Biologic Medications for Asthma and Allergies: What They Are and Who They Help

Key Points

• Biologic medications are a newer class of targeted therapies that work by blocking specific pathways in the immune system responsible for allergic inflammation
• Biologics are used to treat severe or uncontrolled asthma, eczema, chronic hives, and nasal polyps when standard medications are not enough
• Unlike traditional allergy medications, biologics address the underlying immune mechanisms driving symptoms rather than just suppressing them
• Common biologics used in allergy and asthma care include Dupixent, Xolair, Fasenra, Nucala, and Tezspire
• Dr. Jeffrey Jacobs offers biologic medication management and administration at Allergy & Asthma Specialists of the Palm Beaches in Jupiter, FL

Medically reviewed by: Dr. Jeffrey Jacobs, MD | Board-Certified Allergist & Immunologist | August 2026

If you have been living with severe asthma, persistent eczema, or chronic hives that do not respond well to standard treatments, you may have heard the word "biologic" come up in conversation with your doctor. Biologic medications represent one of the most significant advances in allergy and asthma care in recent decades, and for the right patients, they can produce dramatic improvements in symptoms and quality of life.

Understanding what biologics are, how they work, and whether you might be a candidate is worth knowing before your next appointment.

What Is a Biologic Medication?

Traditional allergy and asthma medications like antihistamines, corticosteroids, and bronchodilators work broadly. They suppress inflammation, block histamine, or relax airway muscles without targeting a specific part of the immune process. They are effective for many patients, but for those with more severe or complex disease, broad suppression often is not enough.

Biologic medications take a different approach. They are engineered proteins, typically monoclonal antibodies, designed to target and block a very specific molecule or pathway in the immune system that is driving inflammation. Rather than dampening the entire immune response, a biologic zeroes in on a single component of the allergic cascade and interrupts it at the source.

This precision is what makes biologics so effective for the right patients. It is also why they are generally reserved for patients with moderate to severe disease that has not responded adequately to standard treatment. They are not a first-line medication, but for patients who need them, they can be life-changing.

How Does the Allergic Immune Pathway Work?

To understand why biologics are effective, it helps to understand what they are targeting.

In allergic disease, the immune system overreacts to triggers that are not actually dangerous. A key part of that overreaction involves a type of inflammation called type 2 inflammation, driven by signaling proteins called cytokines. Two of the most important cytokines in allergic disease are interleukin-4 (IL-4) and interleukin-13 (IL-13), which drive conditions like eczema and asthma. Interleukin-5 (IL-5) drives the overproduction of eosinophils, a type of white blood cell that plays a central role in severe asthma. IgE antibodies trigger the release of histamine and other chemicals when exposed to allergens.

Different biologics target different parts of this pathway. Matching the right biologic to the right patient depends on which part of the immune pathway is most active in their disease, which is determined through blood tests and clinical evaluation.

Which Biologics Are Used in Allergy and Asthma Care?

Several biologic medications are currently FDA-approved for conditions treated by allergists. Here is a plain-English overview of the most commonly used ones.

Dupixent (dupilumab) blocks the IL-4 and IL-13 signaling pathway and is one of the most versatile biologics available. It is FDA-approved for moderate to severe eczema (atopic dermatitis), moderate to severe asthma with an eosinophilic or type 2 inflammatory profile, chronic rhinosinusitis with nasal polyps, and most recently chronic spontaneous urticaria (a form of chronic hives). Many patients on Dupixent experience significant improvement across multiple conditions simultaneously, which is particularly valuable for patients with overlapping allergic disease.

Xolair (omalizumab) targets IgE, the antibody most directly responsible for triggering allergic reactions. It is used for moderate to severe allergic asthma and chronic idiopathic urticaria. Xolair was also recently approved as the first biologic treatment for multiple food allergies, reducing the risk of severe reactions in patients sensitized to peanut, milk, egg, wheat, and other foods. This represents a significant shift in how food allergy can be managed at the immune level.

Fasenra (benralizumab) and Nucala (mepolizumab) both target the IL-5 pathway, reducing eosinophil levels in the blood and airways. They are used primarily for severe eosinophilic asthma, a subtype of asthma characterized by high eosinophil counts and frequent exacerbations despite standard controller medications.

Tezspire (tezepelumab) is one of the newest biologics and works further upstream in the inflammatory cascade by blocking TSLP, a protein released by airway cells that initiates the type 2 inflammatory response. It is approved for severe asthma and is notable for being effective across multiple asthma subtypes, not just eosinophilic asthma.

Who Is a Candidate for Biologic Therapy?

Biologics are not appropriate for every patient with asthma or allergies, and they are not typically the first treatment tried. They are most appropriate for patients who meet certain criteria.

