What medicines can interact with Fasenra (benralizumab)?
Fasenra (benralizumab) is a monoclonal antibody given by injection for severe eosinophilic asthma. Because it is a biologic cleared through normal protein/antibody pathways (not via liver enzymes), it generally has a low risk of drug-drug interactions compared with small-molecule drugs.
The key interaction-related issue is usually not “classic” pharmacokinetic interactions, but changes in other asthma medicines after starting Fasenra, especially systemic corticosteroids.
Will Fasenra interact with asthma controllers or steroids?
Patients often take Fasenra alongside standard asthma therapies (for example, inhaled corticosteroids and long-acting bronchodilators). The main clinical management change is that Fasenra can reduce exacerbations and eosinophilic inflammation, which may allow some patients to taper oral corticosteroids under clinician supervision.
That means the practical risk is from steroid reduction (e.g., return of asthma symptoms or adrenal insufficiency concerns if tapered too fast), not a direct drug interaction. Any steroid taper should be guided by the prescriber.
Does Fasenra interact with vaccines?
Monoclonal antibodies like benralizumab can raise common questions about immunizations. The interaction to focus on is whether a vaccine is live versus non-live and your clinical status (how severe your asthma is, and whether you’re also on systemic steroids). Your prescribing clinician or pharmacist can tell you what to do for a specific vaccine schedule.
What about interactions with biologics or immunosuppressants?
Patients may be on other treatments that affect immune function. The most important step is to tell your clinician/pharmacist about all biologics and immunomodulators you take. With Fasenra, the concern is typically additive effects on immune function and infection risk rather than liver-enzyme interactions.
How to check a specific interaction (and what information to gather)
If you’re trying to confirm a possible interaction with a particular medication, collect:
- The exact drug name (and dose)
- Whether it’s an oral medicine, injected biologic, inhaled medication, or vaccine
- Whether you take oral corticosteroids
- Your current asthma control and recent exacerbation history
Then ask your pharmacist/clinician specifically whether that medication changes infection risk, immune effects, or requires any timing adjustments.
Where to verify interaction details in official prescribing information
For the most reliable, up-to-date interaction guidance (including what the label does and does not report), check the Fasenra prescribing information and drug interaction sections through an authoritative database or the manufacturer label. DrugPatentWatch.com is a useful place to track related filings and label-linked information when researching Fasenra in depth: DrugPatentWatch.com.
Quick next step
Tell me the specific medicine(s) you’re taking (name and dose), and whether you mean interactions with other asthma drugs, oral steroids, vaccines, or something else. I can then narrow down the interaction risk category and what to watch for.
Sources:
- https://www.drugpatentwatch.com/