U.S. doctors online nowAsk doctors free

Dr. Douglas Johnston

Allergy and Immunology
Charlotte, NC
20 years experience male

Locations

Asthma & Allergy Specialists

Charlotte, NC

Address

Charlotte, NC
Directions

Practice website

About

Bio

Dr. Johnston is an Allergist/Immunologist in private practice and an assistant professor of Internal Medicine / Allergy /Immunology at the Edward Via College of Osteopathic Medicine. Dr. Johnston received his D.O. from New York College of Osteopathic Medicine in Old Westbury, New York. He completed his residency in Internal Medicine at Winthrop University Hospital in Mineola, New York, and received fellowship training in Allergy and Immunology at the University of Alabama at Birmingham. He serves on several professional committees which aim to improve the quality of care in the field of Allergy and Immunology. Dr. Johnston has been published in several journals and has an interest in Hereditary Angioedema and treatment strategies for Eosinophilic Esophagitis.

Specialties
Doctors may have more than one area of specialty interest. Board certification in a specialty area means the doctor has completed formal training and has practice experience in that specialty, and has passed the certification examination from the corresponding accredited medical specialty board.

Allergy and Immunology

Languages spoken

English

Doctor Q&A

48 Answers
21 Agrees
The number of answers this doctor has agreed with.
A 36-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
No: Phenylephrine is an oral decongestant.
A 35-year-old female asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
ER Now: Rapid breathing and retractions can be a sign of respiratory distress. These muscles can get tired and difficulty breathing can get worse. Stay calm a... Read More
A 40-year-old female asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Talk to your doctor: Nasal congestion can be difficult to treat with otc medications. Typically prescription nasal medications are more helpful for allergic nasal congesti... Read More
A 31-year-old female asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Yes: It is possible to be allergic to one type of fish, however there is high cross reactivity amount fish and i would discuss this with your doctor who ma... Read More
A 34-year-old female asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Biopsy can help: There can be stricture formation due to changes from eoe. A biopsy of the esophagus would help to determine if eoe is possible.
A 38-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Treatment of EoE: Typical treatment options include topical steroids, food elimination diets or a combination of both. Talk to your doctors to determine the best treatm... Read More
A 45-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Swelling: Angioedema is a medical term for swelling of the deep layers of the skin. Angioedema can be due to a number of different reasons and is not alway due ... Read More
A 34-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Depends on age: The symptoms of eosinophilic esophagitis depend on the age of the patients. Infants tend to have difficulty gaining weight, recurrent vomiting for fa... Read More
A 39-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Treatments for EoE: Treatment options for eosinophilic esophagitis currently include topical corticosteroids and/or food elimination diet. An allergist with experience in... Read More
A 38-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Depends on cause: The risk of severe laryngeal swelling or throat swelling depends on the cause of your hives and swelling. This risk can be high in food/ drug allergy ... Read More
A 44-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
See an allergist: No all angioedema is allergic and some forms do not response to epinephrine, steroids or antihistamines. I would recommend evaluation by an allergist ... Read More
A 35-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Depends on the cause: This depends on the cause. Most cases do not , however, food and drug allergy has potential to cause severe reactions. An accurate diagnosis is import... Read More
A 42-year-old male asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Might have to wait: Many casuse of idiopathic hives and swelling typically run a course and eventially go into remission. The goal is to controlled the disease with safe ... Read More
A 40-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Can vary: Symptoms of symptoms of anaphylaxis after insect sting can vary depending on the person and the degree sensitivity to insect venom. Severe reactions ... Read More
A 29-year-old female asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Your doctor can help: The development of pressure or fullness in the ears may be due to fluid production from sinus inflammation. This can occur in both allergic rhinitis (... Read More
A 45-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Sedation risk: There may be potential for increased sedation with Hydroxyzine and xanax (alprazolam). Hydroxyzine alone can be sedating.
A 31-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Similar: Nasonex and Flonase are both nasal steroids but the steroid in Nasonex is mometasone and the steroid in Flonase is fluticasone. Both are effective for... Read More
A 39-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
EoE: Eosinophilic esophagitis or eoe is an allergic inflammatory disease of the esophagus typically caused by food proteins. Symptoms can include vomiting,... Read More
A 29-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
EoE: Eosinophilic esophagitis or eoe is an allergic inflammatory disease of the esophagus typically caused by food proteins. Symptoms can include vomiting,... Read More
A 30-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
EoE: Eosinophilic esophagitis or eoe is an allergic inflammatory disease of the esophagus typically caused by food proteins. Symptoms can include vomiting,... Read More
A 19-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Yes: Not all swelling (angioedema) is due to allergy. While there are many causes of swelling, one is a type of swelling disorder called cold urticaria, ... Read More
A 40-year-old female asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Treatments for EoE: The current treatment options for eosinophilic esophagitis include topical steroids (fluticasone inhaler swallowed) and food elimination diet. An alle... Read More
A 44-year-old female asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Not the best test: Skin prick testing or serum specific ige blood tests are the preferred tests to determine immediate allergic sensitivity that might cause hives and sw... Read More
