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Dapsone 5% and 7.5% gel (acne)
A topical sulfone for inflammatory acne that works measurably better in women than in men, and is safe in G6PD deficiency despite the oral drug's reputation.
Prescription medication — not a dietary supplement
Dapsone (topical) is a prescription (or investigational) drug, not a supplement. It is included here for reference because people research and discuss it (often used off-label) — not as a recommendation. Take it only under a qualified clinician's supervision and only as prescribed; do not source it from grey-market vendors, where identity, purity, and dosing are unverified. The evidence below reflects its clinical trials.
What the evidence says
Most Dapsone (topical) studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 2007–2026 with a typical study size of 3,010 participants.
Based on 10 studies · 2 meta-analyses · 6 RCTs · 44,697 total participants
Confidence
High confidenceBy outcome
A clean effect on a large evidence base, with a modest size and one uncomfortable caveat. A meta-analysis of 7 trials and 11,424 participants gives odds ratio 1.51 (95% CI 1.38-1.66) with I-squared of 0%, which is unusually consistent. A systematic review of 14 studies puts 12-to-16-week treatment success at 40.1-69.4% for the 5% gel. The sex difference is real and replicated (46.6% vs 35.8% lesion reduction; OR 1.80 for women). Held at Moderate because an analysis including dapsone found the vehicle accounts for about 55% of the apparent effect of topical acne drugs, because adding adapalene or benzoyl peroxide to it did not beat adding moisturiser for inflammatory lesions, and because it lost a small head-to-head against topical spironolactone.
Our research database did not respond in time, so the studies and count above cover only our curated set. This refreshes automatically.
Dapsone gel is an anti-inflammatory sulfone approved for acne, used when the first-line options have failed or are not tolerated. Two things make it distinctive.
The first is that it works better in women: in a pooled analysis of two phase 3 trials, total lesion counts fell 46.6% in treated women against 35.8% in treated men, and clinical success was 48.6% against 34.4%.
A meta-analysis of 11,424 participants reached the same conclusion, odds ratio 1.80 in favour of female patients against 1.51 overall. The second is a safety question that answers better than expected.
Oral dapsone causes haemolysis in people with G6PD deficiency, and the topical version was tested directly in 64 G6PD-deficient patients. It produced a 0.32 g/dL fall in haemoglobin at two weeks that had resolved by twelve, with no clinical or laboratory evidence of haemolytic anaemia.
Against that sit two findings worth knowing. Adding adapalene or benzoyl peroxide to dapsone did not significantly beat adding plain MOISTURISER for inflammatory lesions in a 301-patient trial.
And an analysis of eight topical acne preparations, dapsone among them, found that the vehicle accounted for an average 55% of the apparent drug effect, reaching close to 90% in some cases. That is a caveat about the whole topical acne category rather than this drug alone, but dapsone was in the sample.
Dapsone is a sulfone. In acne its benefit is attributed mainly to suppressing neutrophil function and inflammatory mediators rather than to killing Cutibacterium acnes, which is why inflammatory lesions respond more than comedones in every trial and why it is not treated as an antibiotic for resistance-stewardship purposes.
Oral dapsone carries haemolysis, methaemoglobinaemia and agranulocytosis risks that rule it out for acne. The aqueous gel was developed to deliver a clinically effective dose to the skin with minimal systemic absorption, which is the entire reason a topical version exists.
Women respond better on every measure reported, consistently across a 2,898-patient pooled analysis and an 11,424-participant meta-analysis. The papers report the difference and propose sex as a predictor of outcome that trial design should account for. Neither offers a mechanism.
Consult a clinician. Systemic absorption from the gel is minimal, but no adequate trials in pregnancy support a blanket statement, and acne treatment is rarely urgent.
Directly studied. A crossover trial in 64 G6PD-deficient patients found a 0.32 g/dL haemoglobin fall at two weeks that resolved by twelve, with no clinical or laboratory evidence of haemolytic anaemia. The pivotal trials found no clinically significant haemoglobin change either. This is the opposite of the oral drug's profile.
Trials enrolled patients aged 12 and over. Below that age a clinician decides.
A pooled phase 3 analysis of 2,216 patients with Fitzpatrick phototypes I-III and 2,111 with types IV-VI found significant improvement in both groups, with a similar adverse-event profile.
Applying benzoyl peroxide and dapsone gel together can temporarily turn skin and facial hair yellow or orange. It is cosmetic and washes out, and the two were studied together without safety concern, but applying them at different times of day avoids it.
