Expertise in
4
conditions

Dr. Douglas T. Johnston

Pediatric Gastroenterology
200 Patewood Drive, Suite A140, 
Greenville, SC 
On Staff At
Accepting New Patients
Offers Telehealth
Expertise in
4
conditions
200 Patewood Drive, Suite A140, 
Greenville, SC 

Overview

Douglas Johnston is a Pediatric Gastroenterologist in Greenville, South Carolina. Dr. Johnston is highly rated in 4 conditions, according to our data. His top areas of expertise are Hereditary Angioedema, Angioedema, Hives, Eosinophilic Esophagitis, and Hormone Replacement Therapy (HRT). Dr. Johnston is currently accepting new patients.

His clinical research consists of co-authoring 29 peer reviewed articles and participating in 6 clinical trials. MediFind looks at clinical research from the past 15 years.

Specialties

Pediatric Gastroenterology

Licenses

Allergy & Immunology in NC

Languages Spoken

English

Gender

Male

Insurance

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

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Accepted insurance plans:

Absolute Total Care South Carolina
  • HMO
  • MANAGED MEDICAID PLAN
  • MEDICARE-MEDICAID PLAN
Aetna
  • EPO
  • HMO
  • POS
  • PPO
Blue Cross Blue Shield
  • EPO
  • HMO
  • POS
  • PPO
Cigna
  • EPO
  • HMO
  • PPO
Humana
  • HMO
  • INDEMNITY
  • POS
  • PPO
Independent Health
  • EPO
  • POS
  • PPO
Medicaid
  • OTHER MEDICAID
  • STATE MEDICAID
UnitedHealthcare
  • EPO
  • HMO
  • POS
  • PPO
View 3 Less Insurance Carriers -

Locations

Prisma Health Pediatric Gastroenterology – Greenville
200 Patewood Drive, Suite A140, Greenville, SC 29615

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.

6 Clinical Trials

A Phase 3, Multicenter, Open-label Continuation Study With Budesonide Oral Suspension (BOS) for Adolescent and Adult Subjects With Eosinophilic Esophagitis (EoE)
A Phase 3, Multicenter, Open-label Continuation Study With Budesonide Oral Suspension (BOS) for Adolescent and Adult Subjects With Eosinophilic Esophagitis (EoE)
Enrollment Status: Terminated
Publish Date: February 19, 2025
Intervention Type: Drug
Study Drug: Budesonide oral suspension
Study Phase: Phase 3
A Phase 3, Multicenter, Double-blind Extension Study to Evaluate Maintenance of Efficacy of Oral Budesonide Suspension (OBS) and Long-term Treatment Effect of OBS in Adolescent and Adult Subjects (11 to 55 Years of Age, Inclusive) With Eosinophilic Esophagitis (EoE)
A Phase 3, Multicenter, Double-blind Extension Study to Evaluate Maintenance of Efficacy of Oral Budesonide Suspension (OBS) and Long-term Treatment Effect of OBS in Adolescent and Adult Subjects (11 to 55 Years of Age, Inclusive) With Eosinophilic Esophagitis (EoE)
Enrollment Status: Completed
Publish Date: February 19, 2025
Intervention Type: Drug
Study Phase: Phase 3
Oral Budesonide Suspension (OBS) in Adolescent and Adult Subjects (11 to 55 Years of Age, Inclusive) With Eosinophilic Esophagitis: A Phase 3 Randomized, Double-blind, Placebo-controlled Study
Oral Budesonide Suspension (OBS) in Adolescent and Adult Subjects (11 to 55 Years of Age, Inclusive) With Eosinophilic Esophagitis: A Phase 3 Randomized, Double-blind, Placebo-controlled Study
Enrollment Status: Completed
Publish Date: February 19, 2025
Intervention Type: Drug
Study Phase: Phase 3
Expanded Access Program: Lanadelumab for the Prevention of Acute Attacks of Hereditary Angioedema (HAE) in Pediatric Patients 2 to <12 Years of Age and Lanadelumab for the Prevention Against Acute Attacks of Non-histaminergic Angioedema With Normal C1-Inhibitor (C1-INH)
Expanded Access Program: Lanadelumab for the Prevention of Acute Attacks of Hereditary Angioedema (HAE) in Pediatric Patients 2 to <12 Years of Age and Lanadelumab for the Prevention Against Acute Attacks of Non-histaminergic Angioedema With Normal C1-Inhibitor (C1-INH)
Enrollment Status: No_longer_available
Publish Date: July 24, 2023
Intervention Type: Drug
An Observational, Non-interventional, Study of Patients With Hereditary Angioedema in the United States and Canada (EMPOWER Study)
An Observational, Non-interventional, Study of Patients With Hereditary Angioedema in the United States and Canada (EMPOWER Study)
Enrollment Status: Completed
Publish Date: March 30, 2023
SPRING STUDY: An Open-Label, Multicenter, Phase 3 Study to Evaluate the Safety, Pharmacokinetics, and Pharmacodynamics of Lanadelumab for Prevention Against Acute Attacks of Hereditary Angioedema (HAE) in Pediatric Subjects 2 to <12 Years of Age
SPRING STUDY: An Open-Label, Multicenter, Phase 3 Study to Evaluate the Safety, Pharmacokinetics, and Pharmacodynamics of Lanadelumab for Prevention Against Acute Attacks of Hereditary Angioedema (HAE) in Pediatric Subjects 2 to <12 Years of Age
Enrollment Status: Completed
Publish Date: May 26, 2022
Intervention Type: Drug
Study Drug: Lanadelumab
Study Phase: Phase 3
View 5 Less Clinical Trials

29 Total Publications

Oral berotralstat for hereditary angioedema prophylaxis in patients aged 2 to <12 years: APeX-P interim results.
Oral berotralstat for hereditary angioedema prophylaxis in patients aged 2 to <12 years: APeX-P interim results.
Journal: Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology
Published: June 03, 2025
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Frequently Asked Questions about Dr. Douglas T. Johnston

How do I make an appointment with Dr. Douglas T. Johnston?

You can book an appointment with Dr. Douglas T. Johnston by calling their office at 864-454-5125. MediFind provides direct contact information so you can schedule visits, second opinions, or consultations without navigating third-party calendars.

Is Dr. Douglas T. Johnston a top-rated expert for Hereditary Angioedema?

MediFind is an objective health platform that identifies experts based on real-world data. Dr. Douglas T. Johnston is classified as an Elite expert for Hereditary Angioedema, meaning they are among the top experts in the country for this condition. This ranking is based on their volume of patients, published research, and peer connections.

What conditions does Dr. Douglas T. Johnston specialize in?

While Dr. Douglas T. Johnston is a Pediatric Gastroenterology, they have specific expertise in Hereditary Angioedema, Angioedema, and Hives. MediFind analyzes a doctor's articles and referral patterns to identify their specific areas of focus within Pediatric Gastroenterology.

Does Dr. Douglas T. Johnston participate in research or clinical trials?

Yes. Dr. Douglas T. Johnston has published 29 articles and abstracts on conditions like Hereditary Angioedema. You can view a list of Dr. Douglas T. Johnston's latest peer-reviewed publications and clinical trial participation on their profile to see if they are active in new treatments.

Does Dr. Douglas T. Johnston accept my insurance?

Dr. Douglas T. Johnston accepts most major insurance plans, including Absolute Total Care South Carolina and Aetna. We recommend calling the office directly at 864-454-5125 to verify that your specific plan is currently accepted before your visit.

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

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