what about pessaries

The short version: pessaries are a delivery method, not a treatment, and the evidence here does not test whether boric acid pessaries beat oral fluconazole or placebo for recurrent thrush.

A pessary is just a solid dose form that dissolves in the vagina. The question is what is in it. The evidence here covers boric acid 600 mg vaginal pessaries, nystatin pessaries, and clotrimazole pessaries. None of the studies compare one pessary type against another in a head-to-head trial for recurrent thrush.

For boric acid pessaries, the 2003 study reports a 64% success rate against Candida glabrata in one clinic [1]. A 2005 review lists 600 mg vaginally daily as an option for azole-resistant non-albicans species but says long-term safety is not confirmed [3]. The 2025 study on bacterial vaginosis used boric acid pessaries for 14 days and found symptom improvement, but it had no control group and only 30-day follow-up [2]. That study is about bacterial vaginosis, not thrush.

For nystatin pessaries, a 2014 study compared vaginal nystatin to oral fluconazole in recurrent thrush. Nystatin cured 78% initially and 81% at 6 months, while fluconazole cured 74% initially and 73% at 6 months [5]. The key difference: nystatin cured 64% of C. glabrata cases, while fluconazole cured only 12.5% [5]. That is a meaningful difference for non-albicans species.

For clotrimazole pessaries, the evidence here is thin. A 2009 case report mentions two clotrimazole pessaries as part of a regimen [4]. A 2012 study tested clotrimazole against Candida strains from pregnant women and found 90-98% susceptibility [3], but that is lab data, not clinical outcomes.

The missing piece is the same as before: you need a culture that identifies the Candida species and its antifungal sensitivities. Without that, you cannot know which pessary matches your infection. Boric acid and nystatin both work against C. glabrata when fluconazole does not [1, 5]. But no study here proves any pessary works better than oral fluconazole for C. albicans thrush.

My call: pessaries are a reasonable delivery method, but the choice depends on the Candida species, and the evidence here does not include a single randomized trial comparing one pessary type against another for recurrent thrush. Confidence: low.