin C has reducing and antioxidant activity and has been reported as a treatment option for dapsone-induced methemoglobinemia when methylene blue is unavailable or unsuitable, with supportive animal data. Ordinary over-the-counter vitamin C should not be relied on to prevent or self-treat dapsone toxicity.
Recommendation: Do not use vitamin C to mask blue lips, gray skin, shortness of breath, severe fatigue, or low oxygen readings while on dapsone. Seek urgent care for those symptoms because methemoglobin levels may need measurement and medical treatment. If you take routine vitamin C, keep the dose modest unless your clinician directs otherwise.
Khan I, Qasim SA, Rath S et al.. Efficacy and safety of dapsone in adult immune thrombocytopenia: a systematic review and meta-analysis. European journal of medical research. 2025
Wu Z, Wang C, Wang Z et al.. Risk factors for dapsone resistance in leprosy patients: a systematic meta-analysis. Journal of global antimicrobial resistance. 2022
Tangamornsuksan W, Lohitnavy M. Association Between HLA-B*1301 and Dapsone-Induced Cutaneous Adverse Drug Reactions: A Systematic Review and Meta-analysis. JAMA dermatology. 2018
Abtahi-Naeini B, Sattari H, Afshar K et al.. Efficacy and Safety of Topical Dapsone in Dermatology: A Scoping Review of Clinical Studies. Journal of cosmetic dermatology. 2025
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