title: Proton pump inhibitors and histamine-2 receptor antagonists are associated with hip fractures among at-risk patients.
abstract: OBJECTIVE
  Drugs that inhibit gastric acid might increase the risk of hip fracture. However, little long-term exposure data exist and no large studies have been conducted in the United States.
  
  
  METHODS
  We conducted a case-control study using data from an integrated health services organization. We evaluated 33,752 patients with incident diagnoses of hip/femur fractures (cases), 130,471 matched members without fractures (controls), prescription data for use of proton pump inhibitors (PPIs) or histamine-2 receptor antagonists (H2RAs) (up to 10 years' cumulative duration), and confounders.
  
  
  RESULTS
  Patients with hip fractures were more likely than controls to have previously received a > or =2-year supply of PPIs (odds ratio [OR], 1.30; 95% confidence interval [CI], 1.21-1.39) or H2RAs (OR, 1.18; 95% CI, 1.08-1.29). The risk was reduced after discontinuation of medication (OR of 1.30 [95% CI, 1.21-1.41] for current PPI users vs OR of 1.09 [95% CI, 0.64-1.85] for patients who received their last prescription 2-2.9 years ago). Higher dosages (but not increasing cumulative durations) were associated with increased risk (eg, > or =1.5 pills/day: OR, 1.41 [95% CI, 1.21-1.64]; <0.74 pills/day: OR, 1.12 [95% CI, 0.94-1.33]). Excess fracture risk for PPI use was only present among persons with at least one other fracture risk factor.
  
  
  CONCLUSIONS
  Use of drugs that inhibit gastric acid is associated with an increased risk of hip fracture; however, this association was only found among persons with at least one other risk factor for hip fracture. Acid inhibition might therefore be associated with fracture risk in persons already at risk for osteoporosis, although other confounding cannot be excluded.
authors.affiliation: Kaiser Permanente Division of Research, Oakland, California 94612, USA. douglas.corley@kp.org
authors.forename: Douglas A
authors.initials: DA
authors.lastname: Corley
authors.forename: Ai
authors.initials: A
authors.lastname: Kubo
authors.forename: Wei
authors.initials: W
authors.lastname: Zhao
authors.forename: Charles
authors.initials: C
authors.lastname: Quesenberry
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D004305:Dose-Response Relationship, Drug; D005260:Female; D005744:Gastric Acid / Q000378:metabolism; D006620:Hip Fractures / Q000139:chemically induced* / Q000453:epidemiology; D006635:Histamine H2 Antagonists / Q000009:adverse effects*; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D054328:Proton Pump Inhibitors / Q000009:adverse effects*; D012307:Risk Factors
chemical_list: D006635:Histamine H2 Antagonists; D054328:Proton Pump Inhibitors