Distinguished in Hives

Dr. Douglas T. Johnston

Pediatric Gastroenterology
Prisma Health
Prisma Health Pediatric Gastroenterology – Greenville
200 Patewood Drive, Suite A140, 
Greenville, SC 
On Staff At
Accepting New Patients
Offers Telehealth
Distinguished in Hives
Prisma Health
Prisma Health Pediatric Gastroenterology – Greenville
200 Patewood Drive, Suite A140, 
Greenville, SC 
OverviewInsuranceLocationsClinical Research

Overview

Douglas Johnston is a Pediatric Gastroenterologist in Greenville, South Carolina. Dr. Johnston is rated as a Distinguished provider by MediFind in the treatment of Hives. 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 31 peer reviewed articles and participating in 6 clinical trials. MediFind looks at clinical research from the past 15 years. In particular, he has co-authored 25 articles and participated in 3 clinical trials in the study of Hives.

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
Call: 864-454-5125

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

31 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
View All 31 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. Johnston's expertise for a condition
ConditionClose
  • Elite
  • Angioedema
    Dr. Johnston is
    Elite
    . Learn about Angioedema.
    See more Angioedema experts
  • Hereditary Angioedema
    Dr. Johnston is
    Elite
    . Learn about Hereditary Angioedema.
    See more Hereditary Angioedema experts
  • Distinguished
  • Hives
    Dr. Johnston is
    Distinguished
    . Learn about Hives.
    See more Hives experts
  • Advanced
  • Eosinophilic Esophagitis
    Dr. Johnston is
    Advanced
    . Learn about Eosinophilic Esophagitis.
    See more Eosinophilic Esophagitis experts
  • Experienced
  • Allergic Rhinitis
    Dr. Johnston is
    Experienced
    . Learn about Allergic Rhinitis.
    See more Allergic Rhinitis experts
  • Asthma
    Dr. Johnston is
    Experienced
    . Learn about Asthma.
    See more Asthma experts
  • Complement Component 2 Deficiency
    Dr. Johnston is
    Experienced
    . Learn about Complement Component 2 Deficiency.
    See more Complement Component 2 Deficiency experts
  • Eosinophilic Enteropathy
    Dr. Johnston is
    Experienced
    . Learn about Eosinophilic Enteropathy.
    See more Eosinophilic Enteropathy experts
  • Grass Allergy
    Dr. Johnston is
    Experienced
    . Learn about Grass Allergy.
    See more Grass Allergy experts
  • Hormone Replacement Therapy (HRT)
    Dr. Johnston is
    Experienced
    . Learn about Hormone Replacement Therapy (HRT).
    See more Hormone Replacement Therapy (HRT) experts
View All 9 Experienced Conditions
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