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Dimethicone is a common additive to antacids, although its value in the treatment of reflux oesophagitis is unproven. Its efficacy was assessed by comparing the effect of a dimethicone-containing antacid gel (Asilone Gel) with a simple antacid gel in a double-blind trial in 45 patients with reflux oesophagitis. Thirty-eight patients completed the eight-week course of therapy. Antacid therapy alone resulted in a significant improvement of both symptoms and oesophagitis in gastro-oesophageal reflux. The inclusion of dimethicone in the antacid gel preparation did not confer any benefit in terms of symptomatic assessment but did confer a small advantage with regard to objective markers of oesophageal inflammation, suggesting that a dimethicone-containing antacid is of value in the treatment of symptomatic gastro-oesophageal reflux.