THE ROLE OF PROTON PUMP INHIBITORS IN THE TREATMENT OF GASTROESOPHAGEAL REFLUX DISEASE

Efficacy (healing, symptom relief) and cost-effectiveness are the principal reasons for the rapidly increasing use of proton pump inhibitors (PPIs) for the management of gastro-oesophageal reflux disease. Efficacy: Mean healing rates pooled from clinical trials are as follows: on omeprazole (OME) 20 mg vs. H-2-receptor antagonist, H(2)RA (cimetidine (CIM) 1.6 g or ranitidine (RAN) 300 mg) (eight studies) at 4 weeks, 67% vs. 37%; at 8 weeks, 81% vs. 49%; on lansoprazole (LAN) 30 mg vs. H(2)RA (three studies), 83% vs. 47% and 91% vs. 63% at 4 and 8 weeks, respectively. The benefit is greatest in severe disease because the H(2)RAs are disproportionately less effective. Heartburn is more rapidly relieved and in a higher proportion: at 4 weeks, on OME 20 mg vs. H(2)RA, 77% vs. 47% and on LAN 30 mg vs. H(2)RA, 81% vs. 46%. Both PPIs are effective in H(2)RA-refractory disease, approximately 80% healing occurring in 8 weeks. Relapse rates after healing vary from 25% to 85% at 6 months. Maintenance therapy sustains remissions: relapse at 1 year is, on OME 20 mg vs. RAN 300 mg (2 studies), 12% vs. 79%, and 28% vs. 55% (and 38% on OME 10 mg); on LAN 30 mg vs. 10 mg vs. RAN 600 mg, 20% vs. 31% vs. 68%. The effectiveness of the lower dose allows for dose titration. Cost effectiveness: The higher drug costs for the PPIs are offset by their higher efficacy, making their use cost effective, particularly in severe disease. Efficacy and cost effectiveness are likely to further expand the use of PPIs at the expense of H(2)RAs as increasing numbers of patients with milder disease are treated.