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Happy Holidays – following are our holiday hours:
CLOSED - Friday, December 24, 2021
CLOSED - Saturday, December 25, 2021

Happy New Year:
OPEN: Friday, December 31, 2021  -   10:00 am – 1:00 pm
CLOSED: Saturday, January 1, 2022

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Oak Brook Allergists
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    • Downers Grove: (630) 789-0575
    • Elmhurst: (630) 574-0460
    • Naperville: (630) 961-2960
    • Plainfield: (815) 609-8286
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  • Our Team
    • David J. Knysak, MD
    • Raymond M. Pongonis Jr., MD
    • Zachary E. Rubin, MD
    • Jennifer Catalfio, PA-C
    • Tammy Laas, APRN-CNP
  • Conditions & Treatments
    • Allergic Rhinitis (Hay Fever)
    • Asthma
    • Chronic Sinusitis
    • Eczema & Hives
    • Food Allergies
    • Oral Immunotherapy
    • Pet Allergies
    • Stinging Insect Allergies
  • For Kids
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  • Contact & Locations
    • Downers Grove
    • Elmhurst
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Oak Brooks Allergists
Now offering Oral Immunotherapy A leading treatment for food allergy
Oak Brooks Allergists
Board-Certified Allergists providing care for children and adults
Oak Brooks Allergists
Live Life Clearly providing relief from pet allergies
Oak Brooks Allergists
Breathe Easier with year-round relief
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Welcome to Oak Brook Allergists

Get ready to breathe easier. At Oak Brook Allergists, we’re dedicated to providing complete allergy and asthma healthcare for patients of all ages. We offer a wide range of diagnostic testing and treatments, including oral immunotherapy – a revolutionary approach to treating food allergies that, while not a cure, is the closest we have come to date. Oak Brook Allergists has been providing the finest in allergy and asthma care in northeastern Illinois since 1962. Because your symptoms aren’t convenient, we make sure we are. Our extended and weekend hours and four convenient locations throughout DuPage and Will counties make it easy to get the care you need right away.

Conditions And Treatments

Allergic Rhinitis (Hay Fever)

Are you plagued with seasonal allergies? Hay fever – or allergies to pollen from trees, weeds, and grass – is common, and treatable.

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Asthma

Knowing and understanding your asthma triggers is essential to formulating a customized treatment plan that works.

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Chronic Sinusitis

Sinus infections are more than just a nuisance. If you have allergies or asthma, chronic sinusitis can keep you in a constant state of misery.

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Eczema & Hives

Keeping your allergies in check can help prevent outbreaks of skin conditions like eczema and hives, which can be frustrating to treat.

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Food Allergies

The providers at Oak Brook Allergists are leading experts in the diagnosis and treatment of many different types of food allergies.

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Pet Allergies

There is no such thing as a “hypoallergenic” dog or cat. Even hairless breeds have the problematic allergen in their saliva and skin cells (dander).

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Stinging Insect Allergies

If you suffer from an allergy to bee stings, chances are your reaction to the next sting may be far worse than it was before.

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Oral Immunotherapy

This revolutionary desensitization therapy modifies the immune system response, allowing you stop a food allergy before it begins

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child's playing in field

For Kids

We want to make it as easy as possible for parents to help their children understand what may be bugging them – and how the kind and caring professionals at Oak Brook Allergists can help them eat, breathe, and live a happier, healthier life.

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Meet Our Team

Determining the source of an allergic, asthmatic, or immune disorder can be a complicated process—which is why you want the highly specialized and experienced team at Oak Brook Allergists on your side.

  • David J. Knysak, MD
    David J. Knysak, MD

    David J. Knysak, MD

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  • Raymond M. Pongonis Jr., MD
    Raymond Pongonis Jr., MD

    Raymond Pongonis Jr., MD

    Learn More
  • Zachary E. Rubin, MD
    Zachary E. Rubin, MD

    Zachary E. Rubin, MD

    Learn More
  • Jennifer Catalfio, PA-C
    Jennifer Catalfio, PA-C

    Jennifer Catalfio, PA-C

    Learn More
  • Tammy Laas, APRN-CNP
    Tammy Laas, APRN-CNP

    Tammy Laas, APRN-CNP

    Learn More

Our Locations

  • Downers Grove

    Downers Grove

    6800 S. Main Street,
    Suite 110
    Downers Grove, IL 60516
    Phone: (630) 789-0575
  • Elmhurst

    Elmhurst

    360 W. Butterfield Road,
    Suite 140
    Elmhurst, IL 60126
    Phone: (630) 574-0460
  • Naperville

    Naperville

    1220 Hobson Road,
    Suite 114
    Naperville, IL 60540
    Phone: (630) 961-2960
  • Plainfield

    Plainfield

    24600 W. 127th Street,
    Suite 110
    Plainfield, IL 60585
    Phone: (815) 609-8286

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Oak Brook Allergists Blog

Learn about the latest advances in allergy and asthma treatments, plus news about our practice.

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Patient Education

Explore allergy and asthma conditions and treatments in our patient education center.

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Oak Brooks Allergists

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At Oak Brook Allergists, our asthma and allergy specialists offer comprehensive care for Allergic Rhinitis (Hay Fever), Asthma, Chronic Sinusitis, Eczema & Hives, Food Allergies, Pet Allergies, and Stinging Insect Allergies.