Biologic Medications for Allergies and Asthma
Advanced Targeted Therapy for Patients Who Need More Than Standard Treatment
For patients with moderate to severe asthma or chronic allergic conditions that standard medications have not been able to control, biologic drugs represent a significant advancement in care. At Carefree Allergy, we evaluate whether biologic therapy is appropriate for your specific condition and guide you through the treatment process from testing to administration.
What Are Biologic Drugs?
Biologic medications, also called biologics, are a class of advanced therapies derived from living cells. Unlike traditional medications, which work broadly to suppress inflammation or relieve symptoms, biologics are designed to target specific proteins, antibodies, or immune cells that drive allergic and inflammatory reactions in the body.
They are typically administered as injections, either in a clinical setting or at home depending on the medication. Biologics are not first-line treatments. They are prescribed when standard therapies, such as inhaled corticosteroids, antihistamines, or other controller medications, have not provided adequate control.
Several biologics are now FDA-approved for conditions including severe asthma, chronic hives, atopic dermatitis, chronic sinusitis with nasal polyps, and food allergy.
How Do Biologics Work?
The immune system uses a complex network of proteins and signaling molecules — called cytokines and immunoglobulins — to coordinate its response to perceived threats. In allergic and asthmatic conditions, this response is misdirected. The immune system releases inflammatory signals in response to harmless triggers like pollen, pet dander, or food proteins, causing tissue swelling, airway narrowing, and other symptoms.
Biologics interrupt this process by blocking specific components of the inflammatory cascade before symptoms can develop. Rather than suppressing the immune system broadly, each biologic targets a precise pathway — the exact molecule or receptor responsible for a patient’s specific type of inflammation.
These medications take an inside-out approach to treating allergic conditions by addressing the issue at the immune system level, the root cause of many allergic diseases.
Before prescribing a biologic, your provider will order blood tests to measure relevant biomarkers, such as IgE antibody levels and eosinophil counts, that identify which inflammatory pathway is most active in your case. This determines which biologic is most likely to be effective for you.
Types of Biologics
Xolair (omalizumab)
Targets IgE antibodies, which are central to allergic reactions. It is approved for allergic asthma, chronic spontaneous urticaria, chronic rhinosinusitis with nasal polyps, and food allergy. Administered by injection every two to four weeks based on weight and IgE levels.
Dupixent (dupilumab)
Blocks the receptors for interleukins IL-4 and IL-13, two signaling proteins that drive airway inflammation and mucus production. Approved for moderate to severe eosinophilic asthma, atopic dermatitis, chronic sinusitis with nasal polyps, and oral corticosteroid-dependent asthma.
Nucala (mepolizumab)
Targets interleukin-5 (IL-5), a cytokine that promotes the growth and activation of eosinophils – white blood cells that contribute to airway inflammation. Approved for severe eosinophilic asthma, chronic rhinosinusitis with nasal polyps, and other eosinophil-related conditions. Administered monthly.
Fasenra (benralizumab)
Also targets the IL-5 pathway, but works by depleting eosinophils directly through the IL-5 receptor. Approved for severe eosinophilic asthma as an add-on maintenance treatment. After three initial monthly injections, it is administered every eight weeks.
Tezspire (tezepelumab)
Treats both allergic and eosinophilic asthma It is the only biologic approved for non-type-2 asthma, making it an option for patients who do not qualify for other biologics.
Cinqair (reslizumab)
Targets IL-5, similar to Nucala. Administered as an intravenous infusion in a clinical setting. Approved for severe eosinophilic asthma in adults.
Who Do Biologics Help?
Biologics are typically considered when a patient’s condition remains inadequately controlled despite consistent use of standard therapies. Candidates generally include patients who:
Have moderate to severe asthma with frequent exacerbations despite using controller inhalers
Rely on repeated courses of oral corticosteroids to manage symptoms
Live with chronic hives (urticaria) that do not respond to antihistamines
Have chronic sinusitis with nasal polyps that recur after surgery or do not respond to nasal steroids
Have moderate to severe atopic dermatitis not controlled by topical treatments
Experience frequent or severe reactions to food allergens (Xolair is now FDA-approved for food allergy)
Effectiveness
Biologics have demonstrated meaningful clinical benefits in patients with moderate to severe conditions who have not responded adequately to standard treatments. Across FDA-approved medications, clinical trials have consistently shown reductions in exacerbation rates, decreased reliance on oral corticosteroids, and improvements in lung function and quality of life.
Studies have shown that these medications can help prevent severe asthma attacks, reduce the use of oral steroids, increase activity levels, and improve quality of life.
That said, biologics do not work equally well for everyone, and individual response varies. Some patients see significant improvement within weeks; others may require two to three months before the full benefit becomes apparent. If a biologic does not produce adequate clinical improvement within four to six months, switching to a different agent is an option, as different biologics target different pathways.
