Please see https://docs.google.com/spreadsheets/d/1VlyY3zcxoRp0tH7yv8rSOEggSO6WQ0VYEjq-6KlSSt8/edit?usp=sharing or Appendix A for full code and algorithm definitions.  Medicare timeframe: 2008 to 2018 (end of data availability).  Inclusion Criteria:  1. Aged > 65 years on the index date 2. Enrollment in Medicare Part A, B, and D with no HMO coverage for 365 days prior to and including cohort entry date 3. At least two claims with hypertension diagnosis recorded in 365 days prior to cohort entry date  Exclusion Criteria:  1. Prior history of dementia measured anytime prior to cohort entry date 2. Prior use of dihydropyridine CCBs, hydrochlorothiazide, or other antihypertensives anytime prior to cohort entry date