How do you take Palbociclib?

The usual dose is one 125 mg capsule taken once daily with food for 21 days in a row, followed by 7 days off (no drug). This makes one complete 28-day cycle. Always take it with food as it helps your body absorb the medicine properly. Swallow the capsule whole — do not crush, chew, or open it. Your oncologist (cancer doctor) will tell you how many cycles you need.

What are the side effects of Palbociclib?

Low blood cell counts (which can make you feel very tired or catch infections easily), feeling weak or exhausted, nausea or loss of appetite, mouth sores, and hair thinning or hair loss

Who should not take Palbociclib?

People who are allergic to palbociclib or any ingredient in Ibrance capsules, pregnant or breastfeeding women, children, and people with severe liver problems should not take this drug without specialist guidance.

Prescription

CDK4/6 Inhibitor (Cancer medicine / Anticancer agent)

Palbociclib

Q: What is Palbociclib used for?

Advanced breast cancer, hormone receptor-positive (HR-positive) breast cancer that has spread to other parts of the body

Last reviewed June 2026

Who is this for?

What is this drug?

Palbociclib (sold as Ibrance in Nigeria) is a cancer medicine that works by blocking certain proteins called CDK4 and CDK6 that help cancer cells grow and multiply, essentially slowing down or stopping breast cancer growth.

What is it used for?

Advanced breast cancerhormone receptor-positive (HR-positive) breast cancer that has spread to other parts of the body

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Cancer Treatment

How it works

Inhibits cyclin-dependent kinases 4 and 6 (CDK4/6), preventing phosphorylation of the retinoblastoma protein and arresting the cell cycle in G1 phase, thereby suppressing proliferation of hormone receptor-positive breast cancer cells.

Prescription Required

You need a doctor's prescription to buy this drug.

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What to watch out for

This is a very specialized cancer drug — only take it if prescribed and monitored by a qualified oncologist. You will need regular blood tests (especially to check your blood cell counts) throughout treatment, so do not skip your hospital appointments. Only buy Ibrance from verified, licensed pharmacies — counterfeit cancer drugs are dangerous and can cost you your life.

Common Side Effects

Low blood cell counts (which can make you feel very tired or catch infections easily)
feeling weak or exhausted
nausea or loss of appetite
mouth sores
and hair thinning or hair loss

Serious Side Effects

Severe infections with high fever
chills
or body pain — this could mean your white blood cells are dangerously low. Unusual bleeding or bruising that does not stop. Severe breathing difficulty or chest pain. Rush to the hospital immediately if you notice any of these.

Drug Interactions

Avoid grapefruit and grapefruit juice as they can increase the drug level in your blood and worsen side effects. Strong herbal remedies and supplements, especially St. John's wort, can reduce how well the drug works. Some antibiotics and antifungal medicines (like ketoconazole or clarithromycin) can dangerously increase palbociclib levels — always tell your cancer doctor about every medicine you are taking.

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Pregnancy & Breastfeeding Warning

Palbociclib is NOT safe during pregnancy or breastfeeding — it can seriously harm an unborn baby, so women must use effective contraception during treatment and for at least 3 weeks after the last dose.

Who Should NOT Take This

People who are allergic to palbociclib or any ingredient in Ibrance capsules
pregnant or breastfeeding women
children
and people with severe liver problems should not take this drug without specialist guidance.

How to Store

Store at room temperature, away from direct sunlight and excessive heat. Keep in a cool, dry place since Nigerian humidity can damage capsules. Always keep it far out of reach of children and never share it with anyone.

For information only — not medical advice. Always talk to a doctor or pharmacist before changing your medication.