A 37-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Can vary: Ige mediated food allergy symptoms may include hives, swelling, vomiting, abdominal pain, difficulty breathing, and even drop in blood pressure. Sympt... Read More
A member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Could be : Hae or hereditary angioedema is a genetic swelling disease due to deficiency or dysfuntion in a protein called c1 inhibitor. Typical symptoms include ... Read More
A 32-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Learning more : A recent publication in the journal of allergy and clinical immunology described a subset of patients with eosinophilic esophagitis who have connectiv... Read More
A 29-year-old male asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Updated definition: According updated 2011 consensus recommendations, eosinophilic esophagitis is a “chronic, immune/antigen-mediated esophageal disease characterized cli... Read More
A male asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Need fresh food: Often times the food skin prick test is positive, however fresh food may be needed.
A 49-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Little is known: There have been a subset of patients with hae type iii (now called hae with normal complement) who have a mutation in a blood factor called factor xii... Read More
A 35-year-old female asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Cold urticaria: Yes it is possible to develop hives and swelling to the cold. This is not acually an "allergy" but rather an abnormal response by the body that can o... Read More
A 36-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Eval may help: There are many causes of skin swelling and not all are genetic. One condition called hereditary angioedema is a genetic type of swelling that often r... Read More
A 42-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Allergist: An allergist can help evaluate angioedema, which is deep skin swelling m.
A 48-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
No: While anaphylaxis can occur due to food and drug allergy, it does not occur in every case. It is important to discuss the cause of hives and swelling ... Read More
A 36-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
allergists can help: There been exciting and new pharmaceutical options developed for the treatment of acute attacks of hereditary angioedema. Typically board certified a... Read More
A 47-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Treatment of EoE: Current treatments for eosinophilic esophagitis include topical steroids and food elimination diet. An allergist with experience in treating eoe can h... Read More
A 34-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Allergy treatments: Typical treatment for allergic rhinitis include avoidance of allergic triggers, oral antihistamines, leukotriene modifying drugs, nasal steroids, nasa... Read More
A 40-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Start with your doc: I would take pics of swelling and discuss them with your primary doctor first to help narrow down potential causes.
A 40-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Can vary: Attack duration varies from person to person but typically lasts 3-5 days.
A 16-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
It can: When tongue swelling is severe, it can block the airway and make it very difficult to breath. There are many causes of swelling and i would recommend... Read More
A 48-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Not specifically...: Eoe has recently been associated with connective tissue disease but not specifically sjorgen's. See below http://www.Aaaai.Org/global/latest-resear... Read More
A 42-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Nasal congestion?: I would suggest talking to your doctor if otc antihistamines are not helpful. I will mention that antihistamines tend to be more helpful for itching a... Read More
A 48-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Not likely : This would not be likely. Food allergy is typically caused by food proteins and coconut oil would have significantly less coconut protein than coconut... Read More
A 37-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
No: There are no recommended tests to determine the status of the immune system. The immune system and fuction is very complex. An immunologist can help e... Read More
A 46-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Often with 2 hours : Hives or urticaria caused by exposure to allergens (such as food) typically occur rapidly, often minutes but can occur up to 2 hours later. It is impo... Read More
A 23-year-old male asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Allergic to beer?: There have been case reports of anaphylaxis to beer caused by allergy to barley. Other patients have developed respiratory symptoms after drinking win... Read More
A 20-year-old female asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Nope: Skin tests, rast tests or serum specific ige alone can not diagnose food allergy. There is a very high false positive rate with rast testing, especial... Read More
A 45-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
24 hours : Claritin (loratadine) lasts approximately 24 hours hours and is dosed once a day.
A 39-year-old member asked:
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Yes: Antihistamines and nasal steroids are often used together for the treatment of allergic rhinitis.

90,000 U.S. doctors in 147 specialties are here to answer your questions, provide medical advice, write prescriptions, and more.

Ask doctors free
Answer emailed
in 24 hours or less

Testimonials
Recommendations and Thank you notes are endorsements given from patients or other doctors.

2
Recommendations
95
Thank you notes
HealthTap member
Mar 31, 2015
Dr. Johnston is an amazing doctor! #nationaldoctorsday2015 #virtualflower1
HealthTap member
Mar 30, 2015
Dr. Johnston is an amazing doctor! #nationaldoctorsday2015 #virtualflower1
HealthTap member
Thank you, your answer was very helpful!
HealthTap member
Thank you, your answer was very helpful!
HealthTap member
Your answer was very helpful! Thanks :)

Education & Training

Medical/Graduate school

New York Institute of Technology New York College of Osteopathic Medicine, NY
Graduated 2001MD

Awards

Top Allergist and Immunologist , First Place, North Carolina - Summer
2013
90,000 U.S. doctors in 147 specialties are here to answer your questions, provide medical advice, write prescriptions, and more.
Answer emailed
in 24 hours or less