Charles W. Flexner
Distinguished in HIV/AIDS

Dr. Charles W. Flexner

Pharmacology
Johns Hopkins Medicine
The Johns Hopkins Hospital
1800 Orleans Street, 
Baltimore, MD 
40 Years of Experience

Distinguished in HIV/AIDS
Johns Hopkins Medicine
The Johns Hopkins Hospital
1800 Orleans Street, 
Baltimore, MD 
OverviewInsuranceLocationsClinical Research

Overview

Charles W. Flexner, M.D., is Professor of Medicine in the Divisions of Clinical Pharmacology and Infectious Diseases, and Professor of Pharmacology and Molecular Sciences in the Johns Hopkins University School of Medicine. He is also Professor of International Health in the Johns Hopkins University Bloomberg School of Public Health. Dr. Flexner is an expert on the basic and clinical pharmacology of drugs for HIV/AIDS and related infections, including viral hepatitis and tuberculosis. His scientific contributions include work on the important roles of pharmacokinetic enhancement, adherence, and dosing frequency in the long-term management of HIV/AIDS. He has published extensively on anti-infective drug transport and metabolism, and metabolic drug interactions. Dr. Flexner is currently the Chief Scientific Officer of the Institute for Clinical and Translational Research at Johns Hopkins. He also serves as Associate Vice-Chair for Academic Fellowship Programs in the Department of Medicine, and Associate Director of the Graduate Training Programs in Clinical Investigation of the Johns Hopkins University School of Medicine and Bloomberg School of Public Health. Dr. Flexner is the Principal Investigator of the Long-Acting Extended Release Antiretroviral Research Resource Program (LEAP), and Co-Principal Investigator of the Johns Hopkins University AIDS Clinical Trials Unit (ACTU) supported by the NIH. He served as President of the American Federation for Medical Research (AFMR) in 1999-2000, and was President of the AFMR Foundation from 2001-2002. He is a member of the editorial board of 10 scientific journals. He currently serves as a consultant to the Bill and Melinda Gates Foundation and the Clinton Health Access Initiative, and served as a consultant on FDA reform to the United States House of Representatives.

Dr. Flexner is rated as a Distinguished provider by MediFind in the treatment of HIV/AIDS. His top areas of expertise are HIV/AIDS and Hepatitis.

His clinical research consists of co-authoring 91 peer reviewed articles and participating in 2 clinical trials. MediFind looks at clinical research from the past 15 years. In particular, he has co-authored 45 articles in the study of HIV/AIDS.

Residency
Stanford University Medicine, Internal Medicine, 1985
Specialties
Pharmacology
Licenses
Internal Medicine in MD
Board Certifications
American Board Of Internal Medicine
Fellowships
National Institutes of Health Clinical Center, 1988
Languages Spoken
English
Italian
Gender
Male

Insurance

Accepted insurance can change. Please verify directly with the provider.

Find your insurance
Find your insuranceClose

Accepted insurance plans:

Aetna
  • EPO
  • HMO
  • POS
  • PPO
CareFirst
  • HMO
  • POS
  • PPO
Cigna
  • EPO
  • HMO
  • PPO
First Health
  • INSURANCE PLAN
  • MEDICARE PDP
  • PPO
Geisinger
  • HMO
  • POS
  • PPO
Humana
  • HMO
  • INDEMNITY
  • POS
  • PPO
Independent Health
  • EPO
  • POS
  • PPO
View 2 Less Insurance Carriers -

Locations

The Johns Hopkins Hospital
1800 Orleans Street, Baltimore, MD 21287
Call: 410-955-5000

Clinical Research

Clinical research consists of overseeing clinical studies of patients undergoing new treatments and therapies, and publishing articles in peer reviewed medical journals. Providers who actively participate in clinical research are generally at the forefront of the fields and aware of the most up-to-date advances in treatments for their patients.


2 Clinical Trials

Evaluating Pharmacokinetic Interactions With Vaginal Ring Contraceptives and Antiretroviral Therapy (ART)
Evaluating Pharmacokinetic Interactions With Vaginal Ring Contraceptives and Antiretroviral Therapy (ART)
Enrollment Status: Completed
Publish Date: June 06, 2018
Intervention Type: Device, Drug
Study Phase: Phase 2
Sofosbuvir-Containing Regimens Without Interferon For Treatment of Acute HCV in HIV-1 Infected Individuals (SWIFT-C)
Sofosbuvir-Containing Regimens Without Interferon For Treatment of Acute HCV in HIV-1 Infected Individuals (SWIFT-C)
Enrollment Status: Completed
Publish Date: April 27, 2018
Intervention Type: Drug
Study Phase: Phase 1
View 1 Less Clinical Trial

91 Total Publications

The Promises and Prospects of Long-Acting Therapeutics for Treatment and Prevention of Infectious Diseases.
The Promises and Prospects of Long-Acting Therapeutics for Treatment and Prevention of Infectious Diseases.
Journal: Annual review of pharmacology and toxicology
Published: September 16, 2025
View All 91 Publications

Areas of Expertise

MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.

Learn more about MediFind’s expert tiers

Find Dr. Flexner's expertise for a condition
ConditionClose
    • Distinguished
    • HIV/AIDS
      Dr. Flexner is
      Distinguished
      . Learn about HIV/AIDS.
      See more HIV/AIDS experts
      • Experienced
      • Hepatitis
        Dr. Flexner is
        Experienced
        . Learn about Hepatitis.
        See more Hepatitis experts
      Want to save this doctor for later?
      Sign Up
      Is this your doctor?
      Find A Second Opinion
      Not sure about your diagnosis?
      Check Your Symptoms
       
       
       
       
      Learn about our expert tiers
      Learn More
      Are you the provider on this profile?
      Claim Profile
      For Patients
      • Our Story
      • How MediFind Works
      • Conditions A-Z
      • Doctor Directory
      • Symptoms Directory
      • Procedures Directory
      • Treatment Directory
      • Drug Directory
      • Infusion Center Finder
      • FAQ
      • Contact Us
      For Providers and Practices
      • Claim Your Profile
      • Newsroom
      Business Solutions
      • Provider
      • Network Solutions
      Additional Resources
      • Consumer Health Data Privacy Policy
      • Privacy Policy
      • Terms of Use
      • Advertising Policy
      • Content Policy
      Subscribe to our newsletter

      Sign up to stay informed about MediFind and get wellness sent your way.

      Close

        By subscribing, I agree to MediFind's Terms of Use, Privacy Policy and Consumer Health Data Privacy Policy, as applicable.

        Bullet PinMediFind
        Follow us on
        This information is not intended as a substitute for informed medical advice. You should work with a licensed professional to diagnose and treat health conditions. We let the data speak for itself, MediFind does not endorse any healthcare providers.
        © 2026 All Rights Reserved

        Request an Appointment

        If you are experiencing a medical emergency, call 9-1-1.

        MediFind will contact the provider for your appointment request. You’ll receive status updates by email. Your provider or MediFind will reach out to you directly by phone or email to schedule your appointment or request additional information.

        Patient Details

        This information is for the patient who will be seen at the appointment.

          Close

          Returning patient? Use your address on file with the provider.

          Insurance Details

          Please provide information of the primary insurance holder as the practice may require this information to schedule.

          Insurance Provider *
          Insurance ProviderClose

          Appointments Details

          Let’s get more information about your appointment.

                  0 / 1000
                  0 / 1000
                  By pressing the Submit button you are agreeing to MediFind’s Terms of Use, Privacy Policy and Consumer Health Data Privacy Policy, as applicable.