age \>18 years

have been prescribed one or more antihypertensive medications

blood pressure of \>120 mmHg systolic or \>80 mmHg diastolic

substance use problem

willing to use a cell phone to record medication ingestion for three months

have a valid photo ID (driver's license, passport, state ID) and are willing to sign an off-campus property transfer form and return study equipment at the end of study participation

Improving Antihypertensive Medication Adherence

What this study is about