Side effects from Biologic Medication

It’s completely understandable to feel unsure before starting a biologic — especially when you’ve heard different experiences from different people.
Most patients with ABPA or severe Aspergillus-related asthma do very well on biologics. Side effects can happen, but they’re usually mild and settle quickly.

🌟 Most people report very few problems

Patients often say:

• The injections are straightforward

• They feel the same or better within days or weeks

• There’s little or no impact on daily life

🌟 Common, mild side effects

These are the ones we hear most often across omalizumab, benralizumab, dupilumab and tezepelumab:

📌 Injection-site reactions

• Redness

• Itching

• A small tender lump

• Bruising
  These usually disappear within 24–48 hours.

📌 Mild tiredness

Some people feel slightly “wiped out” after the first few doses.

📌 Headache

Very common with the first injection. Less so afterwards.

📌 Minor joint or muscle aches

A bit like the feeling after a flu jab.

📌 Nasal or sinus changes

Occasional mild dryness or congestion, especially with dupilumab.

🌟 Less common (still mild)

• Mild tummy upset

• Sore throat

• A brief “flu-ish” feeling

• Temporary increase in eczema (mainly with dupilumab)

• Slight mood dip for a day or two (rare)

🌟 Rare but important

These are very uncommon, and your team will explain what to look out for:

• Allergic reaction shortly after an injection
  (This is why your first dose is supervised.)

• Eye inflammation — mostly linked to dupilumab, usually mild and treatable

Your team will give you clear advice on what to do if anything unusual happens.

🌟 What ABPA patients often notice

People with ABPA frequently describe:
👉 Fewer allergic symptoms
👉 Clearer breathing
👉 Much less mucus
👉 Fewer flare-ups and fewer steroids

But biologics don’t help everyone — which is why the first few months are monitored closely.

🌟 Final reassurance

For many aspergillosis patients, biologics are far easier than long-term steroids or antifungals. Most say the benefits outweigh the side effects — but every person’s experience is individual.