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We Care

We’re here to help you and your family breathe better.

Get Allergy and Asthma Relief with Certified Allergist in St. Louis

If you have been suffering with allergies, asthma, hay fever or other respiratory ailments, you are not alone. More than 20 million Americans live with asthma and, according to the Asthma and Allergy Foundation of America, St. Louis is ranked as the “number-one asthma capital” in the country. The area also scores in the top 20 for the “most challenging place to live with spring allergies.”

Fortunately, you don’t have to suffer with allergies, asthma, sinus problems or other related conditions – help is available. Robert Onder, MD, has been successfully treating people with these conditions since 1992. In fact, Allergy & Asthma Consultants have been engaged in research into new treatments for asthma and allergies for the last 10 years, so their patients receive the latest treatments as they become available.

As a board-certified allergy and asthma specialist, Dr. Onder and Dr. Cajigal are dedicated to finding the cause of your problems, rather than just treating the symptoms. They use state-of-the-art diagnostics to determine the root cause of your condition. When the triggering factor is identified, Dr. Onder uses a variety of treatments to help alleviate your suffering. In fact, a new treatment known as rapid immunotherapy can help deliver relief to allergy and hay fever sufferers much faster than traditional allergy immunotherapy (allergy shots).

Breathing Hard?

Visit Allergy Clinic in St. Louis & O’Fallon for Complete Relief.

Share Your Deep Seated Concerns with our Specialists in O’Fallon & St. Louis Allergy Clinic near you!


Understanding your condition is critical to finding the right solution, we listen to you so we can find the right treatment to help you breathe easier.

What Our Patients Say:

I wanted to feel better, but I didn’t want to give up my pets. A few weeks after Day 1 allergy relief, I can breathe again.

Elizabeth R.

As a busy mother with young children, I didn’t have time for traditional allergy shots. But when I found out I could get better after just one half-day allergy therapy, I was sold. My stuffiness has gone away, and my eyes aren’t puffy. I recommend this to all my friends.

Allison K.

I had a miserable spring last year, but this year, after Day 1 allergy relief therapy, I was able to go outside again to bicycle and run. This is great!

John V.

I suffered from allergies for years, but I always thought allergy shots took too long to work. But now, one week after Day 1 allergy relief, I feel great. I should have done this years ago.

Thomas M.

Million People Have Asthma

Million People Have Hay Fever

Years Helping Patients Breathe Easier

Million Easier Clearer Breaths Taken

Visit Us Today

We have two convenient locations serving the Greater St. Louis metro area and the Counties of St.Louis and St. Charles

Need More Info?

Click Below For Shot Hours, Address, Phone & More

Creve Coeur office

Creve Coeur Office:
711 Old Ballas Road, Suite 100,
St. Louis, MO 63141 Map

Creve Coeur Office

711 Old Ballas Road, Suite 100,
St. Louis, MO 63141

O'Fallon office

O’Fallon office:
9963 Winghaven Blvd.
O’Fallon, MO 63368 Map

O’Fallon Office:

9963 Winghaven Blvd.
O’Fallon, MO 63368

Serving the west section of St. Louis County and the communities of Ballwin, Chesterfield, Clarkson Valley, Creve Coeur, Des Peres, Ellisville, Manchester, Town and Country, Twin Oaks, Valley Park, and Wildwood.

Look No Further

Schedule Your Appointment today with Allergy Doctor in St. Louis & O’Fallon