CLINICAL TRIAL / NCT01280825

Inclusion Criteria: - Receiving ongoing, out-patient care at the University of Chicago Medical Center under the routine care of a physician participating in this trial - Life expectancy of at least 3 years - Must be 18 years or older - Must be taking at least 1 (but not more than 6) prescription medications at the time of enrollment OR be 65 years or older OR be reasonably expected to require the use of a prescription medication within the next 5 years - Patients with certain diseases, or likely to receive or be receiving certain drugs, will be targeted particularly for enrollment in order to enrich the study for patients likely to have pharmacogenetically relevant interactions, including, but not limited to: - Patients requiring specialized cardiology care - Patients with inflammatory bowel diseases - Patients with systemic autoimmune or inflammatory diseases - Patients requiring long-term oral anticoagulation - Patients with hepatitis C - Patients with non-metastatic cancer Exclusion Criteria: - Patients with acute or chronic disease which could be reasonably expected to result in the patient's death within the next 3 years. - Patients who have undergone, or are being actively considered for, liver or kidney transplantation. - Inability to understand and give informed consent to participate.