Data Analysis for Drug Repurposing for Effective Alzheimer's Medicines (DREAM)- Pentoxifylline Versus Cilostazol

Please see https://docs.google.com/spreadsheets/d/17QJ294pffmOCFYLeq0eSvn7hlj6MOb-0dJCr1RL3kfk/edit?usp=sharing or Appendix A (https://drive.google.com/drive/folders/1-lR6dR\_aP44GoryjCad\_NwRhjPpsIKDU?usp=sharing) 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 peripheral artery disease diagnosis measured 365 days prior to drug initiation Exclusion Criteria: * 1\. Prior history of dementia measured anytime prior to cohort entry date * 2\. Prior history of nursing home admission in the 365 days prior to the cohort entry date * 3\. Prior history of Pentoxifylline or Cilostazol use anytime prior to cohort entry date