Allergy Shots or Biologics? Choosing Treatment for Severe Allergic Asthma

SEPTEMBER ASTHMA SERIES — Post 4 of 4

Families of children with allergic asthma often hear about allergy shots. For the right child, allergen immunotherapy can help. But for a child with severe, uncontrolled type 2 or allergic asthma, allergy shots may not be the best first option. Biologic therapies were designed to fill exactly that gap.

What is allergen immunotherapy?

Allergen immunotherapy, usually called allergy shots, means injecting slowly increasing doses of the specific allergens a child reacts to, such as dust mite, pollen, or pet dander. Over time, the goal is to make the immune system more tolerant so allergy symptoms, and sometimes asthma symptoms, improve.

Immunotherapy is a long commitment. It typically starts with a build-up phase of frequent office injections, often weekly for several months, followed by maintenance injections about once a month for three to five years. Each shot is given in a medical office with an observation period afterward in case of a reaction.

What are biologic shots?

Biologics are lab-made antibodies that block one specific part of the inflammation that drives type 2 or allergic asthma. Depending on the medication, they target pathways such as IgE, interleukin-5, the interleukin-4 and interleukin-13 receptor, or TSLP. Instead of retraining the immune system to individual allergens, they turn down the inflammation itself.

Biologics are given as an injection every two to eight weeks, depending on the medication. After the first doses are given safely, many can be given at home. Eligibility depends on the child’s age, asthma severity, and markers of type 2 inflammation such as blood eosinophils, IgE, and exhaled nitric oxide.

Why allergy shots may not be the best fit for severe uncontrolled asthma

• Missed school. The build-up phase alone can mean weekly office visits for months, and maintenance continues for years. For school-age children, that adds up to frequent missed class time and missed work for parents.

• Higher risk when asthma is volatile. Uncontrolled or severe asthma is one of the main risk factors for serious reactions to allergy shots, including asthma flares and severe systemic reactions. The children who need help most are often the least safe candidates until their asthma is controlled.

• A long wait for benefit. Improvement from immunotherapy can take many months to a year or more to show up. A child with frequent ER visits, hospitalizations, or oral steroid courses needs a plan that works sooner.

• Possible treatment failure. Not every child responds. Children sensitized to many allergens, or whose asthma is driven by more than allergy, may not get enough benefit even after years of shots.

Where biologics fill the gap

For children with severe asthma that stays uncontrolled despite good inhaled therapy and correct inhaler technique, biologics can reduce flares, emergency visits, hospitalizations, and the need for oral steroids. Benefit is often seen within a few months. Because biologics target inflammation directly, they do not depend on identifying and treating each allergen one at a time.

Biologics are not a replacement for the basics. Controller medication, the right inhaler device, asthma education, and trigger management still matter. But when those steps are in place and asthma is still not controlled, a biologic is often the next right step.

Choosing the right path

Allergy shots and biologics are not competitors in every case. Some children do well with immunotherapy once their asthma is stable. The key is matching the therapy to the child’s severity, inflammation pattern, safety, and daily life.

If your child has severe or uncontrolled allergic asthma, frequent oral steroid courses, or has been told allergy shots are the only next step, ask for a pediatric pulmonary evaluation. We can assess whether your child is a candidate for biologic therapy and build a plan that works sooner and more safely.

Sarat Susarla, MD

Pediatric Pulmonology and Sleep Medicine

Houston Specialty Clinic