Systemic absorption from the gel is minimal, but combining it with systemic dapsone or other oxidising drugs adds to the same haematological risk. Worth raising with the prescriber rather than assuming the topical route makes it irrelevant.
Dapsone (topical) has an evidence score of 6/10 — moderate evidence based on 10 indexed studies, including 2 meta-analyses. A topical sulfone for inflammatory acne that works measurably better in women than in men, and is safe in G6PD deficiency despite the oral drug's reputation. Representative study: PMID 42105175.
The commonly studied dose of Dapsone (topical) is Dapsone 5% gel applied twice daily, or dapsone 7.5% gel applied once daily, to the affected area. Twelve weeks is the trial duration on which the approvals rest. A prescription medicine and a clinician's decision.. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
Timing is flexible for Dapsone (topical) — consistent daily use matters more than the time of day. No time-of-day pharmacology.
Dapsone (topical) is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are dryness, scaling, erythema or stinging at the application site, temporary yellow or orange discolouration of skin and facial hair when used with benzoyl peroxide. Use caution if any of these apply to you: Known hypersensitivity to dapsone or sulfones.
Adapalene
Mostly mechanism / observationalA modern topical retinoid for acne — now available over the counter (0.1%) as well as by prescription (0.3%). A drug, not a supplement or cosmetic. Adapalene is a third-generation retinoid selective for the retinoic-acid receptor beta; it normalizes how skin cells shed (comedolytic) and is anti-inflammatory. The honest framing: this is one of the best-evidenced acne treatments — a 5-trial meta-analysis and a 40-trial network meta-analysis show it matches tretinoin's efficacy with faster onset and notably better tolerability, and the adapalene-benzoyl peroxide combination is among the most effective regimens available. Caveats: it still causes retinoid irritation and slow onset, it is not superior to (only as good as) other retinoids, and — as a retinoid — it is generally avoided in pregnancy.
Benzoyl Peroxide
Mostly mechanism / observationalA frontline over-the-counter acne medicine applied to the skin — a drug, not a supplement or cosmetic. Benzoyl peroxide (BPO) kills the acne bacterium Cutibacterium (Propionibacterium) acnes by an oxidative mechanism that, crucially, does NOT drive antibiotic resistance, and it is also mildly comedolytic and anti-inflammatory. The honest framing: this is one of the best-evidenced topical acne treatments — a 120-trial Cochrane review and a 35-RCT network meta-analysis show it beats placebo and matches topical antibiotics — but it commonly causes dryness and irritation, it bleaches fabrics, towels, and hair, and BPO monotherapy is consistently outperformed by fixed combinations (adapalene-BPO, clindamycin-BPO). A genuinely effective acne drug with real, manageable downsides.
Tretinoin (Retin-A)
Mostly mechanism / observationalA prescription TOPICAL retinoid (Retin-A, Renova) — the acid form of vitamin A and the gold-standard, best-evidenced topical treatment for photoaging and acne. Multiple double-blind RCTs show it reduces fine wrinkles, mottled hyperpigmentation, and roughness over months, with histologic increases in dermal collagen. Caveats: retinoid dermatitis (irritation, peeling, dryness), photosensitivity, and it is CONTRAINDICATED IN PREGNANCY. Prescription drug, not a supplement; distinct from weaker OTC 'retinol' cosmetics.
Azelaic Acid
Mostly mechanism / observationalA topical skincare acid applied to the skin for rosacea, acne, and uneven tone — unusual among 'cosmetic' actives because it has genuine drug-grade evidence. Azelaic acid is a naturally occurring dicarboxylic acid that is anti-inflammatory, antimicrobial, and a tyrosinase inhibitor. It is sold both as an over-the-counter cosmetic (around 10%) AND as a 15-20% prescription medication. The honest framing: the strongest, best-replicated evidence — including double-blind phase III trials and a Cochrane review that rated it high-quality for papulopustular rosacea — used the PRESCRIPTION strengths (15-20%), not the ~10% OTC cosmetic form. It also has solid evidence for acne and melasma. Head-to-head it is beaten for acne (by benzoyl peroxide + clindamycin) and tends to cause more local irritation (burning, stinging) than several comparators. For rosacea or persistent acne, the prescription form under a clinician is the evidence-based route.
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Reviewed by Dr. Baher Al Hakim · Last reviewed September 2026 · evidence from 10 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.