For asthma, candidates generally include patients with moderate to severe disease that is not adequately controlled despite using appropriate inhaled corticosteroids and long-acting bronchodilators, patients who require frequent oral steroid courses to manage flares, and patients who have had serious asthma exacerbations requiring emergency care or hospitalization. Blood tests that measure eosinophil levels and IgE concentrations help identify which biologic is the best match for each patient's specific inflammatory profile.

For eczema, candidates are typically patients with moderate to severe atopic dermatitis that has not responded adequately to topical treatments and other systemic therapies. For chronic hives, candidates are patients whose symptoms persist despite antihistamine treatment at standard and higher doses.

A thorough evaluation with a board-certified allergist is the starting point. Dr. Jacobs performs the clinical assessment and bloodwork needed to determine whether a biologic is appropriate and, if so, which one is the best fit for your specific condition.

What Does Biologic Treatment Look Like in Practice?

Most biologics used in allergy and asthma care are administered by injection, either in the office or, for some medications, at home after proper training. Dupixent, for example, is self-injected at home every two to four weeks depending on the condition being treated. Xolair and Fasenra are administered in a clinical setting with a post-injection observation period.

The biologic medication management and administration services at our Jupiter office include the full scope of care: clinical evaluation to determine candidacy, assistance navigating insurance prior authorization (which is required for all biologics), administration of in-office biologics with appropriate monitoring, and ongoing management to assess response and adjust the treatment plan as needed.

Most patients begin to notice improvement within the first few weeks to months of starting a biologic. For eczema patients on Dupixent, skin improvement is often visible within four to sixteen weeks. For asthma patients, reduced exacerbation rates and improved lung function typically develop over the first three to six months. The goal for most patients is meaningful, sustained symptom control with a reduced need for oral steroids and other rescue medications.

What About Insurance and Cost?

Biologic medications are expensive, and prior authorization from your insurance company is required before treatment can begin. The prior authorization process involves submitting documentation of your diagnosis, the treatments you have already tried, and the clinical rationale for why a biologic is medically necessary.

This process can feel daunting, but it is a standard part of biologic prescribing and our office handles the documentation and coordination involved. Most major insurance plans, including Medicare and many Medicaid plans, do cover biologic medications for approved indications when prior authorization criteria are met. Manufacturer patient assistance programs are also available for patients who face significant out-of-pocket costs after insurance.

Frequently Asked Questions

Are biologic medications safe for long-term use? Biologics used in allergy and asthma care have been studied extensively and have well-established safety profiles. Because they target specific immune pathways rather than broadly suppressing immunity, they generally do not carry the same risks associated with long-term oral corticosteroid use, such as bone density loss, blood sugar changes, and adrenal suppression. Side effects vary by medication but are generally mild; injection site reactions are the most common. Dr. Jacobs reviews the specific safety profile of any biologic being considered as part of the treatment discussion.

How do I know which biologic is right for me? The right biologic depends on your specific diagnosis, the inflammatory markers present in your bloodwork, and which conditions you are managing. A patient with severe eosinophilic asthma and high eosinophil counts may be a better candidate for Fasenra or Nucala than for Dupixent. A patient with overlapping asthma and eczema may benefit most from Dupixent's dual mechanism. This is exactly the kind of individualized decision-making that a board-certified allergist is trained to guide.

Can I stay on my other asthma or allergy medications while taking a biologic? In most cases, yes, at least initially. Many patients continue their existing controller medications when starting a biologic and then work with Dr. Jacobs over time to reduce or eliminate medications they no longer need as their symptoms improve. Biologic therapy is not typically a replacement for all other medications from day one, but for many patients it eventually allows significant reduction in medication burden.

How long does biologic treatment last? Most patients remain on biologic therapy on an ongoing basis as long as it is effective and well tolerated. Unlike allergen immunotherapy, which has a defined course of three to five years after which many patients maintain benefit, biologics generally need to be continued to maintain their effect. That said, some patients are able to reduce dosing frequency or eventually trial coming off a biologic under close supervision if their disease has been well controlled for an extended period.

Will my insurance cover a biologic medication? Most major insurance plans cover FDA-approved biologics for their approved indications when prior authorization criteria are met. The prior authorization process requires documentation of your diagnosis and treatment history. Our office manages this process and works to ensure the documentation submitted gives your claim the best chance of approval. Manufacturer assistance programs are available for eligible patients who face high out-of-pocket costs.

If standard asthma or allergy treatments have not given you the control you need, biologic therapy may be the next step worth exploring. Call our Jupiter office at (561) 510-7232 or book online here to schedule an appointment with Dr. Jacobs.