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Daniel Tomaszewski, PharmD, PhD - USC School of Pharmacy. Los Angeles, CA, US

Daniel Tomaszewski, PharmD, PhD Daniel Tomaszewski, PharmD, PhD

Associate Professor of Pharmaceutical and Health Economics | USC School of Pharmacy


An expert in drug pricing/policy, managed care, pharmacy benefit management, opioid use in pediatrics, and medication adherence.





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Pharmacist Overrides Doctor's Prescription?


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Daniel Tomaszewski completed both his Pharm.D. and Ph.D. at the University of Minnesota - College of Pharmacy. Prior to joining the USC School of Pharmacy faculty, he had been an Assistant Professor of Pharmacy Administration at Chapman University since 2014. Dr. Tomaszewski's expertise includes working directly with payors and healthcare decision makers to optimize medication use and ensure cost effective implementation of pharmacy and health benefits. In addition, Dr. Tomaszewski has taught a wide variety of courses within doctorate of pharmacy and graduate programs with a focus on managed care and global perspectives on medication use within the U.S. healthcare system. With experience in managed care, pharmacy practice, and academia, Dr. Tomaszewski offers a unique perspective as an instructor, researcher, and pharmacist.

Areas of Expertise (6)

Drug pricing

Health Care Policy

Medication Safety


Medication Adherence

Managed Care

Accomplishments (3)

University of Minnesota Alumni Association Mentor of the Year (professional)


Minnesota Pharmacist License (professional)

2009 - present

Wisconsin Pharmacist License (professional)

2009 - present

Education (2)

University of Minnesota: PhD, Social and Administrative Pharmacy

University of Minnesota: PharmD

Affiliations (3)

  • Member - Vice Chair: Academy of Managed Care Pharmacy, 2018 - present
  • Member: California Pharmacist Association, 2014 - present
  • Member: American Pharmacist Association, 2007 - present

Selected Event Appearances (5)

The Impact of Federal Healthcare Reform on Patient Care

Western Pharmacy Exchange Annual Meeting, California Pharmacists Association - 2018  

The U.S. Healthcare System: How Pharmacy Benefit Managers Impact Prescription Drug Use

Osher Lifelong Learning Institute - 2018  

The role of pharmacists in the healthcare system post Affordable Care Act & the pharmacist’s role in political engagement

California Pharmacists Association (CPhA) Annual Meeting - 2014  

State and Federal Legislative Update

Academy of Managed Care Pharmacy Annual Meeting - 2013  

AMCP Partnership Forum

Recommendations to Modernize the Specialty Medication Benefit  

Research Grants (3)

Evaluating the Use of Prescription Opioids Among Adolescents and Young Adults for Non-Cancer and Cancer-Related Pain

Kay Family Foundation 

2017 - 2019 Role: Primary Investigator

Evaluating Gender Differences in Prescription Opioid Medication Use

Kay Family Foundation 

2017 - 2019 Role: Consultant

Chapman University Office of Research Seed Funding

Inclusion of Biosimilar Education Within Schools of Pharmacy and Medicine Curricula 

2017 Role: Primary Investigator

Selected Articles (5)

National gender differences in the prescribing of opioid medications from 2006 to 2015

Journal of Opioid Management

2020 Retrospective analysis of data from The National Ambulatory Medical Care Survey from January 1, 2006 to December 31, 2015. Eligible patients were at least 18 years old on the date of the physician office visit. Data were collected on patient demographics and clinical factors. Data were analyzed using bivariate and multivariate logistic regression models to explore differences in opioid prescribing among men and women. Due to the large sample size, the significance level was set to p < 0.001.

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Exploring the Relationship of Digital Information Sources and Medication Adherence

Computers in Biology and Medicine

2019 We present a retrospective analysis of data collected in the United States from the 2015 National Consumer Survey on the Medication Experience and Pharmacists' Role in order to model the relationship between health information sources and medication adherence and perception. Our results indicate that while the digital age has presented prescription users with many non-traditional alternatives for health information, the use of digital content has a significant negative correlation with pharmaceutical adherence and attitudes toward medication.

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Trends in Opioid Use in Pediatric Patients in US Emergency Departments From 2006 to 2015

The Journal of the American Medical Association

2018 The use of opioids to treat pain in pediatric patients has been viewed as necessary; however, this practice has raised concerns regarding opioid abuse and the effects of opioid use. To effectively adjust policy regarding opioids in the pediatric population, prescribing patterns must be better understood.

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Evaluating Factors Impacting Medication Adherence Among Rural, Urban, and Suburban Populations

The Journal of Rural Health

2018 This is a retrospective analysis of the 2015 National Consumer Survey on the Medication Experience and Pharmacists' Role. A total of 26,173 participants completed the survey and provided usable data. Participants using between 1 and 30 prescription medications and living more than 0 miles and up to 200 miles from their nearest pharmacy were selected for the study, resulting in a total of 15,933 participants.

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Relationship Between Self-Efficacy and Patient Knowledge on Adherence to Oral Contraceptives Using the Morisky Medication Adherence Scale (MMAS-8)

Reproductive Health

2017 Preconception care, including family planning, is a vital component of healthcare for women of reproductive age. An average female spends the majority of her reproductive life trying to prevent a pregnancy. In order to prevent unintended pregnancy, women often rely on the use of hormonal contraceptives.

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