title: Variability in individual response to various doses of omeprazole. Implications for antiulcer therapy.
abstract: This study was carried out in order to perform a combined prospective assessment of the individual pharmacodynamic response and of duodenal ulcer healing in patients treated with three different doses of omeprazole. Ninety-nine patients with endoscopically proven duodenal ulcers were subdivided into three parallel groups of 33 cases, who were randomly assigned to receive orally at 0800 hr, in single blind fashion, either 10 mg, 20 mg, or 40 mg of omeprazole. All of them underwent continuous intragastric pH monitoring both in basal conditions and on the fifth day of each dose regimen; ulcer healing was then assessed endoscopically after four weeks of treatment. All three doses of omeprazole caused pH values to increase significantly (P < 0.001) over the whole 24-hr period. In patients treated with omeprazole 10 mg, the individual responses showed the highest variability: the acid inhibition, expressed in terms of time spent above pH 3.0, lasted for more than 16 hr in 42% of cases, for more than 8 hr in 28%, and for less than 6 hr in 30%. In patients treated with omeprazole 20 mg, the pharmacological response was more marked and uniform and lasted for more than 16 hr in 79% of cases; however, it is worth noting it lasted for less than 6 hr in three patients (10%). In patients treated with omeprazole 40 mg, the individual response was excellent (more than 16 hr) in 94% of cases, and it lasted for less than 6 hr in only one patient (3%).(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Dipartimento di Medicina Interna, Università di Genova, Italy.
authors.forename: V
authors.initials: V
authors.lastname: Savarino
authors.forename: G S
authors.initials: GS
authors.lastname: Mela
authors.forename: P
authors.initials: P
authors.lastname: Zentilin
authors.forename: P
authors.initials: P
authors.lastname: Cutela
authors.forename: M R
authors.initials: MR
authors.lastname: Mele
authors.forename: S
authors.initials: S
authors.lastname: Vigneri
authors.forename: G
authors.initials: G
authors.lastname: Celle
mesh_terms: D004305:Dose-Response Relationship, Drug; D004381:Duodenal Ulcer / Q000188:drug therapy*; D005260:Female; D005744:Gastric Acid / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods; D009853:Omeprazole / Q000008:administration & dosage* / Q000627:therapeutic use; D016037:Single-Blind Method; D013997:Time Factors; D014945:Wound Healing / Q000187:drug effects
chemical_list: D009853:Omeprazole