Sodium Sulfacetamide for Acne: Does It Work?

What it is

Sodium sulfacetamide is a sulfonamide antibiotic used on the skin rather than swallowed. It blocks the bacterial enzyme that converts para-aminobenzoic acid into folic acid, which stops bacteria, including the Cutibacterium acnes that lives in the follicle, from multiplying. It is almost always sold combined with sulfur, typically as sodium sulfacetamide 10 percent with sulfur 5 percent in a wash, cleanser, cream or foam, and the sulfur adds its own keratolytic and drying action. The labels cover acne vulgaris, acne rosacea and seborrhoeic dermatitis. In the United States most of these products are dispensed on prescription, which gives them an air of medical seriousness that their regulatory status does not actually support.

What the evidence actually shows

The guideline’s wording is blunt. Available evidence, it says, is insufficient to develop a recommendation on the use of topical glycolic acid, sulfur, sodium sulfacetamide and resorcinol for acne treatment. That is not a finding that the ingredient fails. It is a finding that the trials needed to judge it are not there.

What is there: a 2015 review in Cutis by Wolf and Silapunt cites two twelve-week studies from the 1990s in which inflammatory lesions fell by 80.4 to 83 percent with twice-daily sodium sulfacetamide 10 percent and sulfur 5 percent. Those figures look impressive until you ask what they were compared against. One of them, Breneman and Ariano’s 1993 study in women, was screened by NICE when it built the evidence base for its 2021 acne guideline and thrown out with the stated reason “no relevant study design – not RCT”. Uncontrolled acne studies routinely show large improvements, because acne fluctuates on its own and because washing your face twice a day is itself an intervention.

The most recent published series, in the Journal of Clinical and Aesthetic Dermatology in 2009, is eight patients treated with the emollient foam, some of them alongside other acne medications, followed for four to eight weeks. No randomisation, no control group.

I could not find a vehicle-controlled randomised trial of sodium sulfacetamide in acne at all. The regulatory position matches. The DailyMed labels for these products carry the line “This drug has not been found by FDA to be safe and effective, and this labeling has not been approved by FDA”, under the marketing category “unapproved drug other”. They are legacy products that predate the modern approval pathway. The guideline landed on insufficient because that is genuinely all there is.

How it is actually used

It comes as a wash, cleanser, cream, lotion or foam, usually sodium sulfacetamide 10 percent with sulfur 5 percent, applied once or twice daily; washes are left on briefly and rinsed. If a clinician has prescribed it, twelve weeks is the window the older studies used, so judging it much before eight weeks is premature. Applied with benzoyl peroxide it can produce a temporary orange-brown discoloration, though in the one published test that colour washed out. Given that the guideline could not recommend it, this is not an ingredient to go seeking out on your own initiative. Benzoyl peroxide, topical retinoids and their fixed-dose combinations carry strong recommendations on moderate-certainty evidence, and cost less. It is sometimes prescribed when better-supported options are not tolerated, but nothing in the trial record establishes how well it works in that role.

Safety and who should avoid it

It is a sulfonamide, so anyone with a sulfa allergy should avoid it. The label lists rare but serious systemic sulfonamide reactions, including agranulocytosis, acute haemolytic anaemia, purpura haemorrhagica, drug fever and jaundice, warns against use on denuded or abraded skin, and the label I read contraindicates it in kidney disease. Everyday complaints are local: dryness, redness, itching, and the sulfur smell. Pregnancy is a clinician’s call. The Cutis review lists it under the old pregnancy category C and notes a theoretical kernicterus concern in nursing, carried over from systemic sulfonamides. Long-term safety data specific to acne use are not something I could find.

Commonly repeated: Sodium sulfacetamide permanently stains skin and facial hair orange if you use benzoyl peroxide with it, the same way dapsone gel does. What the evidence actually shows: In the published test of this interaction, Dubina and Fleischer’s 2009 experiment in Archives of Dermatology, benzoyl peroxide produced an orange-brown discoloration with both drugs, but the sulfacetamide stains washed out completely while only the dapsone stains survived washing. The discoloration is real; the permanence belongs to dapsone. And the experiment was run on white cotton napkins, not on skin.

Sources

• American Academy of Dermatology. Updated guidelines for the management of acne (summary of Reynolds RV et al., J Am Acad Dermatol 2024)
• Inside the 2024 AAD Acne Guidelines: New Therapies Join Old Standbys (quotes the guideline’s insufficient-evidence statement verbatim), Dermatology News/MDedge 2024
• Wolf K, Silapunt S. The Use of Sodium Sulfacetamide in Dermatology, Cutis 2015;96:128-130
• Draelos ZD et al. The Use of Sodium Sulfacetamide 10%-Sulfur 5% Emollient Foam in the Treatment of Acne Vulgaris (case series), J Clin Aesthet Dermatol 2009;2(8):26-29
• NICE NG198 evidence review F. Management options for mild to moderate acne – excluded studies appendix (Breneman 1993 excluded: not an RCT), 2021
• DailyMed. Sodium Sulfacetamide 10% – Sulfur 5% Cleanser label (marketing category: unapproved drug other)
• Dubina MI, Fleischer AB Jr. Interaction of Topical Sulfacetamide and Topical Dapsone With Benzoyl Peroxide, Arch Dermatol 2009;145(9):1027-1029

Keep reading

See where this sits against every other acne treatment on the acne treatment evidence map, or check how it combines with another ingredient in the ingredient combination checker. For the guideline’s own wording on this, see the 2024 AAD guideline, recommendation by recommendation.

Not medical advice

This page reports what the published evidence says about a treatment. It is not a treatment plan and it cannot account for your skin, your other medications or your medical history. Nothing here has been reviewed by a clinician; see our editorial policy for what that means. Talk to a clinician before starting or stopping any prescription treatment.