🫁 Biologics for Severe Asthma and Respiratory Conditions: What to Expect

A guide to when they start working, patient experiences, how long the benefits last — and what to know about Tezepelumab

Biologic treatments — like omalizumab, mepolizumab, benralizumab, dupilumab, and now tezepelumab — have transformed care for people with severe asthma and related lung conditions. But many patients naturally ask:

• When will I start to feel better?

• Will the benefit last?

• Am I eligible for this treatment?

• What if it wears off or I stop taking it?

• Which biologic is right for me?

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💷 Access to Biologics: Who Can Have Them?

Biologics are highly effective — but they are also expensive treatments, often costing £10,000–£30,000 per year. Because of this, the NHS only offers them to patients who meet strict criteria.

This helps ensure:

• Fair access

• Best use of NHS resources

• That patients are likely to benefit

✅ To qualify for a biologic, patients must typically:

1. Have confirmed severe asthma

   • Symptoms remain poorly controlled despite taking:

     • High-dose inhaled steroids (ICS)

     • Long-acting beta agonists (LABAs)

     • Other controller medication (e.g. montelukast)

2. Have frequent asthma attacks

   • Usually 2 or more flare-ups in the past year needing:

     • Oral steroids (e.g. prednisolone)

     • A&E or hospital care

3. Be using their inhalers properly and regularly

   • Doctors will check that medication is being taken as prescribed

   • Inhaler technique must be correct

   • Other problems (like reflux or anxiety) must be addressed first

4. Have the right blood or allergy profile
   (This depends on which biologic is being considered):

5. Be assessed by a specialist team

   • Biologics are only prescribed after a full multidisciplinary review in a specialist asthma service

🔄 After Starting:

• Patients are reviewed after 3–6 months

• If there’s no improvement, treatment is stopped

• Continued use depends on measurable benefit, such as:

  • Fewer attacks

  • Reduced steroid need

  • Better lung function or asthma control scores

💬 “Biologics are not a quick fix — but when matched carefully, they can be life-changing.”

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⏳ When Will I Start Feeling Better?

Most patients begin to feel some improvement within the first few weeks to three months.

🟩 What Other Patients Say:

• Lynn (USA):

  “Within five days, I could tell … I was not coughing as much.”

• Mena, 17 (USA):

  “She doesn’t have to rely on steroids as much.”
  “Now I’m stable.”

• Catherine, 88 (UK):

  “Since taking biologics, I’ve not had to call the office about breathing problems once.”

• UK Patient Survey:

  “Biologic treatment stopped the disruption of family and social life.”
  “Energy and mental health improved by 3 months.”

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📈 Typical Timeline of Benefits:

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📆 How Long Do the Benefits Last?

If the biologic is working and you stay on treatment, the benefits can last for years:

• Many patients remain stable for 1–5 years or more

• Biologics are ongoing treatments — not cures, but long-term control

• If stopped, some patients stay well for a time, while others relapse

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💡 Spotlight on Tezepelumab (Tezspire)

Tezepelumab is a newer biologic that works differently from the others — it targets TSLP, an upstream trigger of inflammation. This makes it suitable for a broader range of asthma patients, including those without high eosinophils or obvious allergies.

🔹 How It Works:

• Blocks TSLP (thymic stromal lymphopoietin) — a key driver of inflammation

• Works across multiple asthma types (eosinophilic, allergic, non-allergic)

🔹 Dosing:

• 210 mg injection every 4 weeks (subcutaneous)

🔹 Benefits (NAVIGATOR & DESTINATION trials):

• Reduces asthma attacks by 56% regardless of eosinophil count or allergic status

• Improvement often seen within 2–4 weeks, with continued benefit over 1–2 years

• Long-term studies show sustained effectiveness and good safety

• After stopping, inflammation gradually returns but may remain better than baseline for a while

🧠 Tezepelumab is especially promising for patients who haven’t responded well to other biologics, or who don’t fit into the eosinophilic or allergic categories.

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✅ In Summary:

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