Allergy & asthma specialists · Clackamas & Tigard

Breathe easier through every Oregon season.

Personalized care for allergies, asthma and food allergy, backed by more than 50 FDA clinical studies led right here in Portland.

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  • 50+FDA studies led
  • 99.9%food-allergy patients desensitized
  • 1 of 3Oregon clinics offering food OIT

What we treat

Allergy & asthma treatment services

Dr. Fritz and his staff offer a range of treatments for your specific needs, using cutting-edge techniques and medicines, some first studied by our own research arm, Portland Research.

Allergy relief

We can ease the symptoms, or change the course of the disease, for nearly any type of allergy, from the most common to the rarest.

Asthma treatment

25 million Americans have asthma, and 60% of cases are driven by allergies. We build a personal asthma management plan so you can live a normal, active life.

Desensitization

Food oral immunotherapy (OIT), plus drug and venom desensitization, to build lasting tolerance instead of just avoiding triggers.

How desensitization works →

Conditions we treat

  • Nose & eye allergies
  • Seasonal allergies
  • Hay fever
  • Rhinitis
  • Sinusitis
  • Nasal polyps
  • Asthma
  • Bronchitis
  • COPD
  • Vocal cord dysfunction
  • Food allergy
  • Drug allergy
  • Aspirin sensitivity
  • Latex allergy
  • Insect sting & venom allergy
  • Anaphylaxis
  • Hives
  • Eczema
  • Dermatitis
  • Contact dermatitis
  • Pet allergies
  • Dust allergy
  • Hereditary angioedema (HAE)

Freedom from reactions

Food, drug & venom desensitization

More than 200,000 Americans visit the ER each year for food allergies. Portland Allergy & Asthma is one of only three clinics in Oregon able to provide food desensitization.

Food oral immunotherapy (OIT)

Done over the long term, OIT can free patients from reactions to egg, milk, soy, peanut, tree nuts, seeds and wheat. Dr. Fritz has conducted OIT research published in The New England Journal of Medicine and wrote a book chapter on food allergy used to teach physicians worldwide. Over the past ten years he has desensitized 99.9% of his food-allergic patients.

What the OIT process looks like

  1. Build-up, about 2–12 months. You eat gradually larger daily amounts of the food you're allergic to.
  2. Regular check-ins. Clinic visits, usually every 1–2 weeks, to see how you tolerate each new dose level.
  3. Daily maintenance. Once you reach your target, a daily maintenance dose keeps your tolerance in place.
Request an OIT consultation

Drug desensitization

We can desensitize patients to aspirin, penicillin and other antibiotics in just 1 to 5 days of treatment, depending on the medication.

Venom desensitization

For dangerous reactions to honey bee, wasp, yellow jacket or hornet stings. After testing identifies the insect, desensitization makes future stings far less likely to cause a problem. It's a simple, potentially life-saving treatment covered by almost all insurance plans.

Dr. Stephen Fritz, MD, allergist at Portland Allergy & Asthma
Stephen Fritz, MD Allergist & Principal Investigator

About us

A Portland native caring for Portland families

Dr. Fritz grew up in Portland and has practiced allergy and asthma medicine for more than 25 years, since beginning his fellowship in Michigan in 2001. He now welcomes patients at our Clackamas and Tigard clinics. We treat every type of allergy, and we are one of the few clinics in Oregon to provide food, venom and drug desensitization. We are also one of the largest practices on the West Coast for hereditary angioedema (HAE) patients and research studies.

Patient-centered care is the heart of our practice. We take the time to understand your needs, and our goal is simple: you should feel better walking out of our office than when you walked in.

Research that reaches your care

Dr. Fritz has been the principal investigator in over 50 FDA-approved studies and is recognized as a leader in his field. Being involved in research lets us offer new therapies that few practices can match.

  • 25+ years of experience
  • 50+ FDA studies as principal investigator
  • 4.75★ patient rating on ZocDoc
  • Published peanut OIT research in The New England Journal of Medicine

Patient stories

What our patients say

“We had a wonderful experience going through oral immunotherapy for nut allergies. My 12-year-old son is doing great because of their help. I didn't think he would ever be able to eat nuts… They really care. I highly recommend Dr. Fritz and OIT.”

Parent of an OIT patient

“Through this clinic I have become able to be around cute dogs, ridden my first horse and gotten off the inhaled steroids I depended on for years. I have also desensitized myself to peanuts, a life-long deadly allergy for me.”

Patient for five years

“Dr. Fritz made my hives go away after I had been to the ER 10 times with no improvement.”

Hives patient

“He made me feel like I was visiting family when I was really nervous because I'm afraid of needles. He's made a big difference in how I feel during the spring and summer.”

Allergy shot patient

“They helped my husband with his asthma. My son can now eat nuts safely, and my sneezing and stuffy nose is completely gone. He will always be my family's go-to allergist!”

Family of patients

“I tried other allergists in my community, but Dr. Fritz was the only one who was able to improve my allergy symptoms.”

Allergy patient

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Before your visit

Patient forms & billing

Call the clinic of your choice to book, then download and fill out the forms below before your first appointment.

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Two clinics

Visit us in Clackamas or Tigard

Call the office of your choice to book an appointment.

Clackamas Clinic

8740 SE Sunnybrook Blvd., Suite 300
Clackamas, OR 97015
Mon – Fri
8:30 am – 5:00 pm
Lunch
Closed 12:30 – 1:30 pm

(971) 358-5600Fax (971) 358-5601

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Tigard Clinic

Roosevelt Building
9370 SW Greenburg Rd., #311
Portland, OR 97223
Mon – Wed, Fri
8:30 am – 5:00 pm
Thursday
Closed
Lunch
Closed 12:30 – 1:30 pm

(503) 245-8060Fax (971) 358-5801

Get directions →