Among patients with the CYP2C19 PM phenotype , sufficient , sustained reflux symptom relief was higher with omeprazole than with rabeprazole on days 4-7 ( 62.5-66 .9 vs. 31.6 % ; p 0.03 ) ; differences were not significant on days 1-3 , or among those with the homoEM or heteroEM phenotypes on days 1-7 .