Omeprazole is more effective than cimetidine for the relief of all grades of gastro‐oesophageal reflux disease‐associated heartburn, irrespective of the presence or absence of endoscopic oesophagitis

Background : Previous studies have demonstrated greater efficacy for omeprazole compared with cimetidine in patients with endoscopically verified oesophagitis, but excluded the substantial group of gastro‐oesophageal reflux disease (GERD) patients with reflux symptoms but without endoscopic abnormality. This prospective, randomized, double‐blind study compared omeprazole and cimetidine in the treatment of GERD‐associated heartburn both in patients with symptomatic non‐ulcerative oesophagitis and in those with heartburn but without oesophagitis. Methods : A total of 221 patients with heartburn and oesophageal mucosa grade 0 (normal, n = 51), 1 (no macroscopic erosions, n = 52), 2 (isolated erosions, n = 97) or 3 (confluent erosions, n = 21) were randomized to receive double‐blind either omeprazole 20 mg daily or cimetidine 400 mg q.d.s. for a period of 4 weeks. Those still symptomatic after 4 weeks of treatment received omeprazole 20 mg daily for a further 4 weeks. Results : There was no correlation between severity of heartburn and endoscopic grade at entry (correlation coefficient = 0.196). After 4 weeks of treatment, the proportion of patients in whom heartburn was controlled (no more than mild symptoms on no more than 1 day in the previous 7) on omeprazole (66%; 74/112) was more than double that on cimetidine (31%; 34/109) ( P < 0.0001). There was no significant difference between the relief of heartburn in the 47% of patients without unequivocal oesophagitis (endoscopic grade 0 or 1) and in the 53% of patients with erosive oesophagitis (grade 2 or 3) ( P = 0.31). Only treatment with omeprazole ( P < 0.0001) and lower severity of heartburn at entry ( P < 0.01) were significant in predicting heartburn relief. Amongst those patients requiring an additional 4 weeks of treatment with omeprazole, 67% (54/81) reported that their heartburn was controlled after 8 weeks of treatment. Conclusion : We conclude that omeprazole is superior to cimetidine for the relief of all grades of heartburn in GERD, whether or not the patient has unequivocal endoscopic oesophagitis.