Biologics for Asthma
Asthma is the most established indication for biologic therapy, with six FDA-approved options currently available. Xolair is approved for allergic asthma. Nucala, Fasenra, and Cinqair are approved for eosinophilic asthma. Dupixent may work for type 2 asthma more broadly – both allergic and eosinophilic. Tezspire may work for all types of severe asthma and is the only biologic approved for non-type-2 asthma.
Blood tests measuring eosinophil counts and IgE levels, along with lung function testing, guide the selection process. These biomarkers identify which inflammatory pathway is driving a patient’s asthma, and the biologic is chosen to match that specific pathway.
For patients with severe asthma who have been managing their condition with repeated courses of prednisone or frequent emergency care, biologic therapy can significantly reduce that burden, and in some cases, allow for meaningful reductions in long-term steroid use.
At Carefree Allergy, we conduct the necessary evaluation to determine whether biologic therapy is appropriate, identify the most suitable option based on your biomarker profile, and coordinate ongoing monitoring throughout treatment.
Lindsey Forstie, FNP and the Journey That Shaped Her Approach to Allergy Care
Lindsey’s journey into allergy and asthma care began long before her medical training. As a child, she struggled with undiagnosed asthma. Physical activity meant chest tightness, headaches, and falling behind despite her effort. For years, she believed her limitations were personal rather than medical. It was not until a school nurse recognized the signs of asthma and proper treatment began that everything changed. Breathing improved, confidence returned, and the boundaries she had quietly accepted began to disappear.
That experience shaped the direction of her career. Lindsey became a nurse, then a board certified family nurse practitioner specializing in allergy and immunology. She founded Carefree Allergy with a clear mission: no one should have to live within unnecessary limits caused by untreated asthma or uncontrolled allergies.
Board-Certified Provider
Licensed in Arizona
10+ Years Experience
Telehealth Statewide
Still Struggling With Asthma or Chronic Allergies Despite Treatment?
If standard medications are not providing the control you need, biologic therapy may be worth evaluating.
At Carefree Allergy in North Phoenix, we provide comprehensive testing, biomarker evaluation, and personalized treatment planning for patients with moderate to severe allergic and asthmatic conditions, including same-day appointments and telehealth available statewide across Arizona.
✓ Self-Pay & HSA✓ Superbills Provided✓ Same-Day Appointments
What Our Patients Say
Real stories from real people who found relief
SMSarah Mitchell
Arizona
Seasonal Allergies
★★★★★
After years of struggling with allergies, I finally found relief! The allergy drops are so convenient, and I’m no longer dependent on daily medications.
JRJames Rodriguez
Arizona
Food Allergies
★★★★★
The testing was quick and thorough. Knowing exactly what I’m allergic to has completely changed how I manage my symptoms. Highly recommend!
ECEmily Chen
Arizona
Asthma & Allergies
★★★★★
Lindsey is amazing! She took the time to understand my unique situation and created a treatment plan that actually works. I can breathe easy again!
Common Questions
What conditions can biologics treat?
FDA-approved biologics currently cover a range of allergic and inflammatory conditions, including moderate to severe asthma (allergic, eosinophilic, and non-type-2), chronic spontaneous urticaria (hives), atopic dermatitis, chronic rhinosinusitis with nasal polyps, and food allergy. The specific biologic prescribed depends on the condition and the inflammatory pathway involved.
How long does it take for biologics to work?
Response time varies by medication and individual. Some patients notice improvement within a few weeks; for others, the full benefit may take two to three months. Clinical evaluation at four to six months helps determine whether a given biologic is producing adequate results or whether a different agent should be considered.
How are biologics administered?
Most biologics are administered as subcutaneous (under-the-skin) injections. Some, like Dupixent, Nucala, and Fasenra, can be self-administered at home once a provider has demonstrated the technique. Others, like Xolair and Tezspire, require administration and monitoring in a clinical setting. Cinqair is the only current biologic given as an intravenous infusion.
Are biologics safe?
Biologics have been evaluated in extensive clinical trials and are considered safe for appropriate patients. The most common side effect is a mild reaction at the injection site. Severe allergic reactions to the biologic itself are rare. Patients receiving biologics that require clinical administration are monitored after each injection.
Do biologics replace inhalers or other medications?
Biologics are add-on treatments, not replacements for existing medications. They are prescribed alongside standard controller therapies. One of the goals of biologic therapy, particularly in asthma, is to reduce the need for oral corticosteroids over time, but this reduction is managed gradually under clinical supervision.
Can children receive biologic therapy?
Yes, depending on the medication and condition. Several biologics are approved for pediatric use. Xolair is approved for allergic asthma in patients as young as 6 years old. Dupixent, Nucala, and Tezspire are also approved for patients aged 6 or 12 and older, depending on the indication. Pediatric dosing and eligibility are determined by age, weight, and biomarker levels.