Written by:
Dr. Sophie Reynolds
Dr. Sophie Reynolds is a board-certified medical doctor specializing in internal medicine. With over a decade of experience in patient care and medical writing
Palnat 125 mg Capsule
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Description
Palnat 125 mg Capsule contains Palbociclib, a CDK4/6 inhibitor used in combination with hormonal therapies for the treatment of HR-positive, HER2-negative advanced or metastatic breast cancer. It slows cancer cell growth and improves progression-free survival in eligible patients. Palnat is an oral targeted therapy prescribed under oncologist supervision.
Benefits
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Prolongs progression-free survival significantly
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Oral tablet allows convenient home-based treatment
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Enhances effectiveness of hormone therapies
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Delays need for chemotherapy
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Well-studied in first-line and second-line settings
Indications and Usage
Palnat is indicated for the treatment of:
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Hormone Receptor–positive (HR+), HER2–negative:
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Advanced or metastatic breast cancer
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In combination with:
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Letrozole as initial endocrine-based therapy in postmenopausal women
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Fulvestrant in patients with disease progression after hormone therapy
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Must be used under strict oncologist supervision with routine blood monitoring.
How it Works
Palbociclib selectively inhibits CDK4 and CDK6, proteins responsible for promoting cell division in hormone-sensitive breast cancers. By blocking these, it halts the cancer cell cycle, slowing tumor growth and enhancing the effect of hormone therapies.
Dosage & Administration
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Typical dose: 125 mg once daily for 21 days, followed by 7 days off (28-day cycle)
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Should be taken with food at the same time every day
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Swallow the capsule whole — do not open, crush, or chew
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Continue endocrine therapy (letrozole or fulvestrant) as advised
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Regular blood tests are required to monitor white cell counts and liver function
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Dose may be adjusted based on side effects or blood test results
Side Effects
Common side effects:
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Low white blood cell count (neutropenia)
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Infections
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Fatigue
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Nausea
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Diarrhea
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Hair thinning
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Mouth sores
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Anemia
Serious side effects:
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Febrile neutropenia (fever with low WBCs)
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Severe infections
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Lung inflammation (rare)
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Liver enzyme elevation
Warning and Precaution
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Not safe during pregnancy or breastfeeding
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May suppress immunity — avoid contact with infections
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Use contraception during and for 3 weeks after last dose (women), 14 weeks (men)
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Monitor for signs of lung inflammation, bleeding, or fatigue
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Avoid grapefruit and grapefruit juice
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Inform your doctor about all ongoing medications
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