Effectiveness of spironolactone for women with acne vulgaris (SAFA) in England and Wales: pragmatic, multicentre, phase 3, double blind, randomised controlled trial

Abstract

Objective To assess the effectiveness of oral spironolactone for acne vulgaris in adult women. Design Pragmatic, multicentre, phase 3, double blind, randomised controlled trial. Setting Primary and secondary healthcare, and advertising in the community and on social media in England and Wales. Participants Women (≥18 years) with facial acne for at least six months, judged to warrant oral antibiotics. Interventions Participants were randomly assigned (1:1) to either 50 mg/day spironolactone or matched placebo until week six, increasing to 100 mg/day spironolactone or placebo until week 24. Participants could continue using topical treatment. Main outcome measures Primary outcome was Acne-Specific Quality of Life (Acne-QoL) symptom subscale score at week 12 (range 0-30, where higher scores reflect improved QoL). Secondary outcomes were Acne-QoL at week 24, participant self-assessed improvement; investigator’s global assessment (IGA) for treatment success; and adverse reactions. Results From 5 June 2019 to 31 August 2021, 1267 women were assessed for eligibility, 410 were randomly assigned to the intervention (n=201) or control group (n=209) and 342 were included in the primary analysis (n=176 in the intervention group and n=166 in the control group). Baseline mean age was 29.2 years (standard deviation 7.2), 28 (7%) of 389 were from ethnicities other than white, with 46% mild, 40% moderate, and 13% severe acne. Mean Acne-QoL symptom scores at baseline were 13.2 (standard deviation 4.9) and at week 12 were 19.2 (6.1) for spironolactone and 12.9 (4.5) and 17.8 (5.6) for placebo (difference favouring spironolactone 1.27 (95% confidence interval 0.07 to 2.46), adjusted for baseline variables). Scores at week 24 were 21.2 (5.9) for spironolactone and 17.4 (5.8) for placebo (difference 3.45 (95% confidence interval 2.16 to 4.75), adjusted). More participants in the spironolactone group reported acne improvement than in the placebo group: no significant difference was reported at week 12 (72% v 68%, odds ratio 1.16 (95% confidence interval 0.70 to 1.91)) but significant difference was noted at week 24 (82% v 63%, 2.72 (1.50 to 4.93)). Treatment success (IGA classified) at week 12 was 31 (19%) of 168 given spironolactone and nine (6%) of 160 given placebo (5.18 (2.18 to 12.28)). Adverse reactions were slightly more common in the spironolactone group with more headaches reported (20% v 12%; p=0.02). No serious adverse reactions were reported. Conclusions Spironolactone improved outcomes compared with placebo, with greater differences at week 24 than week 12. Spironolactone is a useful alternative to oral antibiotics for women with acne. Trial registration ISRCTN12892056

Barriers and Facilitators Affecting Long-Term Antibiotic Prescriptions for Acne Treatment

“…Developing high-quality evidence on the relationship between long-term antibiotic use for acne and antibiotic resistance is urgently needed . Development of comparative effectiveness studies and dissemination of current evidence on topical regimens and oral spironolactone as feasible alternatives to long-term antibiotic use in an active, relevant, accessible, and actionable manner are needed to support clinical decision-making and antibiotic stewardship efforts.…”

The Microbiome and Acne: Perspectives for Treatment

“…Published results from a pragmatic, multicenter, phase 3, randomized controlled, double-blind trial [ 81 ]…”

Dermatological considerations for transgender and gender diverse patients: An Australian perspective

“…Dermatologists should prescribe and manage spironolactone treatment in partnership with gender care providers to balance optimal dosages for both acne and gender affirmation while minimising adverse effects 41 . Adverse effects of spironolactone include polyuria, diarrhoea, dizziness, breast enlargement and tenderness, headache and nausea 59 . Access to safe restrooms may be of concern due to increased urinary frequency.…”