Abstract
Sulfasalazine (SASP) is a prodrug composed of a molecule of 5-aminosalicylic acid (5-ASA) and sulfapyridine, linked by an azo bond. When taken orally anaerobic intestinal bacteria split the azo bond, releasing the two components 5-ASA and sulfapyridine, the former being the active anti-inflammatory component. It has been reported that SASP and its metabolites therapeutically act in different points in the inflammatory cascade by decreasing eicosanoid synthesis, cytokine expression, and the activation of NF-kB transcription factor. In addition, SASP exhibit antioxidant activity.
SASP has been used in ulcerative colitis where it has been shown to be effective in both inducing remission of active disease and preventing relapse in inactive patients. However, the role of SASP in the treatment of mild or moderate Crohn’s disease is controversial still nowadays. The first solid evaluation of the effect of SASP on Crohn’s disease comes from two ancient large studies: the American National Cooperative Crohn’s Disease Study (NCCDS) and the European Cooperative Crohn’s Disease Study (ECCDS).
Two meta-analyses pooling the available data on the effect of different salicylates in mild-to-moderate active Crohn’s disease showed that SASP was marginally effective in inducing remission compared to placebo, with benefit confined mainly to patients with isolate colonic involvement. Interestingly, however, the performance of SASP was better than that of mesalazine, either at low or high dose. In contrast, mesalazine but not SASP has shown to be effective in the prevention of postoperative recurrence in Crohn’s disease.
On the light of the available evidence, both experts and consensus-based guidelines recommend the use of high-dose (3–6 g/day) SASP in Crohn’s disease only for patients with mild disease confined to the colon. Anyway, SASP should be used in the short term, and active disease beyond 16 weeks of this therapy should be considered a therapeutic failure.
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Gassull, M.A., Cabré, E. (2017). Conventional Medical Management of Crohn’s Disease: Sulfasalazine. In: Baumgart, D. (eds) Crohn's Disease and Ulcerative Colitis. Springer, Cham. https://doi.org/10.1007/978-3-319-33703-6_28
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