Medical Oncologist
Cetuximab (Erbitux)
Cetuximab Infusion Day: — What to Expect
Every cetuximab infusion starts with premedication and ends with a monitored wait. Your first dose takes longer than later ones. Knowing the sequence beforehand makes the day feel predictable rather than uncertain.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- Premedication comes first — An antihistamine is given through your drip line before every infusion to lower the risk of a reaction.
- First dose takes longer — The initial infusion runs at a slower rate than later ones, so your first visit is the longest.
- You stay after the drip ends — A monitored observation period follows every infusion before you are cleared to leave.
- A skin rash is expected — Most people develop an acneiform rash within the first two weeks. It is a known drug effect, not an allergic reaction.
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Every cetuximab infusion begins with premedication — an antihistamine given before the drip starts — to reduce the risk of an infusion reaction. Your first dose takes longer than later ones, and you stay for a monitored observation period after every infusion before you are cleared to leave.
What is cetuximab and how does it reach your body?
Cetuximab is a targeted antibody, not a chemotherapy drug. It works by binding to a protein on cancer cell surfaces called EGFR, blocking signals that tell cells to grow.
It is given only by intravenous drip — never as a tablet or injection. The drug enters a vein in your arm through a cannula or a port, whichever your team has set up.
It is used in certain head and neck cancers and in colorectal cancers that carry a specific molecular profile. Your oncologist will have confirmed the relevant result from your biopsy before your first infusion. If you are not sure which result made you eligible, ask before the drip starts.
How does the first infusion differ from later ones?
| Feature | First infusion | Subsequent infusions |
|---|---|---|
| Infusion rate | Slower — to watch for reactions | Faster — once tolerance is established |
| Total visit length | Longest visit; allow a full day | Shorter, but still a half-day commitment |
| Observation period after | Longer monitored wait required | Shorter, though still required after every dose |
| Infusion reaction risk | Highest with the first dose | Lower after the first, though reactions can still occur |
| Premedication | Required | Required before every dose, not just the first |
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MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
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Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
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MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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What happens on infusion day, in order?
Arrive and check in
Your team may draw blood before the infusion starts to check your levels. Tell the nurse about any new symptoms since your last visit, especially any skin changes or breathing problems.
Premedication is given
An antihistamine — and sometimes other medicines — is given through your drip line before the cetuximab begins. This is part of the safety protocol for every dose, not just the first.
The cetuximab infusion begins
The drug runs as a slow drip through your IV line. Nursing staff monitor you throughout. Tell them immediately if you feel flushing, chest tightness, a racing heart, or any breathing change — do not wait to see if it passes.
Post-infusion observation
When the bag empties, you stay in the chair for a monitored period. If a reaction is going to happen, it is most likely during this window. Do not plan to leave the moment the drip finishes.
Discharge and next appointment
Once your observations are stable and your team is satisfied, you are cleared to go. Your next infusion date is usually confirmed before you leave.
Did you know?
An acneiform skin rash — typically on the face, scalp, chest, or upper back — develops in a large proportion of people on cetuximab, usually within the first two weeks of treatment.
It is caused by EGFR inhibition in skin cells, not an allergy. Your team can advise on skincare from your very first infusion; starting early makes a significant difference to how manageable it is.
Source: Erbitux (cetuximab) Prescribing Information; NCCN Guidelines for Head and Neck Cancers
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Common questions
Frequently asked questions
How long will my first cetuximab infusion take?
Allow a full day for your first visit. The infusion itself runs at a slower rate than later ones, and it is followed by a mandatory observation period — plus premedication before the drip even starts. Your infusion centre can give you a more specific estimate once your regimen is confirmed. Do not schedule anything important for that afternoon.
Why is premedication given before every infusion, not just the first?
Cetuximab is a protein foreign to the body, and any dose can trigger an infusion reaction, not only the first. The antihistamine given beforehand lowers that risk each time. NCCN guidelines recommend premedication before every dose as standard protocol. Skipping it is not a shortcut — your team will not start the drip without it.
What does an infusion reaction feel like, and what should I do?
Reactions most often happen during or shortly after the first infusion. You may feel sudden flushing, warmth in your face, chest tightness, a racing heart, or difficulty breathing. Tell the nurse immediately — the infusion will be slowed or stopped and medication given. Most reactions are manageable when reported promptly. Nursing staff are trained for this; you do not need to manage it yourself.
Can I drive home after my cetuximab infusion?
Plan to have someone drive you, especially for your first infusion. The premedication includes an antihistamine, which commonly causes drowsiness. If you have no one available, let your infusion centre know in advance — they can advise on what is possible. Do not plan to drive yourself home from the first visit.
My skin has become red and spotty since starting cetuximab. Should I be worried?
An acneiform rash on the face, scalp, chest, or back is a very common and expected response to cetuximab. It is caused by the drug's effect on EGFR in skin cells, not by an allergy. Mention it at your next visit and start gentle skincare early — regular moisturising and avoiding harsh products helps significantly. If the rash becomes painful, weeping, infected, or very widespread, call your team the same day rather than waiting for your scheduled appointment.