Pharmacogenetic Panel to Prevent Adverse Drug Reactions in Daily Primary Care Practice: (PREPARE-Mayo)

October 10, 2025 updated by: Isa J. Houwink, Mayo Clinic

A Multi-gene Pharmacogenetic Panel to Prevent Adverse Drug Reactions in Daily Primary Care Practice: Open-label, Mayo Clinic Multisite (Mayo Clinic Health System-Rochester Primary Care), Controlled, Implementation Study Taking the Results of the PREPARE Study Into Minnesota (PREPARE-Mayo)

The purpose of this study is to determine whether the implementation of pre-emptive pharmacogenomic (PGx) testing of a panel of clinically relevant PGx markers, to guide the dose and drug selection for 39 commonly prescribed drugs, will result in an overall reduction in the number of clinically relevant drug-genotype associated ADRs which are causally related to the initial drug of inclusion (referred to as 'index drug').

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
66

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

Yes

Description

Inclusion Criteria:

  • Inclusion Criteria:

In order to be eligible to participate in this study, a subject must meet all of the following criteria:

  1. Subject must be ≥ 18 years old
  2. Subject must receive a 1st prescription (meaning no known prescription for this drug in the preceding 12 months) for a drug included in Table 1, which is prescribed to them in routine primary care.
  3. Subject is able and willing to take part and willing to be followed up on for 48 weeks
  4. Subject is able to donate saliva
  5. Subject has signed informed consent
  6. Subject meets requirement for computer access implying computer literacy as measured by active use of the patient portal or their email

Exclusion Criteria:

  1. For the investigational arm only: Previous (direct-to-consumer, or clinical) pharmacogenomic testing that includes any of the genes included in the Focused Pharmacogenomics Panel
  2. Pregnant or lactating (to be verbally confirmed with the patient)
  3. Life expectancy estimated to be less than three months as determined by patient receiving hospice care
  4. Duration of index drug total treatment length is planned to be less than seven consecutive days.
  5. Current inpatients
  6. Unable to consent to the study
  7. Unwilling to take part
  8. Subject has no permanent address
  9. Subject has no current primary care provider
  10. Subject is, in the opinion of the study coordinator after discussion with participating clinician/pharmacist/investigator, not suitable to participate in the study
  11. Patient has a diagnosis of stage 4 or 5 chronic kidney disease (CKD) or is receiving dialysis
  12. Patients with advanced liver failure (stage Child-Pugh C) or a diagnosis of liver cirrhosis
  13. History of a liver transplant or an allogeneic hematopoietic stem cell transplant
  14. DNA sample collected that requires retesting in the event that DNA collected was not sufficient for testing as determined by the laboratory

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: PGx testing arm
Diagnostic test: PGx panel test
In this prospective, non-randomized, step-wedge design controlled clinical study (PREPARE-MAYO Rochester, Mayo Clinic Health System), pre-emptive genotyping of a panel of clinically relevant PGx-markers, for which CPIC guidelines are available.
Placebo Comparator: Delayed PGx testing arm
Diagnostic test: PGx panel test
In this prospective, non-randomized, step-wedge design controlled clinical study (PREPARE-MAYO Rochester, Mayo Clinic Health System), pre-emptive genotyping of a panel of clinically relevant PGx-markers, for which CPIC guidelines are available.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Adverse Drug Reaction (ADR)
Time Frame: 48 weeks
The count of participants who experience any of the following ADR's: muscle aches, falling, tripping, fainting, palpations, emotional changes, or physical changes
48 weeks

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
PREPARE-MAYO Clinicians' and pharmacists' Questionnaire.
Time Frame: 48 weeks
The 29-item PREPARE-MAYO Clinicians' and pharmacists' Questionnaire measures the Experience and Attitude, Knowledge, Knowledge testing and Needs assessment of clinicians and pharmacists. Each item is scored from 1 (disagree) to 4 (agree). Total possible scores range from 29 to 116, with lower scores indicating less knowledge and higher scores indicating more knowledge.
48 weeks
Patient-Reported Outcomes Measurement Information System (PROMIS-10) Global Health Questionnaire
Time Frame: 48 weeks
The 10-item PROMIS Global Health measures general, physical, mental and social health. Each item is scored from 1 (poor health) to 5 (excellent health). Total possible scores range from 10 to 50, with lower scores indicating worse state of health and higher scores indicating greater state of health.
48 weeks

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Mayo Clinic

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Isa Houwink, M.D., Ph.D., Mayo Clinic

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

Helpful Links

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
December 1, 2024

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 1, 2026

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
April 1, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
February 9, 2024

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
March 13, 2024

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
March 21, 2024

Study Record Updates

Last Update Posted (Estimated)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
October 14, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 10, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
October 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 23-008706

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

Deidentified individual data that supports the results will be shared beginniing 9 to 36 months following publication provided the investigator who proposes the use of the data has approval from an Institutional Review Board (IRB), Independent Ethics Committee (IEC), or Research Ethics Board (REB), as applicable, and executes a data sharing use /sharing agreement with Mayo Clinic and the PI.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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