Pertuzumab is a targeted antibody therapy for HER2-positive breast cancer, given by infusion in a clinical setting. This Pertuzumab HER2 breast cancer guide explains what it treats and what to expect around each infusion.
What Is It?
Pertuzumab is a monoclonal antibody that targets the HER2 protein on cancer cells, used together with trastuzumab and chemotherapy for HER2-positive breast cancer, in early-stage, locally advanced, or metastatic settings.
How Does It Work?
It binds to a different part of the HER2 receptor than trastuzumab, blocking HER2 from pairing with other receptors that drive cancer cell growth, giving a more complete blockade when the two antibodies are used together.
Who Is It Prescribed For?
Adults with HER2-positive breast cancer, prescribed by an oncologist as part of a combination regimen.
Dosage and How to Take It
Given only by a qualified healthcare professional as an intravenous infusion, typically every three weeks, with a higher loading dose at the first infusion followed by a standard maintenance dose thereafter. There is no patient self-dosing schedule.
What If I Miss a Dose?
Infusion appointments are scheduled by your oncology team; contact the clinic promptly to reschedule if you are unable to attend, delays can affect treatment timing.
Common Side Effects
Diarrhoea
Fatigue
Nausea
Rash
Hair loss (usually from the chemotherapy given alongside it)
Serious Side Effects, Seek Help If You Notice:
Signs of heart problems, such as shortness of breath, swelling of the legs, or a significant drop in heart pumping function (monitored by regular heart scans)
Infusion reactions, fever, chills, or breathing difficulty during or shortly after infusion
Signs of low white blood cell count combined with fever
Warnings and Precautions
Pertuzumab can affect heart function, so heart function (ejection fraction) is checked regularly before and during treatment. It is not safe during pregnancy and can cause harm to a developing baby; effective contraception is required during treatment and for a period afterward.
Drug and Food Interactions
As an infusion-only medicine given alongside other cancer therapies, interaction management is handled directly by your oncology team; always disclose all medicines and supplements you take.
Storage
Must be stored and handled under refrigeration (2–8°C) by a licensed pharmacy or clinic, protected from light, and never frozen. HubPharm coordinates cold-chain delivery directly to the administering facility; this is not a home-storage medicine.
Frequently Asked Questions
Why do I need heart scans during treatment? Pertuzumab and trastuzumab can occasionally affect how well the heart pumps, so your team monitors this regularly to catch any change early.
How long does each infusion take? The first infusion is longer due to the loading dose and observation period; later infusions are typically shorter once your care team confirms you tolerate it well.
This article is reviewed by Pharmacist Sesan Kareem, B.Pharm, MPA, MBA and is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always take medicines exactly as prescribed by your doctor. Chat with a HubPharm pharmacist on WhatsApp with any questions before starting, stopping, or changing a medicine.
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