Dr. S. Yung, Allergist

Allergy & Asthma Specialist in York Region

Dr. Samuel Yung is a MD specialist in Allergy/Clinical Immunology providing comprehensive care for patients of all ages with allergic, asthmatic or immunologic conditions, including:

  • Allergic rhinitis/sinusitis ("hayfever")
  • Immunotherapy ("allergy shots" or under-the-tongue tablets for allergies)
  • Food allergy
  • Drug allergy
  • Anaphylaxis/allergic reactions
  • Hives/swelling
  • Asthma
  • Eosinophilic esophagitis
  • Recurrent infections
  • Stinging insect allergy
  • Latex allergy
  • Eczema
  • Contact dermatitis

Languages Spoken: English, Cantonese

Consultations and allergy skin testing are covered by OHIP.

To see Dr. Yung you need a referral from a physician or nurse practitioner. Please speak with your healthcare professional to see if an Allergist is right for you.

Dr. Yung practices at multiple convenient locations in York Region/Greater Toronto Area. Please FAX referrals to the location of your choice.

Instructions for Patients Coming for their First In-Person Appointment

1. Please STOP medications containing antihistamines* (e.g. allergy and cold medications) for
at least three days (72 hours) prior to your appointment, unless otherwise instructed. Continuing antihistamines may affect your allergy skin testing results. Nasal sprays, eye drops and inhalers are OK to continue.


Benadryl (diphenhydramine)
Reactine (cetirizine)
Claritin (loratadine)
Aerius (desloratadine)
Allegra (fexofenadine)
Rupall (rupatadine)
Blexten (bilastine)
Chlor-Tripolon (chlorpheniramine)
Advil Nighttime
Tylenol Nighttime
Gravol (dimenhydrinate)

2. If you are coming for possible food allergy, please bring a small sample of the food you are concerned about as this may be needed for allergy skin testing. (You do not have to bring cow's milk, hen's egg, wheat, sesame, soy, peanut or treenuts).

3. Please bring a list of your medications.

Please call my office if you need clarification.

COVID-19 Pandemic

Dr. Yung is currently providing in-person and virtual/telemedicine care as needed.

About the Allergist: Samuel Yung, MD, FRCPC, DABAI

Dr. Yung is a Royal College (Canada) specialist in the fields of Allergy & Clinical Immunology (trained to look after both children and adults) as well as Internal Medicine. He is also American-Board certified in Allergy & Immunology (ABAI).

He is passionate about providing personalized, evidence based and compassionate care for patients of all ages.